Release v0.9.2: Fix service pool ICE candidate collection

Fixed critical timing issue where ICE candidates were generated before
the handler was attached, causing them to be lost:

- Set up onicecandidate handler BEFORE setLocalDescription()
- Collect candidates in array while waiting for offer ID
- Send all pending candidates once offer ID is available
- Add detailed logging for service pool ICE candidates
- Log candidate type (host/srflx/relay) for debugging

This ensures all ICE candidates are captured and sent to the signaling
server, and provides visibility into what types of candidates are being
generated (especially important for diagnosing TURN relay issues).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

MIGRATION.md

@@ -0,0 +1,547 @@
+# Migration Guide: v0.8.x → v0.9.0
+
+This guide helps you migrate from Rondevu Client v0.8.x to v0.9.0.
+
+## Overview
+
+v0.9.0 is a **breaking change** that completely replaces low-level APIs with high-level durable connections featuring automatic reconnection and message queuing.
+
+### What's New
+
+✅ **Durable Connections**: Automatic reconnection on network drops
+✅ **Message Queuing**: Messages sent during disconnections are queued and flushed on reconnect
+✅ **Durable Channels**: RTCDataChannel wrappers that survive connection drops
+✅ **TTL Auto-Refresh**: Services automatically republish before expiration
+✅ **Simplified API**: Direct methods on main client instead of nested APIs
+
+### What's Removed
+
+❌ **Low-level APIs**: `client.services.*`, `client.discovery.*`, `client.createPeer()` no longer exported
+❌ **Manual Connection Management**: No need to handle WebRTC peer lifecycle manually
+❌ **Service Handles**: Replaced with DurableService instances
+
+## Breaking Changes
+
+### 1. Service Exposure
+
+#### v0.8.x (Old)
+```typescript
+import { Rondevu } from '@xtr-dev/rondevu-client';
+
+const client = new Rondevu();
+await client.register();
+
+const handle = await client.services.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'chat@1.0.0',
+  isPublic: true,
+  handler: (channel, peer) => {
+    channel.onmessage = (e) => {
+      console.log('Received:', e.data);
+      channel.send(`Echo: ${e.data}`);
+    };
+  }
+});
+
+// Unpublish
+await handle.unpublish();
+```
+
+#### v0.9.0 (New)
+```typescript
+import { Rondevu } from '@xtr-dev/rondevu-client';
+
+const client = new Rondevu();
+await client.register();
+
+const service = await client.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'chat@1.0.0',
+  isPublic: true,
+  poolSize: 10,  // NEW: Handle multiple concurrent connections
+  handler: (channel, connectionId) => {
+    // NEW: DurableChannel with event emitters
+    channel.on('message', (data) => {
+      console.log('Received:', data);
+      channel.send(`Echo: ${data}`);
+    });
+  }
+});
+
+// NEW: Start the service
+await service.start();
+
+// NEW: Stop the service
+await service.stop();
+```
+
+**Key Differences:**
+- `client.services.exposeService()` → `client.exposeService()`
+- Returns `DurableService` instead of `ServiceHandle`
+- Handler receives `DurableChannel` instead of `RTCDataChannel`
+- Handler receives `connectionId` string instead of `RondevuPeer`
+- DurableChannel uses `.on('message', ...)` instead of `.onmessage = ...`
+- Must call `service.start()` to begin accepting connections
+- Use `service.stop()` instead of `handle.unpublish()`
+
+### 2. Connecting to Services
+
+#### v0.8.x (Old)
+```typescript
+// Connect by username + FQN
+const { peer, channel } = await client.discovery.connect(
+  'alice',
+  'chat@1.0.0'
+);
+
+channel.onmessage = (e) => {
+  console.log('Received:', e.data);
+};
+
+channel.onopen = () => {
+  channel.send('Hello!');
+};
+
+peer.on('connected', () => {
+  console.log('Connected');
+});
+
+peer.on('failed', (error) => {
+  console.error('Failed:', error);
+});
+```
+
+#### v0.9.0 (New)
+```typescript
+// Connect by username + FQN
+const connection = await client.connect('alice', 'chat@1.0.0', {
+  maxReconnectAttempts: 10  // NEW: Configurable reconnection
+});
+
+// NEW: Create durable channel
+const channel = connection.createChannel('main');
+
+channel.on('message', (data) => {
+  console.log('Received:', data);
+});
+
+channel.on('open', () => {
+  channel.send('Hello!');
+});
+
+// NEW: Connection lifecycle events
+connection.on('connected', () => {
+  console.log('Connected');
+});
+
+connection.on('reconnecting', (attempt, max, delay) => {
+  console.log(`Reconnecting (${attempt}/${max})...`);
+});
+
+connection.on('failed', (error) => {
+  console.error('Failed permanently:', error);
+});
+
+// NEW: Must explicitly connect
+await connection.connect();
+```
+
+**Key Differences:**
+- `client.discovery.connect()` → `client.connect()`
+- Returns `DurableConnection` instead of `{ peer, channel }`
+- Must create channels with `connection.createChannel()`
+- Must call `connection.connect()` to establish connection
+- Automatic reconnection with configurable retry limits
+- Messages sent during disconnection are automatically queued
+
+### 3. Connecting by UUID
+
+#### v0.8.x (Old)
+```typescript
+const { peer, channel } = await client.discovery.connectByUuid('service-uuid');
+
+channel.onmessage = (e) => {
+  console.log('Received:', e.data);
+};
+```
+
+#### v0.9.0 (New)
+```typescript
+const connection = await client.connectByUuid('service-uuid', {
+  maxReconnectAttempts: 5
+});
+
+const channel = connection.createChannel('main');
+
+channel.on('message', (data) => {
+  console.log('Received:', data);
+});
+
+await connection.connect();
+```
+
+**Key Differences:**
+- `client.discovery.connectByUuid()` → `client.connectByUuid()`
+- Returns `DurableConnection` instead of `{ peer, channel }`
+- Must create channels and connect explicitly
+
+### 4. Multi-Connection Services (Offer Pooling)
+
+#### v0.8.x (Old)
+```typescript
+const handle = await client.services.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'chat@1.0.0',
+  poolSize: 5,
+  pollingInterval: 2000,
+  handler: (channel, peer, connectionId) => {
+    console.log(`Connection: ${connectionId}`);
+  },
+  onPoolStatus: (status) => {
+    console.log('Pool status:', status);
+  }
+});
+
+const status = handle.getStatus();
+await handle.addOffers(3);
+```
+
+#### v0.9.0 (New)
+```typescript
+const service = await client.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'chat@1.0.0',
+  poolSize: 5,          // SAME: Pool size
+  pollingInterval: 2000, // SAME: Polling interval
+  handler: (channel, connectionId) => {
+    console.log(`Connection: ${connectionId}`);
+  }
+});
+
+await service.start();
+
+// Get active connections
+const connections = service.getActiveConnections();
+
+// Listen for connection events
+service.on('connection', (connectionId) => {
+  console.log('New connection:', connectionId);
+});
+```
+
+**Key Differences:**
+- `onPoolStatus` callback removed (use `service.on('connection')` instead)
+- `handle.getStatus()` replaced with `service.getActiveConnections()`
+- `handle.addOffers()` removed (pool auto-manages offers)
+- Handler receives `DurableChannel` instead of `RTCDataChannel`
+
+## Feature Comparison
+
+| Feature | v0.8.x | v0.9.0 |
+|---------|--------|--------|
+| Service exposure | `client.services.exposeService()` | `client.exposeService()` |
+| Connection | `client.discovery.connect()` | `client.connect()` |
+| Connection by UUID | `client.discovery.connectByUuid()` | `client.connectByUuid()` |
+| Channel type | `RTCDataChannel` | `DurableChannel` |
+| Event handling | `.onmessage`, `.onopen`, etc. | `.on('message')`, `.on('open')`, etc. |
+| Automatic reconnection | ❌ No | ✅ Yes (configurable) |
+| Message queuing | ❌ No | ✅ Yes (during disconnections) |
+| TTL auto-refresh | ❌ No | ✅ Yes (configurable) |
+| Peer lifecycle | Manual | Automatic |
+| Connection pooling | ✅ Yes | ✅ Yes (same API) |
+
+## API Mapping
+
+### Removed Exports
+
+These are no longer exported in v0.9.0:
+
+```typescript
+// ❌ Removed
+import {
+  RondevuServices,
+  RondevuDiscovery,
+  RondevuPeer,
+  ServiceHandle,
+  PooledServiceHandle,
+  ConnectResult
+} from '@xtr-dev/rondevu-client';
+```
+
+### New Exports
+
+These are new in v0.9.0:
+
+```typescript
+// ✅ New
+import {
+  DurableConnection,
+  DurableChannel,
+  DurableService,
+  DurableConnectionState,
+  DurableChannelState,
+  DurableConnectionConfig,
+  DurableChannelConfig,
+  DurableServiceConfig,
+  DurableConnectionEvents,
+  DurableChannelEvents,
+  DurableServiceEvents,
+  ConnectionInfo,
+  ServiceInfo,
+  QueuedMessage
+} from '@xtr-dev/rondevu-client';
+```
+
+### Unchanged Exports
+
+These work the same in both versions:
+
+```typescript
+// ✅ Unchanged
+import {
+  Rondevu,
+  RondevuAuth,
+  RondevuUsername,
+  Credentials,
+  UsernameClaimResult,
+  UsernameCheckResult
+} from '@xtr-dev/rondevu-client';
+```
+
+## Configuration Options
+
+### New Connection Options
+
+v0.9.0 adds extensive configuration for automatic reconnection and message queuing:
+
+```typescript
+const connection = await client.connect('alice', 'chat@1.0.0', {
+  // Reconnection
+  maxReconnectAttempts: 10,      // default: 10
+  reconnectBackoffBase: 1000,    // default: 1000ms
+  reconnectBackoffMax: 30000,    // default: 30000ms (30 seconds)
+  reconnectJitter: 0.2,          // default: 0.2 (±20%)
+  connectionTimeout: 30000,      // default: 30000ms
+
+  // Message queuing
+  maxQueueSize: 1000,            // default: 1000 messages
+  maxMessageAge: 60000,          // default: 60000ms (1 minute)
+
+  // WebRTC
+  rtcConfig: {
+    iceServers: [...]
+  }
+});
+```
+
+### New Service Options
+
+Services can now auto-refresh TTL:
+
+```typescript
+const service = await client.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'chat@1.0.0',
+
+  // TTL auto-refresh (NEW)
+  ttl: 300000,              // default: 300000ms (5 minutes)
+  ttlRefreshMargin: 0.2,    // default: 0.2 (refresh at 80% of TTL)
+
+  // All connection options also apply to incoming connections
+  maxReconnectAttempts: 10,
+  maxQueueSize: 1000,
+  // ...
+});
+```
+
+## Migration Checklist
+
+- [ ] Replace `client.services.exposeService()` with `client.exposeService()`
+- [ ] Add `await service.start()` after creating service
+- [ ] Replace `handle.unpublish()` with `service.stop()`
+- [ ] Replace `client.discovery.connect()` with `client.connect()`
+- [ ] Replace `client.discovery.connectByUuid()` with `client.connectByUuid()`
+- [ ] Create channels with `connection.createChannel()` instead of receiving them directly
+- [ ] Add `await connection.connect()` to establish connection
+- [ ] Update handlers from `(channel, peer, connectionId?)` to `(channel, connectionId)`
+- [ ] Replace `.onmessage` with `.on('message', ...)`
+- [ ] Replace `.onopen` with `.on('open', ...)`
+- [ ] Replace `.onclose` with `.on('close', ...)`
+- [ ] Replace `.onerror` with `.on('error', ...)`
+- [ ] Add reconnection event handlers (`connection.on('reconnecting', ...)`)
+- [ ] Review and configure reconnection options if needed
+- [ ] Review and configure message queue limits if needed
+- [ ] Update TypeScript imports to use new types
+- [ ] Test automatic reconnection behavior
+- [ ] Test message queuing during disconnections
+
+## Common Migration Patterns
+
+### Pattern 1: Simple Echo Service
+
+#### Before (v0.8.x)
+```typescript
+await client.services.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'echo@1.0.0',
+  handler: (channel) => {
+    channel.onmessage = (e) => {
+      channel.send(`Echo: ${e.data}`);
+    };
+  }
+});
+```
+
+#### After (v0.9.0)
+```typescript
+const service = await client.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'echo@1.0.0',
+  handler: (channel) => {
+    channel.on('message', (data) => {
+      channel.send(`Echo: ${data}`);
+    });
+  }
+});
+
+await service.start();
+```
+
+### Pattern 2: Connection with Error Handling
+
+#### Before (v0.8.x)
+```typescript
+try {
+  const { peer, channel } = await client.discovery.connect('alice', 'chat@1.0.0');
+
+  channel.onopen = () => {
+    channel.send('Hello!');
+  };
+
+  peer.on('failed', (error) => {
+    console.error('Connection failed:', error);
+    // Manual reconnection logic here
+  });
+} catch (error) {
+  console.error('Failed to connect:', error);
+}
+```
+
+#### After (v0.9.0)
+```typescript
+const connection = await client.connect('alice', 'chat@1.0.0', {
+  maxReconnectAttempts: 5
+});
+
+const channel = connection.createChannel('main');
+
+channel.on('open', () => {
+  channel.send('Hello!');
+});
+
+connection.on('reconnecting', (attempt, max, delay) => {
+  console.log(`Reconnecting (${attempt}/${max}) in ${delay}ms`);
+});
+
+connection.on('failed', (error) => {
+  console.error('Connection failed permanently:', error);
+});
+
+try {
+  await connection.connect();
+} catch (error) {
+  console.error('Initial connection failed:', error);
+}
+```
+
+### Pattern 3: Multi-User Chat Server
+
+#### Before (v0.8.x)
+```typescript
+const connections = new Map();
+
+await client.services.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'chat@1.0.0',
+  poolSize: 10,
+  handler: (channel, peer, connectionId) => {
+    connections.set(connectionId, channel);
+
+    channel.onmessage = (e) => {
+      // Broadcast to all
+      for (const [id, ch] of connections) {
+        if (id !== connectionId) {
+          ch.send(e.data);
+        }
+      }
+    };
+
+    channel.onclose = () => {
+      connections.delete(connectionId);
+    };
+  }
+});
+```
+
+#### After (v0.9.0)
+```typescript
+const channels = new Map();
+
+const service = await client.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'chat@1.0.0',
+  poolSize: 10,
+  handler: (channel, connectionId) => {
+    channels.set(connectionId, channel);
+
+    channel.on('message', (data) => {
+      // Broadcast to all
+      for (const [id, ch] of channels) {
+        if (id !== connectionId) {
+          ch.send(data);
+        }
+      }
+    });
+
+    channel.on('close', () => {
+      channels.delete(connectionId);
+    });
+  }
+});
+
+await service.start();
+
+// Optional: Track connections
+service.on('connection', (connectionId) => {
+  console.log(`User ${connectionId} joined`);
+});
+
+service.on('disconnection', (connectionId) => {
+  console.log(`User ${connectionId} left`);
+});
+```
+
+## Benefits of Migration
+
+1. **Reliability**: Automatic reconnection handles network hiccups transparently
+2. **Simplicity**: No need to manage WebRTC peer lifecycle manually
+3. **Durability**: Messages sent during disconnections are queued and delivered when connection restores
+4. **Uptime**: Services automatically refresh TTL before expiration
+5. **Type Safety**: Better TypeScript types with DurableChannel event emitters
+6. **Debugging**: Queue size monitoring, connection state tracking, and detailed events
+
+## Getting Help
+
+If you encounter issues during migration:
+1. Check the [README](./README.md) for complete API documentation
+2. Review the examples for common patterns
+3. Open an issue on [GitHub](https://github.com/xtr-dev/rondevu-client/issues)

README.md

@@ -1,82 +1,659 @@
-# Rondevu
-
-🎯 **Simple WebRTC peer signaling and discovery**
-
-Meet peers by topic, by peer ID, or by connection ID.
-
-**Related repositories:**
-- [rondevu-server](https://github.com/xtr-dev/rondevu-server) - HTTP signaling server
-- [rondevu-demo](https://github.com/xtr-dev/rondevu-demo) - Interactive demo
-
----
-
-## @xtr-dev/rondevu-client
+# Rondevu Client
 
 [![npm version](https://img.shields.io/npm/v/@xtr-dev/rondevu-client)](https://www.npmjs.com/package/@xtr-dev/rondevu-client)
 
-TypeScript client library for Rondevu peer signaling and WebRTC connection management. Handles automatic signaling, ICE candidate exchange, and connection establishment.
+🌐 **WebRTC with durable connections and automatic reconnection**
 
-### Install
+TypeScript/JavaScript client for Rondevu, providing durable WebRTC connections that survive network interruptions with automatic reconnection and message queuing.
+
+**Related repositories:**
+- [@xtr-dev/rondevu-client](https://github.com/xtr-dev/rondevu-client) - TypeScript client library ([npm](https://www.npmjs.com/package/@xtr-dev/rondevu-client))
+- [@xtr-dev/rondevu-server](https://github.com/xtr-dev/rondevu-server) - HTTP signaling server ([npm](https://www.npmjs.com/package/@xtr-dev/rondevu-server), [live](https://api.ronde.vu))
+- [@xtr-dev/rondevu-demo](https://github.com/xtr-dev/rondevu-demo) - Interactive demo ([live](https://ronde.vu))
+
+---
+
+## Features
+
+- **Durable Connections**: Automatic reconnection on network drops
+- **Message Queuing**: Messages sent during disconnections are queued and flushed on reconnect
+- **Durable Channels**: RTCDataChannel wrappers that survive connection drops
+- **TTL Auto-Refresh**: Services automatically republish before expiration
+- **Username Claiming**: Cryptographic ownership with Ed25519 signatures
+- **Service Publishing**: Package-style naming (com.example.chat@1.0.0)
+- **TypeScript**: Full type safety and autocomplete
+- **Configurable**: All timeouts, retry limits, and queue sizes are configurable
+
+## Install
 
 ```bash
 npm install @xtr-dev/rondevu-client
 ```
 
-### Usage
+## Quick Start
+
+### Publishing a Service (Alice)
 
 ```typescript
 import { Rondevu } from '@xtr-dev/rondevu-client';
 
-const rdv = new Rondevu({ 
-  baseUrl: 'https://server.com',
+// Initialize client and register
+const client = new Rondevu({ baseUrl: 'https://api.ronde.vu' });
+await client.register();
+
+// Step 1: Claim username (one-time)
+const claim = await client.usernames.claimUsername('alice');
+client.usernames.saveKeypairToStorage('alice', claim.publicKey, claim.privateKey);
+
+// Step 2: Expose service with handler
+const keypair = client.usernames.loadKeypairFromStorage('alice');
+
+const service = await client.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'chat@1.0.0',
+  isPublic: true,
+  poolSize: 10,  // Handle 10 concurrent connections
+  handler: (channel, connectionId) => {
+    console.log(`📡 New connection: ${connectionId}`);
+
+    channel.on('message', (data) => {
+      console.log('📥 Received:', data);
+      channel.send(`Echo: ${data}`);
+    });
+
+    channel.on('close', () => {
+      console.log(`👋 Connection ${connectionId} closed`);
+    });
+  }
+});
+
+// Start the service
+const info = await service.start();
+console.log(`Service published with UUID: ${info.uuid}`);
+console.log('Waiting for connections...');
+
+// Later: stop the service
+await service.stop();
+```
+
+### Connecting to a Service (Bob)
+
+```typescript
+import { Rondevu } from '@xtr-dev/rondevu-client';
+
+// Initialize client and register
+const client = new Rondevu({ baseUrl: 'https://api.ronde.vu' });
+await client.register();
+
+// Connect to Alice's service
+const connection = await client.connect('alice', 'chat@1.0.0', {
+  maxReconnectAttempts: 5
+});
+
+// Create a durable channel
+const channel = connection.createChannel('main');
+
+channel.on('message', (data) => {
+  console.log('📥 Received:', data);
+});
+
+channel.on('open', () => {
+  console.log('✅ Channel open');
+  channel.send('Hello Alice!');
+});
+
+// Listen for connection events
+connection.on('connected', () => {
+  console.log('🎉 Connected to Alice');
+});
+
+connection.on('reconnecting', (attempt, max, delay) => {
+  console.log(`🔄 Reconnecting... (${attempt}/${max}, retry in ${delay}ms)`);
+});
+
+connection.on('disconnected', () => {
+  console.log('🔌 Disconnected');
+});
+
+connection.on('failed', (error) => {
+  console.error('❌ Connection failed permanently:', error);
+});
+
+// Establish the connection
+await connection.connect();
+
+// Messages sent during disconnection are automatically queued
+channel.send('This will be queued if disconnected');
+
+// Later: close the connection
+await connection.close();
+```
+
+## Core Concepts
+
+### DurableConnection
+
+Manages WebRTC peer lifecycle with automatic reconnection:
+- Automatically reconnects when connection drops
+- Exponential backoff with jitter (1s → 2s → 4s → 8s → ... max 30s)
+- Configurable max retry attempts (default: 10)
+- Manages multiple DurableChannel instances
+
+### DurableChannel
+
+Wraps RTCDataChannel with message queuing:
+- Queues messages during disconnection
+- Flushes queue on reconnection
+- Configurable queue size and message age limits
+- RTCDataChannel-compatible API with event emitters
+
+### DurableService
+
+Server-side service with TTL auto-refresh:
+- Automatically republishes service before TTL expires
+- Creates DurableConnection for each incoming peer
+- Manages connection pool for multiple simultaneous connections
+
+## API Reference
+
+### Main Client
+
+```typescript
+const client = new Rondevu({
+  baseUrl: 'https://api.ronde.vu',  // optional, default shown
+  credentials?: { peerId, secret },  // optional, skip registration
+  fetch?: customFetch,               // optional, for Node.js < 18
+  RTCPeerConnection?: RTCPeerConnection,  // optional, for Node.js
+  RTCSessionDescription?: RTCSessionDescription,
+  RTCIceCandidate?: RTCIceCandidate
+});
+
+// Register and get credentials
+const creds = await client.register();
+// { peerId: '...', secret: '...' }
+
+// Check if authenticated
+client.isAuthenticated(); // boolean
+
+// Get current credentials
+client.getCredentials(); // { peerId, secret } | undefined
+```
+
+### Username API
+
+```typescript
+// Check username availability
+const check = await client.usernames.checkUsername('alice');
+// { available: true } or { available: false, expiresAt: number, publicKey: string }
+
+// Claim username with new keypair
+const claim = await client.usernames.claimUsername('alice');
+// { username, publicKey, privateKey, claimedAt, expiresAt }
+
+// Save keypair to localStorage
+client.usernames.saveKeypairToStorage('alice', claim.publicKey, claim.privateKey);
+
+// Load keypair from localStorage
+const keypair = client.usernames.loadKeypairFromStorage('alice');
+// { publicKey, privateKey } | null
+```
+
+**Username Rules:**
+- Format: Lowercase alphanumeric + dash (`a-z`, `0-9`, `-`)
+- Length: 3-32 characters
+- Pattern: `^[a-z0-9][a-z0-9-]*[a-z0-9]$`
+- Validity: 365 days from claim/last use
+- Ownership: Secured by Ed25519 public key
+
+### Durable Service API
+
+```typescript
+// Expose a durable service
+const service = await client.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'chat@1.0.0',
+
+  // Service options
+  isPublic: true,               // optional, default: false
+  metadata: { version: '1.0' }, // optional
+  ttl: 300000,                  // optional, default: 5 minutes
+  ttlRefreshMargin: 0.2,        // optional, refresh at 80% of TTL
+
+  // Connection pooling
+  poolSize: 10,                 // optional, default: 1
+  pollingInterval: 2000,        // optional, default: 2000ms
+
+  // Connection options (applied to incoming connections)
+  maxReconnectAttempts: 10,     // optional, default: 10
+  reconnectBackoffBase: 1000,   // optional, default: 1000ms
+  reconnectBackoffMax: 30000,   // optional, default: 30000ms
+  reconnectJitter: 0.2,         // optional, default: 0.2 (±20%)
+  connectionTimeout: 30000,     // optional, default: 30000ms
+
+  // Message queuing
+  maxQueueSize: 1000,           // optional, default: 1000
+  maxMessageAge: 60000,         // optional, default: 60000ms (1 minute)
+
+  // WebRTC configuration
   rtcConfig: {
     iceServers: [
-      // your ICE servers here
-      { urls: 'stun:stun.l.google.com:19302' },
-      { urls: 'stun:stun1.l.google.com:19302' },
-      {
-        urls: 'turn:relay1.example.com:3480',
-        username: 'example',
-        credential: 'example'
-      }
+      { urls: 'stun:stun.l.google.com:19302' }
+    ]
+  },
+
+  // Connection handler
+  handler: (channel, connectionId) => {
+    // Handle incoming connection
+    channel.on('message', (data) => {
+      console.log('Received:', data);
+      channel.send(`Echo: ${data}`);
+    });
+  }
+});
+
+// Start the service
+const info = await service.start();
+// { serviceId: '...', uuid: '...', expiresAt: 1234567890 }
+
+// Get active connections
+const connections = service.getActiveConnections();
+// ['conn-123', 'conn-456']
+
+// Get service info
+const serviceInfo = service.getServiceInfo();
+// { serviceId: '...', uuid: '...', expiresAt: 1234567890 } | null
+
+// Stop the service
+await service.stop();
+```
+
+**Service Events:**
+```typescript
+service.on('published', (serviceId, uuid) => {
+  console.log(`Service published: ${uuid}`);
+});
+
+service.on('connection', (connectionId) => {
+  console.log(`New connection: ${connectionId}`);
+});
+
+service.on('disconnection', (connectionId) => {
+  console.log(`Connection closed: ${connectionId}`);
+});
+
+service.on('ttl-refreshed', (expiresAt) => {
+  console.log(`TTL refreshed, expires at: ${new Date(expiresAt)}`);
+});
+
+service.on('error', (error, context) => {
+  console.error(`Service error (${context}):`, error);
+});
+
+service.on('closed', () => {
+  console.log('Service stopped');
+});
+```
+
+### Durable Connection API
+
+```typescript
+// Connect by username and service FQN
+const connection = await client.connect('alice', 'chat@1.0.0', {
+  // Connection options
+  maxReconnectAttempts: 10,     // optional, default: 10
+  reconnectBackoffBase: 1000,   // optional, default: 1000ms
+  reconnectBackoffMax: 30000,   // optional, default: 30000ms
+  reconnectJitter: 0.2,         // optional, default: 0.2 (±20%)
+  connectionTimeout: 30000,     // optional, default: 30000ms
+
+  // Message queuing
+  maxQueueSize: 1000,           // optional, default: 1000
+  maxMessageAge: 60000,         // optional, default: 60000ms
+
+  // WebRTC configuration
+  rtcConfig: {
+    iceServers: [
+      { urls: 'stun:stun.l.google.com:19302' }
     ]
   }
 });
 
-// Connect by topic
-const conn = await rdv.join('room');
+// Connect by UUID
+const connection2 = await client.connectByUuid('service-uuid-here', {
+  maxReconnectAttempts: 5
+});
 
-// Or connect by ID
-const conn = await rdv.connect('meeting-123');
+// Create channels before connecting
+const channel = connection.createChannel('main');
+const fileChannel = connection.createChannel('files', {
+  ordered: false,
+  maxRetransmits: 3
+});
 
-// Use the connection
-conn.on('connect', () => {
-  const channel = conn.dataChannel('chat');
-  channel.send('Hello!');
+// Get existing channel
+const existingChannel = connection.getChannel('main');
+
+// Check connection state
+const state = connection.getState();
+// 'connecting' | 'connected' | 'reconnecting' | 'disconnected' | 'failed' | 'closed'
+
+const isConnected = connection.isConnected();
+
+// Connect
+await connection.connect();
+
+// Close connection
+await connection.close();
+```
+
+**Connection Events:**
+```typescript
+connection.on('state', (newState, previousState) => {
+  console.log(`State: ${previousState} → ${newState}`);
+});
+
+connection.on('connected', () => {
+  console.log('Connected');
+});
+
+connection.on('reconnecting', (attempt, maxAttempts, delay) => {
+  console.log(`Reconnecting (${attempt}/${maxAttempts}) in ${delay}ms`);
+});
+
+connection.on('disconnected', () => {
+  console.log('Disconnected');
+});
+
+connection.on('failed', (error, permanent) => {
+  console.error('Connection failed:', error, 'Permanent:', permanent);
+});
+
+connection.on('closed', () => {
+  console.log('Connection closed');
 });
 ```
 
-### API
+### Durable Channel API
 
-**Main Methods:**
-- `rdv.join(topic)` - Auto-connect to first peer in topic
-- `rdv.join(topic, {filter})` - Connect to specific peer by ID
-- `rdv.create(id, topic)` - Create connection for others to join
-- `rdv.connect(id)` - Join connection by ID
+```typescript
+const channel = connection.createChannel('chat', {
+  ordered: true,          // optional, default: true
+  maxRetransmits: undefined  // optional, for unordered channels
+});
 
-**Connection Events:**
-- `connect` - Connection established
-- `disconnect` - Connection closed
-- `datachannel` - Remote peer created data channel
-- `stream` - Remote media stream received
-- `error` - Error occurred
+// Send data (queued if disconnected)
+channel.send('Hello!');
+channel.send(new ArrayBuffer(1024));
+channel.send(new Blob(['data']));
 
-**Connection Methods:**
-- `conn.dataChannel(label)` - Get or create data channel
-- `conn.addStream(stream)` - Add media stream
-- `conn.getPeerConnection()` - Get underlying RTCPeerConnection
-- `conn.close()` - Close connection
+// Check state
+const state = channel.readyState;
+// 'connecting' | 'open' | 'closing' | 'closed'
 
-### License
+// Get buffered amount
+const buffered = channel.bufferedAmount;
+
+// Set buffered amount low threshold
+channel.bufferedAmountLowThreshold = 16 * 1024; // 16KB
+
+// Get queue size (for debugging)
+const queueSize = channel.getQueueSize();
+
+// Close channel
+channel.close();
+```
+
+**Channel Events:**
+```typescript
+channel.on('open', () => {
+  console.log('Channel open');
+});
+
+channel.on('message', (data) => {
+  console.log('Received:', data);
+});
+
+channel.on('error', (error) => {
+  console.error('Channel error:', error);
+});
+
+channel.on('close', () => {
+  console.log('Channel closed');
+});
+
+channel.on('bufferedAmountLow', () => {
+  console.log('Buffer drained, safe to send more');
+});
+
+channel.on('queueOverflow', (droppedCount) => {
+  console.warn(`Queue overflow: ${droppedCount} messages dropped`);
+});
+```
+
+## Configuration Options
+
+### Connection Configuration
+
+```typescript
+interface DurableConnectionConfig {
+  maxReconnectAttempts?: number;      // default: 10
+  reconnectBackoffBase?: number;      // default: 1000 (1 second)
+  reconnectBackoffMax?: number;       // default: 30000 (30 seconds)
+  reconnectJitter?: number;           // default: 0.2 (±20%)
+  connectionTimeout?: number;         // default: 30000 (30 seconds)
+  maxQueueSize?: number;              // default: 1000 messages
+  maxMessageAge?: number;             // default: 60000 (1 minute)
+  rtcConfig?: RTCConfiguration;
+}
+```
+
+### Service Configuration
+
+```typescript
+interface DurableServiceConfig extends DurableConnectionConfig {
+  username: string;
+  privateKey: string;
+  serviceFqn: string;
+  isPublic?: boolean;                 // default: false
+  metadata?: Record<string, any>;
+  ttl?: number;                       // default: 300000 (5 minutes)
+  ttlRefreshMargin?: number;          // default: 0.2 (refresh at 80%)
+  poolSize?: number;                  // default: 1
+  pollingInterval?: number;           // default: 2000 (2 seconds)
+}
+```
+
+## Examples
+
+### Chat Application
+
+```typescript
+// Server
+const client = new Rondevu();
+await client.register();
+
+const claim = await client.usernames.claimUsername('alice');
+client.usernames.saveKeypairToStorage('alice', claim.publicKey, claim.privateKey);
+const keypair = client.usernames.loadKeypairFromStorage('alice');
+
+const service = await client.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'chat@1.0.0',
+  isPublic: true,
+  poolSize: 50,  // Handle 50 concurrent users
+  handler: (channel, connectionId) => {
+    console.log(`User ${connectionId} joined`);
+
+    channel.on('message', (data) => {
+      console.log(`[${connectionId}]: ${data}`);
+      // Broadcast to all users (implement your broadcast logic)
+    });
+
+    channel.on('close', () => {
+      console.log(`User ${connectionId} left`);
+    });
+  }
+});
+
+await service.start();
+
+// Client
+const client2 = new Rondevu();
+await client2.register();
+
+const connection = await client2.connect('alice', 'chat@1.0.0');
+const channel = connection.createChannel('chat');
+
+channel.on('message', (data) => {
+  console.log('Message:', data);
+});
+
+await connection.connect();
+channel.send('Hello everyone!');
+```
+
+### File Transfer with Progress
+
+```typescript
+// Server
+const service = await client.exposeService({
+  username: 'alice',
+  privateKey: keypair.privateKey,
+  serviceFqn: 'files@1.0.0',
+  handler: (channel, connectionId) => {
+    channel.on('message', async (data) => {
+      const request = JSON.parse(data);
+
+      if (request.action === 'download') {
+        const file = await fs.readFile(request.path);
+        const chunkSize = 16 * 1024; // 16KB chunks
+
+        for (let i = 0; i < file.byteLength; i += chunkSize) {
+          const chunk = file.slice(i, i + chunkSize);
+          channel.send(chunk);
+
+          // Wait for buffer to drain if needed
+          while (channel.bufferedAmount > 16 * 1024 * 1024) { // 16MB
+            await new Promise(resolve => setTimeout(resolve, 100));
+          }
+        }
+
+        channel.send(JSON.stringify({ done: true }));
+      }
+    });
+  }
+});
+
+await service.start();
+
+// Client
+const connection = await client.connect('alice', 'files@1.0.0');
+const channel = connection.createChannel('files');
+
+const chunks = [];
+channel.on('message', (data) => {
+  if (typeof data === 'string') {
+    const msg = JSON.parse(data);
+    if (msg.done) {
+      const blob = new Blob(chunks);
+      console.log('Download complete:', blob.size, 'bytes');
+    }
+  } else {
+    chunks.push(data);
+    console.log('Progress:', chunks.length * 16 * 1024, 'bytes');
+  }
+});
+
+await connection.connect();
+channel.send(JSON.stringify({ action: 'download', path: '/file.zip' }));
+```
+
+## Platform-Specific Setup
+
+### Modern Browsers
+Works out of the box - no additional setup needed.
+
+### Node.js 18+
+Native fetch is available, but you need WebRTC polyfills:
+
+```bash
+npm install wrtc
+```
+
+```typescript
+import { Rondevu } from '@xtr-dev/rondevu-client';
+import { RTCPeerConnection, RTCSessionDescription, RTCIceCandidate } from 'wrtc';
+
+const client = new Rondevu({
+  baseUrl: 'https://api.ronde.vu',
+  RTCPeerConnection,
+  RTCSessionDescription,
+  RTCIceCandidate
+});
+```
+
+### Node.js < 18
+Install both fetch and WebRTC polyfills:
+
+```bash
+npm install node-fetch wrtc
+```
+
+```typescript
+import { Rondevu } from '@xtr-dev/rondevu-client';
+import fetch from 'node-fetch';
+import { RTCPeerConnection, RTCSessionDescription, RTCIceCandidate } from 'wrtc';
+
+const client = new Rondevu({
+  baseUrl: 'https://api.ronde.vu',
+  fetch: fetch as any,
+  RTCPeerConnection,
+  RTCSessionDescription,
+  RTCIceCandidate
+});
+```
+
+## TypeScript
+
+All types are exported:
+
+```typescript
+import type {
+  // Client types
+  Credentials,
+  RondevuOptions,
+
+  // Username types
+  UsernameCheckResult,
+  UsernameClaimResult,
+
+  // Durable connection types
+  DurableConnectionState,
+  DurableChannelState,
+  DurableConnectionConfig,
+  DurableChannelConfig,
+  DurableServiceConfig,
+  QueuedMessage,
+  DurableConnectionEvents,
+  DurableChannelEvents,
+  DurableServiceEvents,
+  ConnectionInfo,
+  ServiceInfo
+} from '@xtr-dev/rondevu-client';
+```
+
+## Migration from v0.8.x
+
+v0.9.0 is a **breaking change** that replaces the low-level APIs with high-level durable connections. See [MIGRATION.md](./MIGRATION.md) for detailed migration guide.
+
+**Key Changes:**
+- ❌ Removed: `client.services.*`, `client.discovery.*`, `client.createPeer()` (low-level APIs)
+- ✅ Added: `client.exposeService()`, `client.connect()`, `client.connectByUuid()` (durable APIs)
+- ✅ Changed: Focus on durable connections with automatic reconnection and message queuing
+
+## License
 
 MIT

package-lock.json

@@ -0,0 +1,49 @@
+{
+  "name": "@xtr-dev/rondevu-client",
+  "version": "0.9.2",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "@xtr-dev/rondevu-client",
+      "version": "0.9.2",
+      "license": "MIT",
+      "dependencies": {
+        "@noble/ed25519": "^3.0.0",
+        "@xtr-dev/rondevu-client": "^0.5.1"
+      },
+      "devDependencies": {
+        "typescript": "^5.9.3"
+      }
+    },
+    "node_modules/@noble/ed25519": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@noble/ed25519/-/ed25519-3.0.0.tgz",
+      "integrity": "sha512-QyteqMNm0GLqfa5SoYbSC3+Pvykwpn95Zgth4MFVSMKBB75ELl9tX1LAVsN4c3HXOrakHsF2gL4zWDAYCcsnzg==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@xtr-dev/rondevu-client": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/@xtr-dev/rondevu-client/-/rondevu-client-0.5.1.tgz",
+      "integrity": "sha512-110ejMCizPUPkHwwwNvcdCSZceLaHeFbf1LNkXvbG6pnLBqCf2uoGOOaRkArb7HNNFABFB+HXzm/AVzNdadosw==",
+      "license": "MIT"
+    },
+    "node_modules/typescript": {
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    }
+  }
+}

package.json

@@ -1,15 +1,14 @@
 {
   "name": "@xtr-dev/rondevu-client",
-  "version": "0.1.1",
-  "description": "TypeScript client for Rondevu peer signaling and discovery server",
+  "version": "0.9.2",
+  "description": "TypeScript client for Rondevu with durable WebRTC connections, automatic reconnection, and message queuing",
   "type": "module",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "scripts": {
     "build": "tsc",
     "typecheck": "tsc --noEmit",
-    "prepublishOnly": "npm run build",
-    "publish": "npm publish"
+    "prepublishOnly": "npm run build"
   },
   "keywords": [
     "webrtc",
@@ -26,5 +25,8 @@
   "files": [
     "dist",
     "README.md"
-  ]
+  ],
+  "dependencies": {
+    "@noble/ed25519": "^3.0.0"
+  }
 }

src/auth.ts

@@ -0,0 +1,62 @@
+export interface Credentials {
+  peerId: string;
+  secret: string;
+}
+
+// Fetch-compatible function type
+export type FetchFunction = (
+  input: RequestInfo | URL,
+  init?: RequestInit
+) => Promise<Response>;
+
+export class RondevuAuth {
+  private fetchFn: FetchFunction;
+
+  constructor(
+    private baseUrl: string,
+    fetchFn?: FetchFunction
+  ) {
+    // Use provided fetch or fall back to global fetch
+    this.fetchFn = fetchFn || ((...args) => {
+      if (typeof globalThis.fetch === 'function') {
+        return globalThis.fetch(...args);
+      }
+      throw new Error(
+        'fetch is not available. Please provide a fetch implementation in the constructor options.'
+      );
+    });
+  }
+
+  /**
+   * Register a new peer and receive credentials
+   * Generates a cryptographically random peer ID (128-bit)
+   * @throws Error if registration fails
+   */
+  async register(): Promise<Credentials> {
+    const response = await this.fetchFn(`${this.baseUrl}/register`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({}),
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ error: 'Unknown error' }));
+      throw new Error(`Registration failed: ${error.error || response.statusText}`);
+    }
+
+    const data = await response.json();
+    return {
+      peerId: data.peerId,
+      secret: data.secret,
+    };
+  }
+
+  /**
+   * Create Authorization header value
+   */
+  static createAuthHeader(credentials: Credentials): string {
+    return `Bearer ${credentials.peerId}:${credentials.secret}`;
+  }
+}

src/client.ts

@@ -1,239 +0,0 @@
-import {
-  RondevuClientOptions,
-  ListTopicsResponse,
-  ListSessionsResponse,
-  CreateOfferRequest,
-  CreateOfferResponse,
-  AnswerRequest,
-  AnswerResponse,
-  PollRequest,
-  PollOffererResponse,
-  PollAnswererResponse,
-  VersionResponse,
-  HealthResponse,
-  ErrorResponse,
-  Side,
-} from './types';
-
-/**
- * HTTP client for Rondevu peer signaling and discovery server
- */
-export class RondevuClient {
-  private readonly baseUrl: string;
-  private readonly fetchImpl: typeof fetch;
-
-  /**
-   * Creates a new Rondevu client instance
-   * @param options - Client configuration options
-   */
-  constructor(options: RondevuClientOptions) {
-    this.baseUrl = options.baseUrl.replace(/\/$/, ''); // Remove trailing slash
-    this.fetchImpl = options.fetch || globalThis.fetch.bind(globalThis);
-  }
-
-  /**
-   * Makes an HTTP request to the Rondevu server
-   */
-  private async request<T>(
-    endpoint: string,
-    options: RequestInit = {}
-  ): Promise<T> {
-    const url = `${this.baseUrl}${endpoint}`;
-
-    const headers: Record<string, string> = {
-      ...(options.headers as Record<string, string>),
-    };
-
-    if (options.body) {
-      headers['Content-Type'] = 'application/json';
-    }
-
-    const response = await this.fetchImpl(url, {
-      ...options,
-      headers,
-    });
-
-    const data = await response.json();
-
-    if (!response.ok) {
-      const error = data as ErrorResponse;
-      throw new Error(error.error || `HTTP ${response.status}: ${response.statusText}`);
-    }
-
-    return data as T;
-  }
-
-  /**
-   * Gets server version information
-   *
-   * @returns Server version (git commit hash)
-   *
-   * @example
-   * ```typescript
-   * const client = new RondevuClient({ baseUrl: 'https://example.com' });
-   * const { version } = await client.getVersion();
-   * console.log('Server version:', version);
-   * ```
-   */
-  async getVersion(): Promise<VersionResponse> {
-    return this.request<VersionResponse>('/', {
-      method: 'GET',
-    });
-  }
-
-  /**
-   * Lists all topics with peer counts
-   *
-   * @param page - Page number (starting from 1)
-   * @param limit - Results per page (max 1000)
-   * @returns List of topics with pagination info
-   *
-   * @example
-   * ```typescript
-   * const client = new RondevuClient({ baseUrl: 'https://example.com' });
-   * const { topics, pagination } = await client.listTopics();
-   * console.log(`Found ${topics.length} topics`);
-   * ```
-   */
-  async listTopics(page = 1, limit = 100): Promise<ListTopicsResponse> {
-    const params = new URLSearchParams({
-      page: page.toString(),
-      limit: limit.toString(),
-    });
-    return this.request<ListTopicsResponse>(`/topics?${params}`, {
-      method: 'GET',
-    });
-  }
-
-  /**
-   * Discovers available peers for a given topic
-   *
-   * @param topic - Topic identifier
-   * @returns List of available sessions
-   *
-   * @example
-   * ```typescript
-   * const client = new RondevuClient({ baseUrl: 'https://example.com' });
-   * const { sessions } = await client.listSessions('my-room');
-   * const otherPeers = sessions.filter(s => s.peerId !== myPeerId);
-   * ```
-   */
-  async listSessions(topic: string): Promise<ListSessionsResponse> {
-    return this.request<ListSessionsResponse>(`/${encodeURIComponent(topic)}/sessions`, {
-      method: 'GET',
-    });
-  }
-
-  /**
-   * Announces peer availability and creates a new session
-   *
-   * @param topic - Topic identifier for grouping peers (max 1024 characters)
-   * @param request - Offer details including peer ID and signaling data
-   * @returns Unique session code (UUID)
-   *
-   * @example
-   * ```typescript
-   * const client = new RondevuClient({ baseUrl: 'https://example.com' });
-   * const { code } = await client.createOffer('my-room', {
-   *   peerId: 'peer-123',
-   *   offer: signalingData
-   * });
-   * console.log('Session code:', code);
-   * ```
-   */
-  async createOffer(
-    topic: string,
-    request: CreateOfferRequest
-  ): Promise<CreateOfferResponse> {
-    return this.request<CreateOfferResponse>(
-      `/${encodeURIComponent(topic)}/offer`,
-      {
-        method: 'POST',
-        body: JSON.stringify(request),
-      }
-    );
-  }
-
-  /**
-   * Sends an answer or candidate to an existing session
-   *
-   * @param request - Answer details including session code and signaling data
-   * @returns Success confirmation
-   *
-   * @example
-   * ```typescript
-   * const client = new RondevuClient({ baseUrl: 'https://example.com' });
-   *
-   * // Send answer
-   * await client.sendAnswer({
-   *   code: sessionCode,
-   *   answer: answerData,
-   *   side: 'answerer'
-   * });
-   *
-   * // Send candidate
-   * await client.sendAnswer({
-   *   code: sessionCode,
-   *   candidate: candidateData,
-   *   side: 'offerer'
-   * });
-   * ```
-   */
-  async sendAnswer(request: AnswerRequest): Promise<AnswerResponse> {
-    return this.request<AnswerResponse>('/answer', {
-      method: 'POST',
-      body: JSON.stringify(request),
-    });
-  }
-
-  /**
-   * Polls for session data from the other peer
-   *
-   * @param code - Session UUID
-   * @param side - Which side is polling ('offerer' or 'answerer')
-   * @returns Session data including offers, answers, and candidates
-   *
-   * @example
-   * ```typescript
-   * const client = new RondevuClient({ baseUrl: 'https://example.com' });
-   *
-   * // Offerer polls for answer
-   * const offererData = await client.poll(sessionCode, 'offerer');
-   * if (offererData.answer) {
-   *   console.log('Received answer:', offererData.answer);
-   * }
-   *
-   * // Answerer polls for offer
-   * const answererData = await client.poll(sessionCode, 'answerer');
-   * console.log('Received offer:', answererData.offer);
-   * ```
-   */
-  async poll(
-    code: string,
-    side: Side
-  ): Promise<PollOffererResponse | PollAnswererResponse> {
-    const request: PollRequest = { code, side };
-    return this.request<PollOffererResponse | PollAnswererResponse>('/poll', {
-      method: 'POST',
-      body: JSON.stringify(request),
-    });
-  }
-
-  /**
-   * Checks server health
-   *
-   * @returns Health status and timestamp
-   *
-   * @example
-   * ```typescript
-   * const client = new RondevuClient({ baseUrl: 'https://example.com' });
-   * const health = await client.health();
-   * console.log('Server status:', health.status);
-   * ```
-   */
-  async health(): Promise<HealthResponse> {
-    return this.request<HealthResponse>('/health', {
-      method: 'GET',
-    });
-  }
-}

src/connection.ts

@@ -1,310 +0,0 @@
-import { EventEmitter } from './event-emitter';
-import { RondevuClient } from './client';
-import { RondevuConnectionParams } from './types';
-
-/**
- * Represents a WebRTC connection with automatic signaling and ICE exchange
- */
-export class RondevuConnection extends EventEmitter {
-  readonly id: string;
-  readonly topic: string;
-  readonly role: 'offerer' | 'answerer';
-  readonly remotePeerId: string;
-
-  private pc: RTCPeerConnection;
-  private client: RondevuClient;
-  private localPeerId: string;
-  private dataChannels: Map<string, RTCDataChannel>;
-  private pollingInterval?: ReturnType<typeof setInterval>;
-  private pollingIntervalMs: number;
-  private connectionTimeoutMs: number;
-  private connectionTimer?: ReturnType<typeof setTimeout>;
-  private isPolling: boolean = false;
-  private isClosed: boolean = false;
-
-  constructor(params: RondevuConnectionParams, client: RondevuClient) {
-    super();
-    this.id = params.id;
-    this.topic = params.topic;
-    this.role = params.role;
-    this.pc = params.pc;
-    this.localPeerId = params.localPeerId;
-    this.remotePeerId = params.remotePeerId;
-    this.client = client;
-    this.dataChannels = new Map();
-    this.pollingIntervalMs = params.pollingInterval;
-    this.connectionTimeoutMs = params.connectionTimeout;
-
-    this.setupEventHandlers();
-    this.startConnectionTimeout();
-  }
-
-  /**
-   * Setup RTCPeerConnection event handlers
-   */
-  private setupEventHandlers(): void {
-    // ICE candidate gathering
-    this.pc.onicecandidate = (event) => {
-      if (event.candidate && !this.isClosed) {
-        this.sendIceCandidate(event.candidate).catch((err) => {
-          this.emit('error', new Error(`Failed to send ICE candidate: ${err.message}`));
-        });
-      }
-    };
-
-    // Connection state changes
-    this.pc.onconnectionstatechange = () => {
-      this.handleConnectionStateChange();
-    };
-
-    // Remote data channels
-    this.pc.ondatachannel = (event) => {
-      this.handleRemoteDataChannel(event.channel);
-    };
-
-    // Remote media streams
-    this.pc.ontrack = (event) => {
-      if (event.streams && event.streams[0]) {
-        this.emit('stream', event.streams[0]);
-      }
-    };
-
-    // ICE connection state changes
-    this.pc.oniceconnectionstatechange = () => {
-      const state = this.pc.iceConnectionState;
-
-      if (state === 'failed' || state === 'closed') {
-        this.emit('error', new Error(`ICE connection ${state}`));
-        if (state === 'failed') {
-          this.close();
-        }
-      }
-    };
-  }
-
-  /**
-   * Handle RTCPeerConnection state changes
-   */
-  private handleConnectionStateChange(): void {
-    const state = this.pc.connectionState;
-
-    switch (state) {
-      case 'connected':
-        this.clearConnectionTimeout();
-        this.stopPolling();
-        this.emit('connect');
-        break;
-
-      case 'disconnected':
-        this.emit('disconnect');
-        break;
-
-      case 'failed':
-        this.emit('error', new Error('Connection failed'));
-        this.close();
-        break;
-
-      case 'closed':
-        this.emit('disconnect');
-        break;
-    }
-  }
-
-  /**
-   * Send an ICE candidate to the remote peer via signaling server
-   */
-  private async sendIceCandidate(candidate: RTCIceCandidate): Promise<void> {
-    try {
-      await this.client.sendAnswer({
-        code: this.id,
-        candidate: JSON.stringify(candidate.toJSON()),
-        side: this.role,
-      });
-    } catch (err: any) {
-      throw new Error(`Failed to send ICE candidate: ${err.message}`);
-    }
-  }
-
-  /**
-   * Start polling for remote session data (answer/candidates)
-   */
-  startPolling(): void {
-    if (this.isPolling || this.isClosed) {
-      return;
-    }
-
-    this.isPolling = true;
-
-    // Poll immediately
-    this.poll().catch((err) => {
-      this.emit('error', new Error(`Poll error: ${err.message}`));
-    });
-
-    // Set up interval polling
-    this.pollingInterval = setInterval(() => {
-      this.poll().catch((err) => {
-        this.emit('error', new Error(`Poll error: ${err.message}`));
-      });
-    }, this.pollingIntervalMs);
-  }
-
-  /**
-   * Stop polling
-   */
-  private stopPolling(): void {
-    this.isPolling = false;
-    if (this.pollingInterval) {
-      clearInterval(this.pollingInterval);
-      this.pollingInterval = undefined;
-    }
-  }
-
-  /**
-   * Poll the signaling server for remote data
-   */
-  private async poll(): Promise<void> {
-    if (this.isClosed) {
-      this.stopPolling();
-      return;
-    }
-
-    try {
-      const response = await this.client.poll(this.id, this.role);
-
-      if (this.role === 'offerer') {
-        const offererResponse = response as { answer: string | null; answerCandidates: string[] };
-
-        // Apply answer if received and not yet applied
-        if (offererResponse.answer && !this.pc.currentRemoteDescription) {
-          await this.pc.setRemoteDescription({
-            type: 'answer',
-            sdp: offererResponse.answer,
-          });
-        }
-
-        // Apply ICE candidates
-        if (offererResponse.answerCandidates && offererResponse.answerCandidates.length > 0) {
-          for (const candidateStr of offererResponse.answerCandidates) {
-            try {
-              const candidate = JSON.parse(candidateStr);
-              await this.pc.addIceCandidate(new RTCIceCandidate(candidate));
-            } catch (err) {
-              console.warn('Failed to add ICE candidate:', err);
-            }
-          }
-        }
-      } else {
-        // Answerer role
-        const answererResponse = response as { offer: string; offerCandidates: string[] };
-
-        // Apply ICE candidates from offerer
-        if (answererResponse.offerCandidates && answererResponse.offerCandidates.length > 0) {
-          for (const candidateStr of answererResponse.offerCandidates) {
-            try {
-              const candidate = JSON.parse(candidateStr);
-              await this.pc.addIceCandidate(new RTCIceCandidate(candidate));
-            } catch (err) {
-              console.warn('Failed to add ICE candidate:', err);
-            }
-          }
-        }
-      }
-    } catch (err: any) {
-      // Session not found or expired
-      if (err.message.includes('404') || err.message.includes('not found')) {
-        this.emit('error', new Error('Session not found or expired'));
-        this.close();
-      }
-      throw err;
-    }
-  }
-
-  /**
-   * Handle remotely created data channel
-   */
-  private handleRemoteDataChannel(channel: RTCDataChannel): void {
-    this.dataChannels.set(channel.label, channel);
-    this.emit('datachannel', channel);
-  }
-
-  /**
-   * Get or create a data channel
-   */
-  dataChannel(label: string, options?: RTCDataChannelInit): RTCDataChannel {
-    let channel = this.dataChannels.get(label);
-
-    if (!channel) {
-      channel = this.pc.createDataChannel(label, options);
-      this.dataChannels.set(label, channel);
-    }
-
-    return channel;
-  }
-
-  /**
-   * Add a local media stream to the connection
-   */
-  addStream(stream: MediaStream): void {
-    stream.getTracks().forEach(track => {
-      this.pc.addTrack(track, stream);
-    });
-  }
-
-  /**
-   * Get the underlying RTCPeerConnection for advanced usage
-   */
-  getPeerConnection(): RTCPeerConnection {
-    return this.pc;
-  }
-
-  /**
-   * Start connection timeout
-   */
-  private startConnectionTimeout(): void {
-    this.connectionTimer = setTimeout(() => {
-      if (this.pc.connectionState !== 'connected') {
-        this.emit('error', new Error('Connection timeout'));
-        this.close();
-      }
-    }, this.connectionTimeoutMs);
-  }
-
-  /**
-   * Clear connection timeout
-   */
-  private clearConnectionTimeout(): void {
-    if (this.connectionTimer) {
-      clearTimeout(this.connectionTimer);
-      this.connectionTimer = undefined;
-    }
-  }
-
-  /**
-   * Close the connection and cleanup resources
-   */
-  close(): void {
-    if (this.isClosed) {
-      return;
-    }
-
-    this.isClosed = true;
-
-    this.stopPolling();
-    this.clearConnectionTimeout();
-
-    // Close all data channels
-    this.dataChannels.forEach(dc => {
-      if (dc.readyState === 'open' || dc.readyState === 'connecting') {
-        dc.close();
-      }
-    });
-    this.dataChannels.clear();
-
-    // Close peer connection
-    if (this.pc.connectionState !== 'closed') {
-      this.pc.close();
-    }
-
-    this.emit('disconnect');
-  }
-}

src/durable/channel.ts

@@ -0,0 +1,361 @@
+/**
+ * DurableChannel - Message queueing wrapper for RTCDataChannel
+ *
+ * Provides automatic message queuing during disconnections and transparent
+ * flushing when the connection is re-established.
+ */
+
+import { EventEmitter } from '../event-emitter.js';
+import {
+  DurableChannelState
+} from './types.js';
+import type {
+  DurableChannelConfig,
+  DurableChannelEvents,
+  QueuedMessage
+} from './types.js';
+
+/**
+ * Default configuration for durable channels
+ */
+const DEFAULT_CONFIG = {
+  maxQueueSize: 1000,
+  maxMessageAge: 60000, // 1 minute
+  ordered: true,
+  maxRetransmits: undefined
+} as const;
+
+/**
+ * Durable channel that survives WebRTC peer connection drops
+ *
+ * The DurableChannel wraps an RTCDataChannel and provides:
+ * - Automatic message queuing during disconnections
+ * - Queue flushing on reconnection
+ * - Configurable queue size and message age limits
+ * - RTCDataChannel-compatible API
+ *
+ * @example
+ * ```typescript
+ * const channel = new DurableChannel('chat', connection, {
+ *   maxQueueSize: 500,
+ *   maxMessageAge: 30000
+ * });
+ *
+ * channel.on('message', (data) => {
+ *   console.log('Received:', data);
+ * });
+ *
+ * channel.on('open', () => {
+ *   channel.send('Hello!');
+ * });
+ *
+ * // Messages sent during disconnection are automatically queued
+ * channel.send('This will be queued if disconnected');
+ * ```
+ */
+export class DurableChannel extends EventEmitter<DurableChannelEvents> {
+  readonly label: string;
+  readonly config: DurableChannelConfig;
+
+  private _state: DurableChannelState;
+  private underlyingChannel?: RTCDataChannel;
+  private messageQueue: QueuedMessage[] = [];
+  private queueProcessing: boolean = false;
+  private _bufferedAmountLowThreshold: number = 0;
+
+  // Event handlers that need cleanup
+  private openHandler?: () => void;
+  private messageHandler?: (event: MessageEvent) => void;
+  private errorHandler?: (event: Event) => void;
+  private closeHandler?: () => void;
+  private bufferedAmountLowHandler?: () => void;
+
+  constructor(
+    label: string,
+    config?: DurableChannelConfig
+  ) {
+    super();
+    this.label = label;
+    this.config = { ...DEFAULT_CONFIG, ...config };
+    this._state = DurableChannelState.CONNECTING;
+  }
+
+  /**
+   * Current channel state
+   */
+  get readyState(): DurableChannelState {
+    return this._state;
+  }
+
+  /**
+   * Buffered amount from underlying channel (0 if no channel)
+   */
+  get bufferedAmount(): number {
+    return this.underlyingChannel?.bufferedAmount ?? 0;
+  }
+
+  /**
+   * Buffered amount low threshold
+   */
+  get bufferedAmountLowThreshold(): number {
+    return this._bufferedAmountLowThreshold;
+  }
+
+  set bufferedAmountLowThreshold(value: number) {
+    this._bufferedAmountLowThreshold = value;
+    if (this.underlyingChannel) {
+      this.underlyingChannel.bufferedAmountLowThreshold = value;
+    }
+  }
+
+  /**
+   * Send data through the channel
+   *
+   * If the channel is open, sends immediately. Otherwise, queues the message
+   * for delivery when the channel reconnects.
+   *
+   * @param data - Data to send
+   */
+  send(data: string | Blob | ArrayBuffer | ArrayBufferView): void {
+    if (this._state === DurableChannelState.OPEN && this.underlyingChannel) {
+      // Channel is open - send immediately
+      try {
+        this.underlyingChannel.send(data as any);
+      } catch (error) {
+        // Send failed - queue the message
+        this.enqueueMessage(data);
+        this.emit('error', error as Error);
+      }
+    } else if (this._state !== DurableChannelState.CLOSED) {
+      // Channel is not open but not closed - queue the message
+      this.enqueueMessage(data);
+    } else {
+      // Channel is closed - throw error
+      throw new Error('Cannot send on closed channel');
+    }
+  }
+
+  /**
+   * Close the channel
+   */
+  close(): void {
+    if (this._state === DurableChannelState.CLOSED ||
+        this._state === DurableChannelState.CLOSING) {
+      return;
+    }
+
+    this._state = DurableChannelState.CLOSING;
+
+    if (this.underlyingChannel) {
+      this.underlyingChannel.close();
+    }
+
+    this._state = DurableChannelState.CLOSED;
+    this.emit('close');
+  }
+
+  /**
+   * Attach to an underlying RTCDataChannel
+   *
+   * This is called when a WebRTC connection is established (or re-established).
+   * The channel will flush any queued messages and forward events.
+   *
+   * @param channel - RTCDataChannel to attach to
+   * @internal
+   */
+  attachToChannel(channel: RTCDataChannel): void {
+    // Detach from any existing channel first
+    this.detachFromChannel();
+
+    this.underlyingChannel = channel;
+
+    // Set buffered amount low threshold
+    channel.bufferedAmountLowThreshold = this._bufferedAmountLowThreshold;
+
+    // Setup event handlers
+    this.openHandler = () => {
+      this._state = DurableChannelState.OPEN;
+      this.emit('open');
+
+      // Flush queued messages
+      this.flushQueue().catch(error => {
+        this.emit('error', error);
+      });
+    };
+
+    this.messageHandler = (event: MessageEvent) => {
+      this.emit('message', event.data);
+    };
+
+    this.errorHandler = (event: Event) => {
+      this.emit('error', new Error(`Channel error: ${event.type}`));
+    };
+
+    this.closeHandler = () => {
+      if (this._state !== DurableChannelState.CLOSING &&
+          this._state !== DurableChannelState.CLOSED) {
+        // Unexpected close - transition to connecting (will reconnect)
+        this._state = DurableChannelState.CONNECTING;
+      }
+    };
+
+    this.bufferedAmountLowHandler = () => {
+      this.emit('bufferedAmountLow');
+    };
+
+    // Attach handlers
+    channel.addEventListener('open', this.openHandler);
+    channel.addEventListener('message', this.messageHandler);
+    channel.addEventListener('error', this.errorHandler);
+    channel.addEventListener('close', this.closeHandler);
+    channel.addEventListener('bufferedamountlow', this.bufferedAmountLowHandler);
+
+    // If channel is already open, trigger open event
+    if (channel.readyState === 'open') {
+      this.openHandler();
+    } else if (channel.readyState === 'connecting') {
+      this._state = DurableChannelState.CONNECTING;
+    }
+  }
+
+  /**
+   * Detach from the underlying RTCDataChannel
+   *
+   * This is called when a WebRTC connection drops. The channel remains alive
+   * and continues queuing messages.
+   *
+   * @internal
+   */
+  detachFromChannel(): void {
+    if (!this.underlyingChannel) {
+      return;
+    }
+
+    // Remove event listeners
+    if (this.openHandler) {
+      this.underlyingChannel.removeEventListener('open', this.openHandler);
+    }
+    if (this.messageHandler) {
+      this.underlyingChannel.removeEventListener('message', this.messageHandler);
+    }
+    if (this.errorHandler) {
+      this.underlyingChannel.removeEventListener('error', this.errorHandler);
+    }
+    if (this.closeHandler) {
+      this.underlyingChannel.removeEventListener('close', this.closeHandler);
+    }
+    if (this.bufferedAmountLowHandler) {
+      this.underlyingChannel.removeEventListener('bufferedamountlow', this.bufferedAmountLowHandler);
+    }
+
+    this.underlyingChannel = undefined;
+    this._state = DurableChannelState.CONNECTING;
+  }
+
+  /**
+   * Enqueue a message for later delivery
+   */
+  private enqueueMessage(data: string | Blob | ArrayBuffer | ArrayBufferView): void {
+    // Prune old messages first
+    this.pruneOldMessages();
+
+    const message: QueuedMessage = {
+      data,
+      enqueuedAt: Date.now(),
+      id: `msg-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`
+    };
+
+    this.messageQueue.push(message);
+
+    // Handle overflow
+    const maxQueueSize = this.config.maxQueueSize ?? 1000;
+    if (this.messageQueue.length > maxQueueSize) {
+      const excess = this.messageQueue.length - maxQueueSize;
+      this.messageQueue.splice(0, excess);
+      this.emit('queueOverflow', excess);
+      console.warn(
+        `DurableChannel[${this.label}]: Dropped ${excess} messages due to queue overflow`
+      );
+    }
+  }
+
+  /**
+   * Flush all queued messages through the channel
+   */
+  private async flushQueue(): Promise<void> {
+    if (this.queueProcessing || !this.underlyingChannel ||
+        this.underlyingChannel.readyState !== 'open') {
+      return;
+    }
+
+    this.queueProcessing = true;
+
+    try {
+      // Prune old messages before flushing
+      this.pruneOldMessages();
+
+      // Send all queued messages
+      while (this.messageQueue.length > 0) {
+        const message = this.messageQueue.shift();
+        if (!message) break;
+
+        try {
+          this.underlyingChannel.send(message.data as any);
+        } catch (error) {
+          // Send failed - re-queue message
+          this.messageQueue.unshift(message);
+          throw error;
+        }
+
+        // If buffer is getting full, wait for it to drain
+        if (this.underlyingChannel.bufferedAmount > 16 * 1024 * 1024) { // 16MB
+          await new Promise<void>((resolve) => {
+            const checkBuffer = () => {
+              if (!this.underlyingChannel ||
+                  this.underlyingChannel.bufferedAmount < 8 * 1024 * 1024) {
+                resolve();
+              } else {
+                setTimeout(checkBuffer, 100);
+              }
+            };
+            checkBuffer();
+          });
+        }
+      }
+    } finally {
+      this.queueProcessing = false;
+    }
+  }
+
+  /**
+   * Remove messages older than maxMessageAge from the queue
+   */
+  private pruneOldMessages(): void {
+    const maxMessageAge = this.config.maxMessageAge ?? 60000;
+    if (maxMessageAge === Infinity || maxMessageAge <= 0) {
+      return;
+    }
+
+    const now = Date.now();
+    const cutoff = now - maxMessageAge;
+
+    const originalLength = this.messageQueue.length;
+    this.messageQueue = this.messageQueue.filter(msg => msg.enqueuedAt >= cutoff);
+
+    const pruned = originalLength - this.messageQueue.length;
+    if (pruned > 0) {
+      console.warn(
+        `DurableChannel[${this.label}]: Pruned ${pruned} old messages (older than ${maxMessageAge}ms)`
+      );
+    }
+  }
+
+  /**
+   * Get the current queue size
+   *
+   * @internal
+   */
+  getQueueSize(): number {
+    return this.messageQueue.length;
+  }
+}

src/durable/connection.ts

@@ -0,0 +1,453 @@
+/**
+ * DurableConnection - WebRTC connection with automatic reconnection
+ *
+ * Manages the WebRTC peer lifecycle and automatically reconnects on
+ * connection drops with exponential backoff.
+ */
+
+import { EventEmitter } from '../event-emitter.js';
+import RondevuPeer from '../peer/index.js';
+import type { RondevuOffers } from '../offers.js';
+import { DurableChannel } from './channel.js';
+import { createReconnectionScheduler, type ReconnectionScheduler } from './reconnection.js';
+import {
+  DurableConnectionState
+} from './types.js';
+import type {
+  DurableConnectionConfig,
+  DurableConnectionEvents,
+  ConnectionInfo
+} from './types.js';
+
+/**
+ * Default configuration for durable connections
+ */
+const DEFAULT_CONFIG: Required<DurableConnectionConfig> = {
+  maxReconnectAttempts: 10,
+  reconnectBackoffBase: 1000,
+  reconnectBackoffMax: 30000,
+  reconnectJitter: 0.2,
+  connectionTimeout: 30000,
+  maxQueueSize: 1000,
+  maxMessageAge: 60000,
+  rtcConfig: {
+    iceServers: [
+      { urls: 'stun:stun.l.google.com:19302' },
+      { urls: 'stun:stun1.l.google.com:19302' }
+    ]
+  }
+};
+
+/**
+ * Durable WebRTC connection that automatically reconnects
+ *
+ * The DurableConnection manages the lifecycle of a WebRTC peer connection
+ * and provides:
+ * - Automatic reconnection with exponential backoff
+ * - Multiple durable channels that survive reconnections
+ * - Configurable retry limits and timeouts
+ * - High-level connection state events
+ *
+ * @example
+ * ```typescript
+ * const connection = new DurableConnection(
+ *   offersApi,
+ *   { username: 'alice', serviceFqn: 'chat@1.0.0' },
+ *   { maxReconnectAttempts: 5 }
+ * );
+ *
+ * connection.on('connected', () => {
+ *   console.log('Connected!');
+ * });
+ *
+ * connection.on('reconnecting', (attempt, max, delay) => {
+ *   console.log(`Reconnecting... (${attempt}/${max}, retry in ${delay}ms)`);
+ * });
+ *
+ * const channel = connection.createChannel('chat');
+ * channel.on('message', (data) => {
+ *   console.log('Received:', data);
+ * });
+ *
+ * await connection.connect();
+ * ```
+ */
+export class DurableConnection extends EventEmitter<DurableConnectionEvents> {
+  readonly connectionId: string;
+  readonly config: Required<DurableConnectionConfig>;
+  readonly connectionInfo: ConnectionInfo;
+
+  private _state: DurableConnectionState;
+  private currentPeer?: RondevuPeer;
+  private channels: Map<string, DurableChannel> = new Map();
+  private reconnectionScheduler?: ReconnectionScheduler;
+
+  // Track peer event handlers for cleanup
+  private peerConnectedHandler?: () => void;
+  private peerDisconnectedHandler?: () => void;
+  private peerFailedHandler?: (error: Error) => void;
+  private peerDataChannelHandler?: (channel: RTCDataChannel) => void;
+
+  constructor(
+    private offersApi: RondevuOffers,
+    connectionInfo: ConnectionInfo,
+    config?: DurableConnectionConfig
+  ) {
+    super();
+    this.connectionId = `conn-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
+    this.config = { ...DEFAULT_CONFIG, ...config };
+    this.connectionInfo = connectionInfo;
+    this._state = DurableConnectionState.CONNECTING;
+  }
+
+  /**
+   * Current connection state
+   */
+  getState(): DurableConnectionState {
+    return this._state;
+  }
+
+  /**
+   * Check if connection is currently connected
+   */
+  isConnected(): boolean {
+    return this._state === DurableConnectionState.CONNECTED;
+  }
+
+  /**
+   * Create a durable channel on this connection
+   *
+   * The channel will be created on the current peer connection if available,
+   * otherwise it will be created when the connection is established.
+   *
+   * @param label - Channel label
+   * @param options - RTCDataChannel init options
+   * @returns DurableChannel instance
+   */
+  createChannel(label: string, options?: RTCDataChannelInit): DurableChannel {
+    // Check if channel already exists
+    if (this.channels.has(label)) {
+      throw new Error(`Channel with label '${label}' already exists`);
+    }
+
+    // Create durable channel
+    const durableChannel = new DurableChannel(label, {
+      maxQueueSize: this.config.maxQueueSize,
+      maxMessageAge: this.config.maxMessageAge,
+      ordered: options?.ordered ?? true,
+      maxRetransmits: options?.maxRetransmits
+    });
+
+    this.channels.set(label, durableChannel);
+
+    // If we have a current peer, attach the channel
+    if (this.currentPeer && this._state === DurableConnectionState.CONNECTED) {
+      this.createAndAttachChannel(durableChannel, options);
+    }
+
+    return durableChannel;
+  }
+
+  /**
+   * Get an existing channel by label
+   */
+  getChannel(label: string): DurableChannel | undefined {
+    return this.channels.get(label);
+  }
+
+  /**
+   * Establish the initial connection
+   *
+   * @returns Promise that resolves when connected
+   */
+  async connect(): Promise<void> {
+    if (this._state !== DurableConnectionState.CONNECTING) {
+      throw new Error(`Cannot connect from state: ${this._state}`);
+    }
+
+    try {
+      await this.establishConnection();
+    } catch (error) {
+      this._state = DurableConnectionState.DISCONNECTED;
+      await this.handleDisconnection();
+      throw error;
+    }
+  }
+
+  /**
+   * Close the connection gracefully
+   */
+  async close(): Promise<void> {
+    if (this._state === DurableConnectionState.CLOSED) {
+      return;
+    }
+
+    const previousState = this._state;
+    this._state = DurableConnectionState.CLOSED;
+
+    // Cancel any ongoing reconnection
+    if (this.reconnectionScheduler) {
+      this.reconnectionScheduler.cancel();
+    }
+
+    // Close all channels
+    for (const channel of this.channels.values()) {
+      channel.close();
+    }
+
+    // Close peer connection
+    if (this.currentPeer) {
+      await this.currentPeer.close();
+      this.currentPeer = undefined;
+    }
+
+    this.emit('state', this._state, previousState);
+    this.emit('closed');
+  }
+
+  /**
+   * Establish a WebRTC connection
+   */
+  private async establishConnection(): Promise<void> {
+    // Create new peer
+    const peer = new RondevuPeer(this.offersApi, this.config.rtcConfig);
+    this.currentPeer = peer;
+
+    // Setup peer event handlers
+    this.setupPeerHandlers(peer);
+
+    // Determine connection method based on connection info
+    if (this.connectionInfo.uuid) {
+      // Connect by UUID
+      await this.connectByUuid(peer, this.connectionInfo.uuid);
+    } else if (this.connectionInfo.username && this.connectionInfo.serviceFqn) {
+      // Connect by username and service FQN
+      await this.connectByService(peer, this.connectionInfo.username, this.connectionInfo.serviceFqn);
+    } else {
+      throw new Error('Invalid connection info: must provide either uuid or (username + serviceFqn)');
+    }
+
+    // Wait for connection with timeout
+    await this.waitForConnection(peer);
+
+    // Connection established
+    this.transitionToConnected();
+  }
+
+  /**
+   * Connect to a service by UUID
+   */
+  private async connectByUuid(peer: RondevuPeer, uuid: string): Promise<void> {
+    // Get service details
+    const response = await fetch(`${this.offersApi['baseUrl']}/services/${uuid}`);
+    if (!response.ok) {
+      throw new Error(`Service not found: ${uuid}`);
+    }
+
+    const service = await response.json();
+
+    // Answer the offer
+    await peer.answer(service.offerId, service.sdp, {
+      secret: this.offersApi['credentials'].secret,
+      topics: []
+    });
+  }
+
+  /**
+   * Connect to a service by username and service FQN
+   */
+  private async connectByService(peer: RondevuPeer, username: string, serviceFqn: string): Promise<void> {
+    // Query service to get UUID
+    const response = await fetch(`${this.offersApi['baseUrl']}/index/${username}/query`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ serviceFqn })
+    });
+
+    if (!response.ok) {
+      throw new Error(`Service not found: ${username}/${serviceFqn}`);
+    }
+
+    const { uuid } = await response.json();
+
+    // Connect by UUID
+    await this.connectByUuid(peer, uuid);
+  }
+
+  /**
+   * Wait for peer connection to establish
+   */
+  private async waitForConnection(peer: RondevuPeer): Promise<void> {
+    return new Promise((resolve, reject) => {
+      const timeout = setTimeout(() => {
+        reject(new Error('Connection timeout'));
+      }, this.config.connectionTimeout);
+
+      const onConnected = () => {
+        clearTimeout(timeout);
+        peer.off('connected', onConnected);
+        peer.off('failed', onFailed);
+        resolve();
+      };
+
+      const onFailed = (error: Error) => {
+        clearTimeout(timeout);
+        peer.off('connected', onConnected);
+        peer.off('failed', onFailed);
+        reject(error);
+      };
+
+      peer.on('connected', onConnected);
+      peer.on('failed', onFailed);
+    });
+  }
+
+  /**
+   * Setup event handlers for peer
+   */
+  private setupPeerHandlers(peer: RondevuPeer): void {
+    this.peerConnectedHandler = () => {
+      // Connection established - will be handled by waitForConnection
+    };
+
+    this.peerDisconnectedHandler = () => {
+      if (this._state !== DurableConnectionState.CLOSED) {
+        this.handleDisconnection();
+      }
+    };
+
+    this.peerFailedHandler = (error: Error) => {
+      if (this._state !== DurableConnectionState.CLOSED) {
+        console.error('Peer connection failed:', error);
+        this.handleDisconnection();
+      }
+    };
+
+    this.peerDataChannelHandler = (channel: RTCDataChannel) => {
+      // Find or create durable channel
+      let durableChannel = this.channels.get(channel.label);
+
+      if (!durableChannel) {
+        // Auto-create channel for incoming data channels
+        durableChannel = new DurableChannel(channel.label, {
+          maxQueueSize: this.config.maxQueueSize,
+          maxMessageAge: this.config.maxMessageAge
+        });
+        this.channels.set(channel.label, durableChannel);
+      }
+
+      // Attach the received channel
+      durableChannel.attachToChannel(channel);
+    };
+
+    peer.on('connected', this.peerConnectedHandler);
+    peer.on('disconnected', this.peerDisconnectedHandler);
+    peer.on('failed', this.peerFailedHandler);
+    peer.on('datachannel', this.peerDataChannelHandler);
+  }
+
+  /**
+   * Transition to connected state
+   */
+  private transitionToConnected(): void {
+    const previousState = this._state;
+    this._state = DurableConnectionState.CONNECTED;
+
+    // Reset reconnection scheduler if it exists
+    if (this.reconnectionScheduler) {
+      this.reconnectionScheduler.reset();
+    }
+
+    // Attach all channels to the new peer connection
+    for (const [label, channel] of this.channels) {
+      if (this.currentPeer) {
+        this.createAndAttachChannel(channel);
+      }
+    }
+
+    this.emit('state', this._state, previousState);
+    this.emit('connected');
+  }
+
+  /**
+   * Create underlying RTCDataChannel and attach to durable channel
+   */
+  private createAndAttachChannel(
+    durableChannel: DurableChannel,
+    options?: RTCDataChannelInit
+  ): void {
+    if (!this.currentPeer) {
+      return;
+    }
+
+    // Check if peer already has this channel (received via datachannel event)
+    // If not, create it
+    const senders = (this.currentPeer.pc as any).getSenders?.() || [];
+    const existingChannel = Array.from(senders as RTCRtpSender[])
+      .map((sender) => (sender as any).channel as RTCDataChannel)
+      .find(ch => ch && ch.label === durableChannel.label);
+
+    if (existingChannel) {
+      durableChannel.attachToChannel(existingChannel);
+    } else {
+      // Create new channel on peer
+      const rtcChannel = this.currentPeer.createDataChannel(
+        durableChannel.label,
+        options
+      );
+      durableChannel.attachToChannel(rtcChannel);
+    }
+  }
+
+  /**
+   * Handle connection disconnection
+   */
+  private async handleDisconnection(): Promise<void> {
+    if (this._state === DurableConnectionState.CLOSED ||
+        this._state === DurableConnectionState.FAILED) {
+      return;
+    }
+
+    const previousState = this._state;
+    this._state = DurableConnectionState.RECONNECTING;
+
+    this.emit('state', this._state, previousState);
+    this.emit('disconnected');
+
+    // Detach all channels (but keep them alive)
+    for (const channel of this.channels.values()) {
+      channel.detachFromChannel();
+    }
+
+    // Close old peer
+    if (this.currentPeer) {
+      await this.currentPeer.close();
+      this.currentPeer = undefined;
+    }
+
+    // Create or use existing reconnection scheduler
+    if (!this.reconnectionScheduler) {
+      this.reconnectionScheduler = createReconnectionScheduler({
+        maxAttempts: this.config.maxReconnectAttempts,
+        backoffBase: this.config.reconnectBackoffBase,
+        backoffMax: this.config.reconnectBackoffMax,
+        jitter: this.config.reconnectJitter,
+        onReconnect: async () => {
+          await this.establishConnection();
+        },
+        onMaxAttemptsExceeded: (error) => {
+          const prevState = this._state;
+          this._state = DurableConnectionState.FAILED;
+          this.emit('state', this._state, prevState);
+          this.emit('failed', error, true);
+        },
+        onBeforeAttempt: (attempt, max, delay) => {
+          this.emit('reconnecting', attempt, max, delay);
+        }
+      });
+    }
+
+    // Schedule reconnection
+    this.reconnectionScheduler.schedule();
+  }
+}

src/durable/reconnection.ts

@@ -0,0 +1,200 @@
+/**
+ * Reconnection utilities for durable connections
+ *
+ * This module provides utilities for managing reconnection logic with
+ * exponential backoff and jitter.
+ */
+
+/**
+ * Calculate exponential backoff delay with jitter
+ *
+ * @param attempt - Current attempt number (0-indexed)
+ * @param base - Base delay in milliseconds
+ * @param max - Maximum delay in milliseconds
+ * @param jitter - Jitter factor (0-1), e.g., 0.2 for ±20%
+ * @returns Delay in milliseconds with jitter applied
+ *
+ * @example
+ * ```typescript
+ * calculateBackoff(0, 1000, 30000, 0.2) // ~1000ms ± 20%
+ * calculateBackoff(1, 1000, 30000, 0.2) // ~2000ms ± 20%
+ * calculateBackoff(2, 1000, 30000, 0.2) // ~4000ms ± 20%
+ * calculateBackoff(5, 1000, 30000, 0.2) // ~30000ms ± 20% (capped at max)
+ * ```
+ */
+export function calculateBackoff(
+  attempt: number,
+  base: number,
+  max: number,
+  jitter: number
+): number {
+  // Calculate exponential delay: base * 2^attempt
+  const exponential = base * Math.pow(2, attempt);
+
+  // Cap at maximum
+  const capped = Math.min(exponential, max);
+
+  // Apply jitter: ± (jitter * capped)
+  const jitterAmount = capped * jitter;
+  const randomJitter = (Math.random() * 2 - 1) * jitterAmount;
+
+  // Return delay with jitter, ensuring it's not negative
+  return Math.max(0, capped + randomJitter);
+}
+
+/**
+ * Configuration for reconnection scheduler
+ */
+export interface ReconnectionSchedulerConfig {
+  /** Maximum number of reconnection attempts */
+  maxAttempts: number;
+
+  /** Base delay for exponential backoff */
+  backoffBase: number;
+
+  /** Maximum delay between attempts */
+  backoffMax: number;
+
+  /** Jitter factor for randomizing delays */
+  jitter: number;
+
+  /** Callback invoked for each reconnection attempt */
+  onReconnect: () => Promise<void>;
+
+  /** Callback invoked when max attempts exceeded */
+  onMaxAttemptsExceeded: (error: Error) => void;
+
+  /** Optional callback invoked before each attempt */
+  onBeforeAttempt?: (attempt: number, maxAttempts: number, delay: number) => void;
+}
+
+/**
+ * Reconnection scheduler state
+ */
+export interface ReconnectionScheduler {
+  /** Current attempt number */
+  attempt: number;
+
+  /** Whether scheduler is active */
+  active: boolean;
+
+  /** Schedule next reconnection attempt */
+  schedule: () => void;
+
+  /** Cancel scheduled reconnection */
+  cancel: () => void;
+
+  /** Reset attempt counter */
+  reset: () => void;
+}
+
+/**
+ * Create a reconnection scheduler
+ *
+ * @param config - Scheduler configuration
+ * @returns Reconnection scheduler instance
+ *
+ * @example
+ * ```typescript
+ * const scheduler = createReconnectionScheduler({
+ *   maxAttempts: 10,
+ *   backoffBase: 1000,
+ *   backoffMax: 30000,
+ *   jitter: 0.2,
+ *   onReconnect: async () => {
+ *     await connect();
+ *   },
+ *   onMaxAttemptsExceeded: (error) => {
+ *     console.error('Failed to reconnect:', error);
+ *   },
+ *   onBeforeAttempt: (attempt, max, delay) => {
+ *     console.log(`Reconnecting in ${delay}ms (${attempt}/${max})...`);
+ *   }
+ * });
+ *
+ * // Start reconnection
+ * scheduler.schedule();
+ *
+ * // Cancel reconnection
+ * scheduler.cancel();
+ * ```
+ */
+export function createReconnectionScheduler(
+  config: ReconnectionSchedulerConfig
+): ReconnectionScheduler {
+  let attempt = 0;
+  let active = false;
+  let timer: ReturnType<typeof setTimeout> | undefined;
+
+  const schedule = () => {
+    // Cancel any existing timer
+    if (timer) {
+      clearTimeout(timer);
+      timer = undefined;
+    }
+
+    // Check if max attempts exceeded
+    if (attempt >= config.maxAttempts) {
+      active = false;
+      config.onMaxAttemptsExceeded(
+        new Error(`Max reconnection attempts exceeded (${config.maxAttempts})`)
+      );
+      return;
+    }
+
+    // Calculate delay
+    const delay = calculateBackoff(
+      attempt,
+      config.backoffBase,
+      config.backoffMax,
+      config.jitter
+    );
+
+    // Notify before attempt
+    if (config.onBeforeAttempt) {
+      config.onBeforeAttempt(attempt + 1, config.maxAttempts, delay);
+    }
+
+    // Mark as active
+    active = true;
+
+    // Schedule reconnection
+    timer = setTimeout(async () => {
+      attempt++;
+      try {
+        await config.onReconnect();
+        // Success - reset scheduler
+        attempt = 0;
+        active = false;
+      } catch (error) {
+        // Failure - schedule next attempt
+        schedule();
+      }
+    }, delay);
+  };
+
+  const cancel = () => {
+    if (timer) {
+      clearTimeout(timer);
+      timer = undefined;
+    }
+    active = false;
+  };
+
+  const reset = () => {
+    cancel();
+    attempt = 0;
+  };
+
+  return {
+    get attempt() {
+      return attempt;
+    },
+    get active() {
+      return active;
+    },
+    schedule,
+    cancel,
+    reset
+  };
+}

src/durable/service.ts

@@ -0,0 +1,329 @@
+/**
+ * DurableService - Service with automatic TTL refresh
+ *
+ * Manages service publishing with automatic reconnection for incoming
+ * connections and TTL auto-refresh to prevent expiration.
+ */
+
+import { EventEmitter } from '../event-emitter.js';
+import { ServicePool, type PoolStatus } from '../service-pool.js';
+import type { RondevuOffers } from '../offers.js';
+import { DurableChannel } from './channel.js';
+import type {
+  DurableServiceConfig,
+  DurableServiceEvents,
+  ServiceInfo
+} from './types.js';
+
+/**
+ * Connection handler callback
+ */
+export type ConnectionHandler = (
+  channel: DurableChannel,
+  connectionId: string
+) => void | Promise<void>;
+
+/**
+ * Default configuration for durable services
+ */
+const DEFAULT_CONFIG = {
+  isPublic: false,
+  ttlRefreshMargin: 0.2,
+  poolSize: 1,
+  pollingInterval: 2000,
+  maxReconnectAttempts: 10,
+  reconnectBackoffBase: 1000,
+  reconnectBackoffMax: 30000,
+  reconnectJitter: 0.2,
+  connectionTimeout: 30000,
+  maxQueueSize: 1000,
+  maxMessageAge: 60000,
+  rtcConfig: {
+    iceServers: [
+      { urls: 'stun:stun.l.google.com:19302' },
+      { urls: 'stun:stun1.l.google.com:19302' }
+    ]
+  }
+};
+
+/**
+ * Durable service that automatically refreshes TTL and handles reconnections
+ *
+ * The DurableService manages service publishing and provides:
+ * - Automatic TTL refresh before expiration
+ * - Durable connections for incoming peers
+ * - Connection pooling for multiple simultaneous connections
+ * - High-level connection lifecycle events
+ *
+ * @example
+ * ```typescript
+ * const service = new DurableService(
+ *   offersApi,
+ *   (channel, connectionId) => {
+ *     channel.on('message', (data) => {
+ *       console.log(`Message from ${connectionId}:`, data);
+ *       channel.send(`Echo: ${data}`);
+ *     });
+ *   },
+ *   {
+ *     username: 'alice',
+ *     privateKey: keypair.privateKey,
+ *     serviceFqn: 'chat@1.0.0',
+ *     poolSize: 10
+ *   }
+ * );
+ *
+ * service.on('published', (serviceId, uuid) => {
+ *   console.log(`Service published: ${uuid}`);
+ * });
+ *
+ * service.on('connection', (connectionId) => {
+ *   console.log(`New connection: ${connectionId}`);
+ * });
+ *
+ * await service.start();
+ * ```
+ */
+export class DurableService extends EventEmitter<DurableServiceEvents> {
+  readonly config: Required<DurableServiceConfig>;
+
+  private serviceId?: string;
+  private uuid?: string;
+  private expiresAt?: number;
+  private ttlRefreshTimer?: ReturnType<typeof setTimeout>;
+  private servicePool?: ServicePool;
+  private activeChannels: Map<string, DurableChannel> = new Map();
+
+  constructor(
+    private offersApi: RondevuOffers,
+    private baseUrl: string,
+    private credentials: { peerId: string; secret: string },
+    private handler: ConnectionHandler,
+    config: DurableServiceConfig
+  ) {
+    super();
+    this.config = { ...DEFAULT_CONFIG, ...config } as Required<DurableServiceConfig>;
+  }
+
+  /**
+   * Start the service
+   *
+   * Publishes the service and begins accepting connections.
+   *
+   * @returns Service information
+   */
+  async start(): Promise<ServiceInfo> {
+    if (this.servicePool) {
+      throw new Error('Service already started');
+    }
+
+    // Create and start service pool
+    this.servicePool = new ServicePool(
+      this.baseUrl,
+      this.credentials,
+      {
+        username: this.config.username,
+        privateKey: this.config.privateKey,
+        serviceFqn: this.config.serviceFqn,
+        rtcConfig: this.config.rtcConfig,
+        isPublic: this.config.isPublic,
+        metadata: this.config.metadata,
+        ttl: this.config.ttl,
+        poolSize: this.config.poolSize,
+        pollingInterval: this.config.pollingInterval,
+        handler: (channel, peer, connectionId) => {
+          this.handleNewConnection(channel, connectionId);
+        },
+        onPoolStatus: (status) => {
+          // Could emit pool status event if needed
+        },
+        onError: (error, context) => {
+          this.emit('error', error, context);
+        }
+      }
+    );
+
+    const handle = await this.servicePool.start();
+
+    // Store service info
+    this.serviceId = handle.serviceId;
+    this.uuid = handle.uuid;
+    this.expiresAt = Date.now() + (this.config.ttl || 300000); // Default 5 minutes
+
+    this.emit('published', this.serviceId, this.uuid);
+
+    // Schedule TTL refresh
+    this.scheduleRefresh();
+
+    return {
+      serviceId: this.serviceId,
+      uuid: this.uuid,
+      expiresAt: this.expiresAt
+    };
+  }
+
+  /**
+   * Stop the service
+   *
+   * Unpublishes the service and closes all active connections.
+   */
+  async stop(): Promise<void> {
+    // Cancel TTL refresh
+    if (this.ttlRefreshTimer) {
+      clearTimeout(this.ttlRefreshTimer);
+      this.ttlRefreshTimer = undefined;
+    }
+
+    // Close all active channels
+    for (const channel of this.activeChannels.values()) {
+      channel.close();
+    }
+    this.activeChannels.clear();
+
+    // Stop service pool
+    if (this.servicePool) {
+      await this.servicePool.stop();
+      this.servicePool = undefined;
+    }
+
+    this.emit('closed');
+  }
+
+  /**
+   * Get list of active connection IDs
+   */
+  getActiveConnections(): string[] {
+    return Array.from(this.activeChannels.keys());
+  }
+
+  /**
+   * Get service information
+   */
+  getServiceInfo(): ServiceInfo | null {
+    if (!this.serviceId || !this.uuid || !this.expiresAt) {
+      return null;
+    }
+
+    return {
+      serviceId: this.serviceId,
+      uuid: this.uuid,
+      expiresAt: this.expiresAt
+    };
+  }
+
+  /**
+   * Schedule TTL refresh
+   */
+  private scheduleRefresh(): void {
+    if (!this.expiresAt || !this.config.ttl) {
+      return;
+    }
+
+    // Cancel existing timer
+    if (this.ttlRefreshTimer) {
+      clearTimeout(this.ttlRefreshTimer);
+    }
+
+    // Calculate refresh time (default: refresh at 80% of TTL)
+    const timeUntilExpiry = this.expiresAt - Date.now();
+    const refreshMargin = timeUntilExpiry * this.config.ttlRefreshMargin;
+    const refreshTime = Math.max(0, timeUntilExpiry - refreshMargin);
+
+    // Schedule refresh
+    this.ttlRefreshTimer = setTimeout(() => {
+      this.refreshServiceTTL().catch(error => {
+        this.emit('error', error, 'ttl-refresh');
+        // Retry after short delay
+        setTimeout(() => this.scheduleRefresh(), 5000);
+      });
+    }, refreshTime);
+  }
+
+  /**
+   * Refresh service TTL
+   */
+  private async refreshServiceTTL(): Promise<void> {
+    if (!this.serviceId || !this.uuid) {
+      return;
+    }
+
+    // Delete old service
+    await this.servicePool?.stop();
+
+    // Recreate service pool (this republishes the service)
+    this.servicePool = new ServicePool(
+      this.baseUrl,
+      this.credentials,
+      {
+        username: this.config.username,
+        privateKey: this.config.privateKey,
+        serviceFqn: this.config.serviceFqn,
+        rtcConfig: this.config.rtcConfig,
+        isPublic: this.config.isPublic,
+        metadata: this.config.metadata,
+        ttl: this.config.ttl,
+        poolSize: this.config.poolSize,
+        pollingInterval: this.config.pollingInterval,
+        handler: (channel, peer, connectionId) => {
+          this.handleNewConnection(channel, connectionId);
+        },
+        onPoolStatus: (status) => {
+          // Could emit pool status event if needed
+        },
+        onError: (error, context) => {
+          this.emit('error', error, context);
+        }
+      }
+    );
+
+    const handle = await this.servicePool.start();
+
+    // Update service info
+    this.serviceId = handle.serviceId;
+    this.uuid = handle.uuid;
+    this.expiresAt = Date.now() + (this.config.ttl || 300000);
+
+    this.emit('ttl-refreshed', this.expiresAt);
+
+    // Schedule next refresh
+    this.scheduleRefresh();
+  }
+
+  /**
+   * Handle new incoming connection
+   */
+  private handleNewConnection(channel: RTCDataChannel, connectionId: string): void {
+    // Create durable channel
+    const durableChannel = new DurableChannel(channel.label, {
+      maxQueueSize: this.config.maxQueueSize,
+      maxMessageAge: this.config.maxMessageAge
+    });
+
+    // Attach to underlying channel
+    durableChannel.attachToChannel(channel);
+
+    // Track channel
+    this.activeChannels.set(connectionId, durableChannel);
+
+    // Setup cleanup on close
+    durableChannel.on('close', () => {
+      this.activeChannels.delete(connectionId);
+      this.emit('disconnection', connectionId);
+    });
+
+    // Emit connection event
+    this.emit('connection', connectionId);
+
+    // Invoke user handler
+    try {
+      const result = this.handler(durableChannel, connectionId);
+      if (result && typeof result.then === 'function') {
+        result.catch(error => {
+          this.emit('error', error, 'handler');
+        });
+      }
+    } catch (error) {
+      this.emit('error', error as Error, 'handler');
+    }
+  }
+}

src/durable/types.ts

@@ -0,0 +1,184 @@
+/**
+ * Type definitions for durable WebRTC connections
+ *
+ * This module defines all interfaces, enums, and types used by the durable
+ * connection system for automatic reconnection and message queuing.
+ */
+
+/**
+ * Connection state enum
+ */
+export enum DurableConnectionState {
+  CONNECTING = 'connecting',
+  CONNECTED = 'connected',
+  RECONNECTING = 'reconnecting',
+  DISCONNECTED = 'disconnected',
+  FAILED = 'failed',
+  CLOSED = 'closed'
+}
+
+/**
+ * Channel state enum
+ */
+export enum DurableChannelState {
+  CONNECTING = 'connecting',
+  OPEN = 'open',
+  CLOSING = 'closing',
+  CLOSED = 'closed'
+}
+
+/**
+ * Configuration for durable connections
+ */
+export interface DurableConnectionConfig {
+  /** Maximum number of reconnection attempts (default: 10) */
+  maxReconnectAttempts?: number;
+
+  /** Base delay for exponential backoff in milliseconds (default: 1000) */
+  reconnectBackoffBase?: number;
+
+  /** Maximum delay between reconnection attempts in milliseconds (default: 30000) */
+  reconnectBackoffMax?: number;
+
+  /** Jitter factor for randomizing reconnection delays (default: 0.2 = ±20%) */
+  reconnectJitter?: number;
+
+  /** Timeout for initial connection attempt in milliseconds (default: 30000) */
+  connectionTimeout?: number;
+
+  /** Maximum number of messages to queue during disconnection (default: 1000) */
+  maxQueueSize?: number;
+
+  /** Maximum age of queued messages in milliseconds (default: 60000) */
+  maxMessageAge?: number;
+
+  /** WebRTC configuration */
+  rtcConfig?: RTCConfiguration;
+}
+
+/**
+ * Configuration for durable channels
+ */
+export interface DurableChannelConfig {
+  /** Maximum number of messages to queue (default: 1000) */
+  maxQueueSize?: number;
+
+  /** Maximum age of queued messages in milliseconds (default: 60000) */
+  maxMessageAge?: number;
+
+  /** Whether messages should be delivered in order (default: true) */
+  ordered?: boolean;
+
+  /** Maximum retransmits for unordered channels (default: undefined) */
+  maxRetransmits?: number;
+}
+
+/**
+ * Configuration for durable services
+ */
+export interface DurableServiceConfig extends DurableConnectionConfig {
+  /** Username that owns the service */
+  username: string;
+
+  /** Private key for signing service operations */
+  privateKey: string;
+
+  /** Fully qualified service name (e.g., com.example.chat@1.0.0) */
+  serviceFqn: string;
+
+  /** Whether the service is publicly discoverable (default: false) */
+  isPublic?: boolean;
+
+  /** Optional metadata for the service */
+  metadata?: Record<string, any>;
+
+  /** Time-to-live for service in milliseconds (default: server default) */
+  ttl?: number;
+
+  /** Margin before TTL expiry to trigger refresh (default: 0.2 = refresh at 80%) */
+  ttlRefreshMargin?: number;
+
+  /** Number of simultaneous open offers to maintain (default: 1) */
+  poolSize?: number;
+
+  /** Polling interval for checking answers in milliseconds (default: 2000) */
+  pollingInterval?: number;
+}
+
+/**
+ * Queued message structure
+ */
+export interface QueuedMessage {
+  /** Message data */
+  data: string | Blob | ArrayBuffer | ArrayBufferView;
+
+  /** Timestamp when message was enqueued */
+  enqueuedAt: number;
+
+  /** Unique message ID */
+  id: string;
+}
+
+/**
+ * Event type map for DurableConnection
+ */
+export interface DurableConnectionEvents extends Record<string, (...args: any[]) => void> {
+  'state': (state: DurableConnectionState, previousState: DurableConnectionState) => void;
+  'connected': () => void;
+  'reconnecting': (attempt: number, maxAttempts: number, nextRetryIn: number) => void;
+  'disconnected': () => void;
+  'failed': (error: Error, permanent: boolean) => void;
+  'closed': () => void;
+}
+
+/**
+ * Event type map for DurableChannel
+ */
+export interface DurableChannelEvents extends Record<string, (...args: any[]) => void> {
+  'open': () => void;
+  'message': (data: any) => void;
+  'error': (error: Error) => void;
+  'close': () => void;
+  'bufferedAmountLow': () => void;
+  'queueOverflow': (droppedCount: number) => void;
+}
+
+/**
+ * Event type map for DurableService
+ */
+export interface DurableServiceEvents extends Record<string, (...args: any[]) => void> {
+  'published': (serviceId: string, uuid: string) => void;
+  'connection': (connectionId: string) => void;
+  'disconnection': (connectionId: string) => void;
+  'ttl-refreshed': (expiresAt: number) => void;
+  'error': (error: Error, context: string) => void;
+  'closed': () => void;
+}
+
+/**
+ * Information about a durable connection
+ */
+export interface ConnectionInfo {
+  /** Username (for username-based connections) */
+  username?: string;
+
+  /** Service FQN (for service-based connections) */
+  serviceFqn?: string;
+
+  /** UUID (for UUID-based connections) */
+  uuid?: string;
+}
+
+/**
+ * Service information returned when service is published
+ */
+export interface ServiceInfo {
+  /** Service ID */
+  serviceId: string;
+
+  /** Service UUID for discovery */
+  uuid: string;
+
+  /** Expiration timestamp */
+  expiresAt: number;
+}

src/event-emitter.ts

@@ -1,17 +1,37 @@
 /**
- * Simple EventEmitter implementation for browser and Node.js compatibility
+ * Type-safe EventEmitter implementation for browser and Node.js compatibility
+ *
+ * @template EventMap - A type mapping event names to their handler signatures
+ *
+ * @example
+ * ```typescript
+ * interface MyEvents {
+ *   'data': (value: string) => void;
+ *   'error': (error: Error) => void;
+ *   'ready': () => void;
+ * }
+ *
+ * class MyClass extends EventEmitter<MyEvents> {
+ *   doSomething() {
+ *     this.emit('data', 'hello'); // Type-safe!
+ *     this.emit('error', new Error('oops')); // Type-safe!
+ *     this.emit('ready'); // Type-safe!
+ *   }
+ * }
+ *
+ * const instance = new MyClass();
+ * instance.on('data', (value) => {
+ *   console.log(value.toUpperCase()); // 'value' is typed as string
+ * });
+ * ```
  */
-export class EventEmitter {
-  private events: Map<string, Set<Function>>;
-
-  constructor() {
-    this.events = new Map();
-  }
+export class EventEmitter<EventMap extends Record<string, (...args: any[]) => void>> {
+  private events: Map<keyof EventMap, Set<Function>> = new Map();
 
   /**
    * Register an event listener
    */
-  on(event: string, listener: Function): this {
+  on<K extends keyof EventMap>(event: K, listener: EventMap[K]): this {
     if (!this.events.has(event)) {
       this.events.set(event, new Set());
     }
@@ -22,18 +42,18 @@ export class EventEmitter {
   /**
    * Register a one-time event listener
    */
-  once(event: string, listener: Function): this {
-    const onceWrapper = (...args: any[]) => {
-      this.off(event, onceWrapper);
-      listener.apply(this, args);
+  once<K extends keyof EventMap>(event: K, listener: EventMap[K]): this {
+    const onceWrapper = (...args: Parameters<EventMap[K]>) => {
+      this.off(event, onceWrapper as EventMap[K]);
+      listener(...args);
     };
-    return this.on(event, onceWrapper);
+    return this.on(event, onceWrapper as EventMap[K]);
   }
 
   /**
    * Remove an event listener
    */
-  off(event: string, listener: Function): this {
+  off<K extends keyof EventMap>(event: K, listener: EventMap[K]): this {
     const listeners = this.events.get(event);
     if (listeners) {
       listeners.delete(listener);
@@ -47,7 +67,10 @@ export class EventEmitter {
   /**
    * Emit an event
    */
-  emit(event: string, ...args: any[]): boolean {
+  protected emit<K extends keyof EventMap>(
+    event: K,
+    ...args: Parameters<EventMap[K]>
+  ): boolean {
     const listeners = this.events.get(event);
     if (!listeners || listeners.size === 0) {
       return false;
@@ -55,9 +78,9 @@ export class EventEmitter {
 
     listeners.forEach(listener => {
       try {
-        listener.apply(this, args);
+        (listener as EventMap[K])(...args);
       } catch (err) {
-        console.error(`Error in ${event} event listener:`, err);
+        console.error(`Error in ${String(event)} event listener:`, err);
       }
     });
 
@@ -67,8 +90,8 @@ export class EventEmitter {
   /**
    * Remove all listeners for an event (or all events if not specified)
    */
-  removeAllListeners(event?: string): this {
-    if (event) {
+  removeAllListeners<K extends keyof EventMap>(event?: K): this {
+    if (event !== undefined) {
       this.events.delete(event);
     } else {
       this.events.clear();
@@ -79,7 +102,7 @@ export class EventEmitter {
   /**
    * Get listener count for an event
    */
-  listenerCount(event: string): number {
+  listenerCount<K extends keyof EventMap>(event: K): number {
     const listeners = this.events.get(event);
     return listeners ? listeners.size : 0;
   }

src/index.ts

@@ -1,42 +1,36 @@
 /**
  * @xtr-dev/rondevu-client
- * WebRTC peer signaling and discovery client
+ * WebRTC peer signaling and discovery client with durable connections
  */
 
-// Export main WebRTC client class
-export { Rondevu } from './rondevu';
+// Export main client class
+export { Rondevu } from './rondevu.js';
+export type { RondevuOptions } from './rondevu.js';
 
-// Export connection class
-export { RondevuConnection } from './connection';
+// Export authentication
+export { RondevuAuth } from './auth.js';
+export type { Credentials, FetchFunction } from './auth.js';
 
-// Export low-level signaling client (for advanced usage)
-export { RondevuClient } from './client';
+// Export username API
+export { RondevuUsername } from './usernames.js';
+export type { UsernameClaimResult, UsernameCheckResult } from './usernames.js';
 
-// Export all types
+// Export durable connection APIs
+export { DurableConnection } from './durable/connection.js';
+export { DurableChannel } from './durable/channel.js';
+export { DurableService } from './durable/service.js';
+
+// Export durable connection types
 export type {
-  // WebRTC types
-  RondevuOptions,
-  JoinOptions,
-  ConnectionRole,
-  RondevuConnectionParams,
-  RondevuConnectionEvents,
-  // Signaling types
-  Side,
-  Session,
-  TopicInfo,
-  Pagination,
-  ListTopicsResponse,
-  ListSessionsResponse,
-  CreateOfferRequest,
-  CreateOfferResponse,
-  AnswerRequest,
-  AnswerResponse,
-  PollRequest,
-  PollOffererResponse,
-  PollAnswererResponse,
-  PollResponse,
-  VersionResponse,
-  HealthResponse,
-  ErrorResponse,
-  RondevuClientOptions,
-} from './types';
+  DurableConnectionState,
+  DurableChannelState,
+  DurableConnectionConfig,
+  DurableChannelConfig,
+  DurableServiceConfig,
+  QueuedMessage,
+  DurableConnectionEvents,
+  DurableChannelEvents,
+  DurableServiceEvents,
+  ConnectionInfo,
+  ServiceInfo
+} from './durable/types.js';

src/offer-pool.ts

@@ -0,0 +1,205 @@
+import { RondevuOffers, Offer } from './offers.js';
+
+/**
+ * Represents an offer that has been answered
+ */
+export interface AnsweredOffer {
+  offerId: string;
+  answererId: string;
+  sdp: string; // Answer SDP
+  peerConnection: RTCPeerConnection; // Original peer connection
+  dataChannel?: RTCDataChannel; // Data channel created with offer
+  answeredAt: number;
+}
+
+/**
+ * Configuration options for the offer pool
+ */
+export interface OfferPoolOptions {
+  /** Number of simultaneous open offers to maintain */
+  poolSize: number;
+
+  /** Polling interval in milliseconds (default: 2000ms) */
+  pollingInterval?: number;
+
+  /** Callback invoked when an offer is answered */
+  onAnswered: (answer: AnsweredOffer) => Promise<void>;
+
+  /** Callback to create new offers when refilling the pool */
+  onRefill: (count: number) => Promise<{ offers: Offer[], peerConnections: RTCPeerConnection[], dataChannels: RTCDataChannel[] }>;
+
+  /** Error handler for pool operations */
+  onError: (error: Error, context: string) => void;
+}
+
+/**
+ * Manages a pool of offers with automatic polling and refill
+ *
+ * The OfferPool maintains a configurable number of simultaneous offers,
+ * polls for answers periodically, and automatically refills the pool
+ * when offers are consumed.
+ */
+export class OfferPool {
+  private offers: Map<string, Offer> = new Map();
+  private peerConnections: Map<string, RTCPeerConnection> = new Map();
+  private dataChannels: Map<string, RTCDataChannel> = new Map();
+  private polling: boolean = false;
+  private pollingTimer?: ReturnType<typeof setInterval>;
+  private lastPollTime: number = 0;
+  private readonly pollingInterval: number;
+
+  constructor(
+    private offersApi: RondevuOffers,
+    private options: OfferPoolOptions
+  ) {
+    this.pollingInterval = options.pollingInterval || 2000;
+  }
+
+  /**
+   * Add offers to the pool with their peer connections and data channels
+   */
+  async addOffers(offers: Offer[], peerConnections?: RTCPeerConnection[], dataChannels?: RTCDataChannel[]): Promise<void> {
+    for (let i = 0; i < offers.length; i++) {
+      const offer = offers[i];
+      this.offers.set(offer.id, offer);
+      if (peerConnections && peerConnections[i]) {
+        this.peerConnections.set(offer.id, peerConnections[i]);
+      }
+      if (dataChannels && dataChannels[i]) {
+        this.dataChannels.set(offer.id, dataChannels[i]);
+      }
+    }
+  }
+
+  /**
+   * Start polling for answers
+   */
+  async start(): Promise<void> {
+    if (this.polling) {
+      return;
+    }
+
+    this.polling = true;
+
+    // Do an immediate poll
+    await this.poll().catch((error) => {
+      this.options.onError(error, 'initial-poll');
+    });
+
+    // Start polling interval
+    this.pollingTimer = setInterval(async () => {
+      if (this.polling) {
+        await this.poll().catch((error) => {
+          this.options.onError(error, 'poll');
+        });
+      }
+    }, this.pollingInterval);
+  }
+
+  /**
+   * Stop polling for answers
+   */
+  async stop(): Promise<void> {
+    this.polling = false;
+
+    if (this.pollingTimer) {
+      clearInterval(this.pollingTimer);
+      this.pollingTimer = undefined;
+    }
+  }
+
+  /**
+   * Poll for answers and refill the pool if needed
+   */
+  private async poll(): Promise<void> {
+    try {
+      // Get all answers from server
+      const answers = await this.offersApi.getAnswers();
+
+      // Filter for our pool's offers
+      const myAnswers = answers.filter(a => this.offers.has(a.offerId));
+
+      // Process each answer
+      for (const answer of myAnswers) {
+        // Get the original offer, peer connection, and data channel
+        const offer = this.offers.get(answer.offerId);
+        const pc = this.peerConnections.get(answer.offerId);
+        const channel = this.dataChannels.get(answer.offerId);
+
+        if (!offer || !pc) {
+          continue; // Offer or peer connection already consumed, skip
+        }
+
+        // Remove from pool BEFORE processing to prevent duplicate processing
+        this.offers.delete(answer.offerId);
+        this.peerConnections.delete(answer.offerId);
+        this.dataChannels.delete(answer.offerId);
+
+        // Notify ServicePool with answer, original peer connection, and data channel
+        await this.options.onAnswered({
+          offerId: answer.offerId,
+          answererId: answer.answererId,
+          sdp: answer.sdp,
+          peerConnection: pc,
+          dataChannel: channel,
+          answeredAt: answer.answeredAt
+        });
+      }
+
+      // Immediate refill if below pool size
+      if (this.offers.size < this.options.poolSize) {
+        const needed = this.options.poolSize - this.offers.size;
+
+        try {
+          const result = await this.options.onRefill(needed);
+          await this.addOffers(result.offers, result.peerConnections, result.dataChannels);
+        } catch (refillError) {
+          this.options.onError(
+            refillError as Error,
+            'refill'
+          );
+        }
+      }
+
+      this.lastPollTime = Date.now();
+    } catch (error) {
+      // Don't crash the pool on errors - let error handler deal with it
+      this.options.onError(error as Error, 'poll');
+    }
+  }
+
+  /**
+   * Get the current number of active offers in the pool
+   */
+  getActiveOfferCount(): number {
+    return this.offers.size;
+  }
+
+  /**
+   * Get all active offer IDs
+   */
+  getActiveOfferIds(): string[] {
+    return Array.from(this.offers.keys());
+  }
+
+  /**
+   * Get all active peer connections
+   */
+  getActivePeerConnections(): RTCPeerConnection[] {
+    return Array.from(this.peerConnections.values());
+  }
+
+  /**
+   * Get the last poll timestamp
+   */
+  getLastPollTime(): number {
+    return this.lastPollTime;
+  }
+
+  /**
+   * Check if the pool is currently polling
+   */
+  isPolling(): boolean {
+    return this.polling;
+  }
+}

src/offers.ts

@@ -0,0 +1,321 @@
+import { Credentials, FetchFunction } from './auth.js';
+import { RondevuAuth } from './auth.js';
+
+// Declare Buffer for Node.js compatibility
+declare const Buffer: any;
+
+export interface CreateOfferRequest {
+  sdp: string;
+  topics: string[];
+  ttl?: number;
+  secret?: string;
+  info?: string;
+}
+
+export interface Offer {
+  id: string;
+  peerId: string;
+  sdp: string;
+  topics: string[];
+  createdAt?: number;
+  expiresAt: number;
+  lastSeen: number;
+  secret?: string;
+  hasSecret?: boolean;
+  info?: string;
+  answererPeerId?: string;
+  answerSdp?: string;
+  answeredAt?: number;
+}
+
+export interface IceCandidate {
+  candidate: any; // Full candidate object as plain JSON - don't enforce structure
+  peerId: string;
+  role: 'offerer' | 'answerer';
+  createdAt: number;
+}
+
+export interface TopicInfo {
+  topic: string;
+  activePeers: number;
+}
+
+export class RondevuOffers {
+  private fetchFn: FetchFunction;
+
+  constructor(
+    private baseUrl: string,
+    private credentials: Credentials,
+    fetchFn?: FetchFunction
+  ) {
+    // Use provided fetch or fall back to global fetch
+    this.fetchFn = fetchFn || ((...args) => {
+      if (typeof globalThis.fetch === 'function') {
+        return globalThis.fetch(...args);
+      }
+      throw new Error(
+        'fetch is not available. Please provide a fetch implementation in the constructor options.'
+      );
+    });
+  }
+
+  /**
+   * Create one or more offers
+   */
+  async create(offers: CreateOfferRequest[]): Promise<Offer[]> {
+    const response = await this.fetchFn(`${this.baseUrl}/offers`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: RondevuAuth.createAuthHeader(this.credentials),
+      },
+      body: JSON.stringify({ offers }),
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ error: 'Unknown error' }));
+      throw new Error(`Failed to create offers: ${error.error || response.statusText}`);
+    }
+
+    const data = await response.json();
+    return data.offers;
+  }
+
+  /**
+   * Find offers by topic with optional bloom filter
+   */
+  async findByTopic(
+    topic: string,
+    options?: {
+      bloomFilter?: Uint8Array;
+      limit?: number;
+    }
+  ): Promise<Offer[]> {
+    const params = new URLSearchParams();
+
+    if (options?.bloomFilter) {
+      // Convert to base64
+      const binaryString = String.fromCharCode(...Array.from(options.bloomFilter));
+      const base64 = typeof btoa !== 'undefined'
+        ? btoa(binaryString)
+        : (typeof Buffer !== 'undefined' ? Buffer.from(options.bloomFilter).toString('base64') : '');
+      params.set('bloom', base64);
+    }
+
+    if (options?.limit) {
+      params.set('limit', options.limit.toString());
+    }
+
+    const url = `${this.baseUrl}/offers/by-topic/${encodeURIComponent(topic)}${
+      params.toString() ? '?' + params.toString() : ''
+    }`;
+
+    const response = await this.fetchFn(url, {
+      method: 'GET',
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ error: 'Unknown error' }));
+      throw new Error(`Failed to find offers: ${error.error || response.statusText}`);
+    }
+
+    const data = await response.json();
+    return data.offers;
+  }
+
+  /**
+   * Get all offers from a specific peer
+   */
+  async getByPeerId(peerId: string): Promise<{
+    offers: Offer[];
+    topics: string[];
+  }> {
+    const response = await this.fetchFn(`${this.baseUrl}/peers/${encodeURIComponent(peerId)}/offers`, {
+      method: 'GET',
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ error: 'Unknown error' }));
+      throw new Error(`Failed to get peer offers: ${error.error || response.statusText}`);
+    }
+
+    return await response.json();
+  }
+
+  /**
+   * Get topics with active peer counts (paginated)
+   */
+  async getTopics(options?: {
+    limit?: number;
+    offset?: number;
+    startsWith?: string;
+  }): Promise<{
+    topics: TopicInfo[];
+    total: number;
+    limit: number;
+    offset: number;
+    startsWith?: string;
+  }> {
+    const params = new URLSearchParams();
+
+    if (options?.limit) {
+      params.set('limit', options.limit.toString());
+    }
+
+    if (options?.offset) {
+      params.set('offset', options.offset.toString());
+    }
+
+    if (options?.startsWith) {
+      params.set('startsWith', options.startsWith);
+    }
+
+    const url = `${this.baseUrl}/topics${
+      params.toString() ? '?' + params.toString() : ''
+    }`;
+
+    const response = await this.fetchFn(url, {
+      method: 'GET',
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ error: 'Unknown error' }));
+      throw new Error(`Failed to get topics: ${error.error || response.statusText}`);
+    }
+
+    return await response.json();
+  }
+
+  /**
+   * Get own offers
+   */
+  async getMine(): Promise<Offer[]> {
+    const response = await this.fetchFn(`${this.baseUrl}/offers/mine`, {
+      method: 'GET',
+      headers: {
+        Authorization: RondevuAuth.createAuthHeader(this.credentials),
+      },
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ error: 'Unknown error' }));
+      throw new Error(`Failed to get own offers: ${error.error || response.statusText}`);
+    }
+
+    const data = await response.json();
+    return data.offers;
+  }
+
+  /**
+   * Delete an offer
+   */
+  async delete(offerId: string): Promise<void> {
+    const response = await this.fetchFn(`${this.baseUrl}/offers/${encodeURIComponent(offerId)}`, {
+      method: 'DELETE',
+      headers: {
+        Authorization: RondevuAuth.createAuthHeader(this.credentials),
+      },
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ error: 'Unknown error' }));
+      throw new Error(`Failed to delete offer: ${error.error || response.statusText}`);
+    }
+  }
+
+  /**
+   * Answer an offer
+   */
+  async answer(offerId: string, sdp: string, secret?: string): Promise<void> {
+    const response = await this.fetchFn(`${this.baseUrl}/offers/${encodeURIComponent(offerId)}/answer`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: RondevuAuth.createAuthHeader(this.credentials),
+      },
+      body: JSON.stringify({ sdp, secret }),
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ error: 'Unknown error' }));
+      throw new Error(`Failed to answer offer: ${error.error || response.statusText}`);
+    }
+  }
+
+  /**
+   * Get answers to your offers
+   */
+  async getAnswers(): Promise<Array<{
+    offerId: string;
+    answererId: string;
+    sdp: string;
+    answeredAt: number;
+    topics: string[];
+  }>> {
+    const response = await this.fetchFn(`${this.baseUrl}/offers/answers`, {
+      method: 'GET',
+      headers: {
+        Authorization: RondevuAuth.createAuthHeader(this.credentials),
+      },
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ error: 'Unknown error' }));
+      throw new Error(`Failed to get answers: ${error.error || response.statusText}`);
+    }
+
+    const data = await response.json();
+    return data.answers;
+  }
+
+  /**
+   * Post ICE candidates for an offer
+   */
+  async addIceCandidates(
+    offerId: string,
+    candidates: any[]
+  ): Promise<void> {
+    const response = await this.fetchFn(`${this.baseUrl}/offers/${encodeURIComponent(offerId)}/ice-candidates`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: RondevuAuth.createAuthHeader(this.credentials),
+      },
+      body: JSON.stringify({ candidates }),
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ error: 'Unknown error' }));
+      throw new Error(`Failed to add ICE candidates: ${error.error || response.statusText}`);
+    }
+  }
+
+  /**
+   * Get ICE candidates for an offer
+   */
+  async getIceCandidates(offerId: string, since?: number): Promise<IceCandidate[]> {
+    const params = new URLSearchParams();
+    if (since !== undefined) {
+      params.set('since', since.toString());
+    }
+
+    const url = `${this.baseUrl}/offers/${encodeURIComponent(offerId)}/ice-candidates${
+      params.toString() ? '?' + params.toString() : ''
+    }`;
+
+    const response = await this.fetchFn(url, {
+      method: 'GET',
+      headers: {
+        Authorization: RondevuAuth.createAuthHeader(this.credentials),
+      },
+    });
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ error: 'Unknown error' }));
+      throw new Error(`Failed to get ICE candidates: ${error.error || response.statusText}`);
+    }
+
+    const data = await response.json();
+    return data.candidates;
+  }
+}

src/peer/answering-state.ts

@@ -0,0 +1,49 @@
+import { PeerState } from './state.js';
+import type { PeerOptions } from './types.js';
+import type RondevuPeer from './index.js';
+
+/**
+ * Answering an offer and sending to server
+ */
+export class AnsweringState extends PeerState {
+  constructor(peer: RondevuPeer) {
+    super(peer);
+  }
+
+  get name() { return 'answering'; }
+
+  async answer(offerId: string, offerSdp: string, options: PeerOptions): Promise<void> {
+    try {
+      this.peer.role = 'answerer';
+      this.peer.offerId = offerId;
+
+      // Set remote description
+      await this.peer.pc.setRemoteDescription({
+        type: 'offer',
+        sdp: offerSdp
+      });
+
+      // Create answer
+      const answer = await this.peer.pc.createAnswer();
+
+      // Send answer to server BEFORE setLocalDescription
+      // This registers us as the answerer so ICE candidates will be accepted
+      await this.peer.offersApi.answer(offerId, answer.sdp!, options.secret);
+
+      // Enable trickle ICE - set up handler before ICE gathering starts
+      this.setupIceCandidateHandler();
+
+      // Set local description - ICE gathering starts here
+      // Server already knows we're the answerer, so candidates will be accepted
+      await this.peer.pc.setLocalDescription(answer);
+
+      // Transition to exchanging ICE
+      const { ExchangingIceState } = await import('./exchanging-ice-state.js');
+      this.peer.setState(new ExchangingIceState(this.peer, offerId, options));
+    } catch (error) {
+      const { FailedState } = await import('./failed-state.js');
+      this.peer.setState(new FailedState(this.peer, error as Error));
+      throw error;
+    }
+  }
+}

src/peer/closed-state.ts

@@ -0,0 +1,12 @@
+import { PeerState } from './state.js';
+
+/**
+ * Closed state - connection has been terminated
+ */
+export class ClosedState extends PeerState {
+  get name() { return 'closed'; }
+
+  cleanup(): void {
+    this.peer.pc.close();
+  }
+}

src/peer/connected-state.ts

@@ -0,0 +1,13 @@
+import { PeerState } from './state.js';
+
+/**
+ * Connected state - peer connection is established
+ */
+export class ConnectedState extends PeerState {
+  get name() { return 'connected'; }
+
+  cleanup(): void {
+    // Keep connection alive, but stop any polling
+    // The peer connection will handle disconnects via onconnectionstatechange
+  }
+}

src/peer/creating-offer-state.ts

@@ -0,0 +1,57 @@
+import { PeerState } from './state.js';
+import type { PeerOptions } from './types.js';
+import type RondevuPeer from './index.js';
+
+/**
+ * Creating offer and sending to server
+ */
+export class CreatingOfferState extends PeerState {
+  constructor(peer: RondevuPeer, private options: PeerOptions) {
+    super(peer);
+  }
+
+  get name() { return 'creating-offer'; }
+
+  async createOffer(options: PeerOptions): Promise<string> {
+    try {
+      this.peer.role = 'offerer';
+
+      // Create data channel if requested
+      if (options.createDataChannel !== false) {
+        const channel = this.peer.pc.createDataChannel(
+          options.dataChannelLabel || 'data'
+        );
+        this.peer.emitEvent('datachannel', channel);
+      }
+
+      // Enable trickle ICE - set up handler before ICE gathering starts
+      // Handler will check this.peer.offerId before sending
+      this.setupIceCandidateHandler();
+
+      // Create WebRTC offer
+      const offer = await this.peer.pc.createOffer();
+      await this.peer.pc.setLocalDescription(offer); // ICE gathering starts here
+
+      // Send offer to server immediately (don't wait for ICE)
+      const offers = await this.peer.offersApi.create([{
+        sdp: offer.sdp!,
+        topics: options.topics,
+        ttl: options.ttl || 300000,
+        secret: options.secret
+      }]);
+
+      const offerId = offers[0].id;
+      this.peer.offerId = offerId; // Now handler can send candidates
+
+      // Transition to waiting for answer
+      const { WaitingForAnswerState } = await import('./waiting-for-answer-state.js');
+      this.peer.setState(new WaitingForAnswerState(this.peer, offerId, options));
+
+      return offerId;
+    } catch (error) {
+      const { FailedState } = await import('./failed-state.js');
+      this.peer.setState(new FailedState(this.peer, error as Error));
+      throw error;
+    }
+  }
+}

src/peer/exchanging-ice-state.ts

@@ -0,0 +1,83 @@
+import { PeerState } from './state.js';
+import type { PeerOptions } from './types.js';
+import type RondevuPeer from './index.js';
+
+/**
+ * Exchanging ICE candidates and waiting for connection
+ */
+export class ExchangingIceState extends PeerState {
+  private pollingInterval?: ReturnType<typeof setInterval>;
+  private timeout?: ReturnType<typeof setTimeout>;
+  private lastIceTimestamp = 0;
+
+  constructor(
+    peer: RondevuPeer,
+    private offerId: string,
+    private options: PeerOptions
+  ) {
+    super(peer);
+    this.startPolling();
+  }
+
+  get name() { return 'exchanging-ice'; }
+
+  private startPolling(): void {
+    const connectionTimeout = this.options.timeouts?.iceConnection || 30000;
+
+    this.timeout = setTimeout(async () => {
+      this.cleanup();
+      const { FailedState } = await import('./failed-state.js');
+      this.peer.setState(new FailedState(
+        this.peer,
+        new Error('ICE connection timeout')
+      ));
+    }, connectionTimeout);
+
+    this.pollingInterval = setInterval(async () => {
+      try {
+        const candidates = await this.peer.offersApi.getIceCandidates(
+          this.offerId,
+          this.lastIceTimestamp
+        );
+
+        if (candidates.length > 0) {
+          console.log(`📥 Received ${candidates.length} remote ICE candidate(s)`);
+        }
+
+        for (const cand of candidates) {
+          if (cand.candidate && cand.candidate.candidate && cand.candidate.candidate !== '') {
+            const type = cand.candidate.candidate.includes('typ host') ? 'host' :
+                         cand.candidate.candidate.includes('typ srflx') ? 'srflx' :
+                         cand.candidate.candidate.includes('typ relay') ? 'relay' : 'unknown';
+            console.log(`🧊 Adding remote ${type} ICE candidate:`, cand.candidate.candidate);
+            try {
+              await this.peer.pc.addIceCandidate(new this.peer.RTCIceCandidate(cand.candidate));
+              console.log(`✅ Added remote ${type} ICE candidate`);
+              this.lastIceTimestamp = cand.createdAt;
+            } catch (err) {
+              console.warn(`⚠️ Failed to add remote ${type} ICE candidate:`, err);
+              this.lastIceTimestamp = cand.createdAt;
+            }
+          } else {
+            this.lastIceTimestamp = cand.createdAt;
+          }
+        }
+      } catch (err) {
+        console.error('❌ Error polling for ICE candidates:', err);
+        if (err instanceof Error && err.message.includes('not found')) {
+          this.cleanup();
+          const { FailedState } = await import('./failed-state.js');
+          this.peer.setState(new FailedState(
+            this.peer,
+            new Error('Offer expired or not found')
+          ));
+        }
+      }
+    }, 1000);
+  }
+
+  cleanup(): void {
+    if (this.pollingInterval) clearInterval(this.pollingInterval);
+    if (this.timeout) clearTimeout(this.timeout);
+  }
+}

src/peer/failed-state.ts

@@ -0,0 +1,18 @@
+import { PeerState } from './state.js';
+
+/**
+ * Failed state - connection attempt failed
+ */
+export class FailedState extends PeerState {
+  constructor(peer: any, private error: Error) {
+    super(peer);
+    peer.emitEvent('failed', error);
+  }
+
+  get name() { return 'failed'; }
+
+  cleanup(): void {
+    // Connection is failed, clean up resources
+    this.peer.pc.close();
+  }
+}

src/peer/idle-state.ts

@@ -0,0 +1,18 @@
+import { PeerState } from './state.js';
+import type { PeerOptions } from './types.js';
+
+export class IdleState extends PeerState {
+  get name() { return 'idle'; }
+
+  async createOffer(options: PeerOptions): Promise<string> {
+    const { CreatingOfferState } = await import('./creating-offer-state.js');
+    this.peer.setState(new CreatingOfferState(this.peer, options));
+    return this.peer.state.createOffer(options);
+  }
+
+  async answer(offerId: string, offerSdp: string, options: PeerOptions): Promise<void> {
+    const { AnsweringState } = await import('./answering-state.js');
+    this.peer.setState(new AnsweringState(this.peer));
+    return this.peer.state.answer(offerId, offerSdp, options);
+  }
+}

src/peer/index.ts

@@ -0,0 +1,237 @@
+import { RondevuOffers } from '../offers.js';
+import { EventEmitter } from '../event-emitter.js';
+import type { PeerOptions, PeerEvents } from './types.js';
+import { PeerState } from './state.js';
+import { IdleState } from './idle-state.js';
+import { CreatingOfferState } from './creating-offer-state.js';
+import { WaitingForAnswerState } from './waiting-for-answer-state.js';
+import { AnsweringState } from './answering-state.js';
+import { ExchangingIceState } from './exchanging-ice-state.js';
+import { ConnectedState } from './connected-state.js';
+import { FailedState } from './failed-state.js';
+import { ClosedState } from './closed-state.js';
+
+// Re-export types for external consumers
+export type { PeerTimeouts, PeerOptions, PeerEvents } from './types.js';
+
+/**
+ * High-level WebRTC peer connection manager with state-based lifecycle
+ * Handles offer/answer exchange, ICE candidates, timeouts, and error recovery
+ */
+export default class RondevuPeer extends EventEmitter<PeerEvents> {
+  pc: RTCPeerConnection;
+  offersApi: RondevuOffers;
+  offerId?: string;
+  role?: 'offerer' | 'answerer';
+
+  // WebRTC polyfills for Node.js compatibility
+  RTCPeerConnection: typeof RTCPeerConnection;
+  RTCSessionDescription: typeof RTCSessionDescription;
+  RTCIceCandidate: typeof RTCIceCandidate;
+
+  private _state: PeerState;
+
+  // Event handler references for cleanup
+  private connectionStateChangeHandler?: () => void;
+  private dataChannelHandler?: (event: RTCDataChannelEvent) => void;
+  private trackHandler?: (event: RTCTrackEvent) => void;
+  private iceCandidateErrorHandler?: (event: Event) => void;
+
+  /**
+   * Current connection state name
+   */
+  get stateName(): string {
+    return this._state.name;
+  }
+
+  /**
+   * Current state object (internal use)
+   */
+  get state(): PeerState {
+    return this._state;
+  }
+
+  /**
+   * RTCPeerConnection state
+   */
+  get connectionState(): RTCPeerConnectionState {
+    return this.pc.connectionState;
+  }
+
+  constructor(
+    offersApi: RondevuOffers,
+    rtcConfig: RTCConfiguration = {
+      iceServers: [
+        { urls: 'stun:stun.l.google.com:19302' },
+        { urls: 'stun:stun1.l.google.com:19302' }
+      ]
+    },
+    existingPeerConnection?: RTCPeerConnection,
+    rtcPeerConnection?: typeof RTCPeerConnection,
+    rtcSessionDescription?: typeof RTCSessionDescription,
+    rtcIceCandidate?: typeof RTCIceCandidate
+  ) {
+    super();
+    this.offersApi = offersApi;
+
+    // Use provided polyfills or fall back to globals
+    this.RTCPeerConnection = rtcPeerConnection || (typeof globalThis.RTCPeerConnection !== 'undefined'
+      ? globalThis.RTCPeerConnection
+      : (() => {
+          throw new Error('RTCPeerConnection is not available. Please provide it in the Rondevu constructor options for Node.js environments.');
+        }) as any);
+
+    this.RTCSessionDescription = rtcSessionDescription || (typeof globalThis.RTCSessionDescription !== 'undefined'
+      ? globalThis.RTCSessionDescription
+      : (() => {
+          throw new Error('RTCSessionDescription is not available. Please provide it in the Rondevu constructor options for Node.js environments.');
+        }) as any);
+
+    this.RTCIceCandidate = rtcIceCandidate || (typeof globalThis.RTCIceCandidate !== 'undefined'
+      ? globalThis.RTCIceCandidate
+      : (() => {
+          throw new Error('RTCIceCandidate is not available. Please provide it in the Rondevu constructor options for Node.js environments.');
+        }) as any);
+
+    // Use existing peer connection if provided, otherwise create new one
+    this.pc = existingPeerConnection || new this.RTCPeerConnection(rtcConfig);
+    this._state = new IdleState(this);
+
+    this.setupPeerConnection();
+  }
+
+  /**
+   * Set up peer connection event handlers
+   */
+  private setupPeerConnection(): void {
+    this.connectionStateChangeHandler = () => {
+      console.log(`🔌 Connection state changed: ${this.pc.connectionState}`);
+      switch (this.pc.connectionState) {
+        case 'connected':
+          console.log('✅ WebRTC connection established');
+          this.setState(new ConnectedState(this));
+          this.emitEvent('connected');
+          break;
+        case 'disconnected':
+          console.log('⚠️ WebRTC connection disconnected');
+          this.emitEvent('disconnected');
+          break;
+        case 'failed':
+          console.log('❌ WebRTC connection failed');
+          this.setState(new FailedState(this, new Error('Connection failed')));
+          break;
+        case 'closed':
+          console.log('🔒 WebRTC connection closed');
+          this.setState(new ClosedState(this));
+          this.emitEvent('disconnected');
+          break;
+      }
+    };
+    this.pc.addEventListener('connectionstatechange', this.connectionStateChangeHandler);
+
+    // Add ICE connection state logging
+    const iceConnectionStateHandler = () => {
+      console.log(`🧊 ICE connection state: ${this.pc.iceConnectionState}`);
+    };
+    this.pc.addEventListener('iceconnectionstatechange', iceConnectionStateHandler);
+
+    // Add ICE gathering state logging
+    const iceGatheringStateHandler = () => {
+      console.log(`🔍 ICE gathering state: ${this.pc.iceGatheringState}`);
+    };
+    this.pc.addEventListener('icegatheringstatechange', iceGatheringStateHandler);
+
+    this.dataChannelHandler = (event: RTCDataChannelEvent) => {
+      this.emitEvent('datachannel', event.channel);
+    };
+    this.pc.addEventListener('datachannel', this.dataChannelHandler);
+
+    this.trackHandler = (event: RTCTrackEvent) => {
+      this.emitEvent('track', event);
+    };
+    this.pc.addEventListener('track', this.trackHandler);
+
+    this.iceCandidateErrorHandler = (event: Event) => {
+      const iceError = event as RTCPeerConnectionIceErrorEvent;
+      console.error(`❌ ICE candidate error: ${iceError.errorText || 'Unknown error'}`, {
+        errorCode: iceError.errorCode,
+        url: iceError.url,
+        address: iceError.address,
+        port: iceError.port
+      });
+    };
+    this.pc.addEventListener('icecandidateerror', this.iceCandidateErrorHandler);
+  }
+
+  /**
+   * Set new state and emit state change event
+   */
+  setState(newState: PeerState): void {
+    this._state.cleanup();
+    this._state = newState;
+    this.emitEvent('state', newState.name);
+  }
+
+  /**
+   * Emit event (exposed for PeerState classes)
+   * @internal
+   */
+  emitEvent<K extends keyof PeerEvents>(
+    event: K,
+    ...args: Parameters<PeerEvents[K]>
+  ): void {
+    this.emit(event, ...args);
+  }
+
+  /**
+   * Create an offer and advertise on topics
+   */
+  async createOffer(options: PeerOptions): Promise<string> {
+    return this._state.createOffer(options);
+  }
+
+  /**
+   * Answer an existing offer
+   */
+  async answer(offerId: string, offerSdp: string, options: PeerOptions): Promise<void> {
+    return this._state.answer(offerId, offerSdp, options);
+  }
+
+  /**
+   * Add a media track to the connection
+   */
+  addTrack(track: MediaStreamTrack, ...streams: MediaStream[]): RTCRtpSender {
+    return this.pc.addTrack(track, ...streams);
+  }
+
+  /**
+   * Create a data channel for sending and receiving arbitrary data
+   * This should typically be called by the offerer before creating the offer
+   * The answerer will receive the channel via the 'datachannel' event
+   */
+  createDataChannel(label: string, options?: RTCDataChannelInit): RTCDataChannel {
+    return this.pc.createDataChannel(label, options);
+  }
+
+  /**
+   * Close the connection and clean up
+   */
+  async close(): Promise<void> {
+    // Remove RTCPeerConnection event listeners
+    if (this.connectionStateChangeHandler) {
+      this.pc.removeEventListener('connectionstatechange', this.connectionStateChangeHandler);
+    }
+    if (this.dataChannelHandler) {
+      this.pc.removeEventListener('datachannel', this.dataChannelHandler);
+    }
+    if (this.trackHandler) {
+      this.pc.removeEventListener('track', this.trackHandler);
+    }
+    if (this.iceCandidateErrorHandler) {
+      this.pc.removeEventListener('icecandidateerror', this.iceCandidateErrorHandler);
+    }
+
+    await this._state.close();
+    this.removeAllListeners();
+  }
+}

src/peer/state.ts

@@ -0,0 +1,73 @@
+import type { PeerOptions } from './types.js';
+import type RondevuPeer from './index.js';
+
+/**
+ * Base class for peer connection states
+ * Implements the State pattern for managing WebRTC connection lifecycle
+ */
+export abstract class PeerState {
+  protected iceCandidateHandler?: (event: RTCPeerConnectionIceEvent) => void;
+
+  constructor(protected peer: RondevuPeer) {}
+
+  abstract get name(): string;
+
+  async createOffer(options: PeerOptions): Promise<string> {
+    throw new Error(`Cannot create offer in ${this.name} state`);
+  }
+
+  async answer(offerId: string, offerSdp: string, options: PeerOptions): Promise<void> {
+    throw new Error(`Cannot answer in ${this.name} state`);
+  }
+
+  async handleAnswer(sdp: string): Promise<void> {
+    throw new Error(`Cannot handle answer in ${this.name} state`);
+  }
+
+  async handleIceCandidate(candidate: any): Promise<void> {
+    // ICE candidates can arrive in multiple states, so default is to add them
+    if (this.peer.pc.remoteDescription) {
+      await this.peer.pc.addIceCandidate(new this.peer.RTCIceCandidate(candidate));
+    }
+  }
+
+  /**
+   * Setup trickle ICE candidate handler
+   * Sends local ICE candidates to server as they are discovered
+   */
+  protected setupIceCandidateHandler(): void {
+    this.iceCandidateHandler = async (event: RTCPeerConnectionIceEvent) => {
+      if (event.candidate && this.peer.offerId) {
+        const candidateData = event.candidate.toJSON();
+        if (candidateData.candidate && candidateData.candidate !== '') {
+          const type = candidateData.candidate.includes('typ host') ? 'host' :
+                       candidateData.candidate.includes('typ srflx') ? 'srflx' :
+                       candidateData.candidate.includes('typ relay') ? 'relay' : 'unknown';
+          console.log(`🧊 Generated ${type} ICE candidate:`, candidateData.candidate);
+          try {
+            await this.peer.offersApi.addIceCandidates(this.peer.offerId, [candidateData]);
+            console.log(`✅ Sent ${type} ICE candidate to server`);
+          } catch (err) {
+            console.error(`❌ Error sending ${type} ICE candidate:`, err);
+          }
+        }
+      } else if (!event.candidate) {
+        console.log('🧊 ICE gathering complete (null candidate)');
+      }
+    };
+    this.peer.pc.addEventListener('icecandidate', this.iceCandidateHandler);
+  }
+
+  cleanup(): void {
+    // Clean up ICE candidate handler if it exists
+    if (this.iceCandidateHandler) {
+      this.peer.pc.removeEventListener('icecandidate', this.iceCandidateHandler);
+    }
+  }
+
+  async close(): Promise<void> {
+    this.cleanup();
+    const { ClosedState } = await import('./closed-state.js');
+    this.peer.setState(new ClosedState(this.peer));
+  }
+}

src/peer/types.ts

@@ -0,0 +1,45 @@
+/**
+ * Timeout configurations for different connection phases
+ */
+export interface PeerTimeouts {
+  /** Timeout for ICE gathering (default: 10000ms) */
+  iceGathering?: number;
+  /** Timeout for waiting for answer (default: 30000ms) */
+  waitingForAnswer?: number;
+  /** Timeout for creating answer (default: 10000ms) */
+  creatingAnswer?: number;
+  /** Timeout for ICE connection (default: 30000ms) */
+  iceConnection?: number;
+}
+
+/**
+ * Options for creating a peer connection
+ */
+export interface PeerOptions {
+  /** RTCConfiguration for the peer connection */
+  rtcConfig?: RTCConfiguration;
+  /** Topics to advertise this connection under */
+  topics: string[];
+  /** How long the offer should live (milliseconds) */
+  ttl?: number;
+  /** Optional secret to protect the offer (max 128 characters) */
+  secret?: string;
+  /** Whether to create a data channel automatically (for offerer) */
+  createDataChannel?: boolean;
+  /** Label for the automatically created data channel */
+  dataChannelLabel?: string;
+  /** Timeout configurations */
+  timeouts?: PeerTimeouts;
+}
+
+/**
+ * Events emitted by RondevuPeer
+ */
+export interface PeerEvents extends Record<string, (...args: any[]) => void> {
+  'state': (state: string) => void;
+  'connected': () => void;
+  'disconnected': () => void;
+  'failed': (error: Error) => void;
+  'datachannel': (channel: RTCDataChannel) => void;
+  'track': (event: RTCTrackEvent) => void;
+}

src/peer/waiting-for-answer-state.ts

@@ -0,0 +1,78 @@
+import { PeerState } from './state.js';
+import type { PeerOptions } from './types.js';
+import type RondevuPeer from './index.js';
+
+/**
+ * Waiting for answer from another peer
+ */
+export class WaitingForAnswerState extends PeerState {
+  private pollingInterval?: ReturnType<typeof setInterval>;
+  private timeout?: ReturnType<typeof setTimeout>;
+
+  constructor(
+    peer: RondevuPeer,
+    private offerId: string,
+    private options: PeerOptions
+  ) {
+    super(peer);
+    this.startPolling();
+  }
+
+  get name() { return 'waiting-for-answer'; }
+
+  private startPolling(): void {
+    const answerTimeout = this.options.timeouts?.waitingForAnswer || 30000;
+
+    this.timeout = setTimeout(async () => {
+      this.cleanup();
+      const { FailedState } = await import('./failed-state.js');
+      this.peer.setState(new FailedState(
+        this.peer,
+        new Error('Timeout waiting for answer')
+      ));
+    }, answerTimeout);
+
+    this.pollingInterval = setInterval(async () => {
+      try {
+        const answers = await this.peer.offersApi.getAnswers();
+        const myAnswer = answers.find((a: any) => a.offerId === this.offerId);
+
+        if (myAnswer) {
+          this.cleanup();
+          await this.handleAnswer(myAnswer.sdp);
+        }
+      } catch (err) {
+        console.error('Error polling for answers:', err);
+        if (err instanceof Error && err.message.includes('not found')) {
+          this.cleanup();
+          const { FailedState } = await import('./failed-state.js');
+          this.peer.setState(new FailedState(
+            this.peer,
+            new Error('Offer expired or not found')
+          ));
+        }
+      }
+    }, 2000);
+  }
+
+  async handleAnswer(sdp: string): Promise<void> {
+    try {
+      await this.peer.pc.setRemoteDescription({
+        type: 'answer',
+        sdp
+      });
+
+      // Transition to exchanging ICE
+      const { ExchangingIceState } = await import('./exchanging-ice-state.js');
+      this.peer.setState(new ExchangingIceState(this.peer, this.offerId, this.options));
+    } catch (error) {
+      const { FailedState } = await import('./failed-state.js');
+      this.peer.setState(new FailedState(this.peer, error as Error));
+    }
+  }
+
+  cleanup(): void {
+    if (this.pollingInterval) clearInterval(this.pollingInterval);
+    if (this.timeout) clearTimeout(this.timeout);
+  }
+}

src/rondevu.ts

@@ -1,273 +1,296 @@
-import { RondevuClient } from './client';
-import { RondevuConnection } from './connection';
-import { RondevuOptions, JoinOptions, RondevuConnectionParams } from './types';
+import { RondevuAuth, Credentials, FetchFunction } from './auth.js';
+import { RondevuOffers } from './offers.js';
+import { RondevuUsername } from './usernames.js';
+import RondevuPeer from './peer/index.js';
+import { DurableService } from './durable/service.js';
+import { DurableConnection } from './durable/connection.js';
+import { DurableChannel } from './durable/channel.js';
+import type {
+  DurableServiceConfig,
+  DurableConnectionConfig,
+  ConnectionInfo
+} from './durable/types.js';
+
+export interface RondevuOptions {
+  /**
+   * Base URL of the Rondevu server
+   * @default 'https://api.ronde.vu'
+   */
+  baseUrl?: string;
+
+  /**
+   * Existing credentials (peerId + secret) to skip registration
+   */
+  credentials?: Credentials;
+
+  /**
+   * Custom fetch implementation for environments without native fetch
+   * (Node.js < 18, some Workers environments, etc.)
+   *
+   * @example Node.js
+   * ```typescript
+   * import fetch from 'node-fetch';
+   * const client = new Rondevu({ fetch });
+   * ```
+   */
+  fetch?: FetchFunction;
+
+  /**
+   * Custom RTCPeerConnection implementation for Node.js environments
+   * Required when using in Node.js with wrtc or similar polyfills
+   *
+   * @example Node.js with wrtc
+   * ```typescript
+   * import { RTCPeerConnection } from 'wrtc';
+   * const client = new Rondevu({ RTCPeerConnection });
+   * ```
+   */
+  RTCPeerConnection?: typeof RTCPeerConnection;
+
+  /**
+   * Custom RTCSessionDescription implementation for Node.js environments
+   * Required when using in Node.js with wrtc or similar polyfills
+   *
+   * @example Node.js with wrtc
+   * ```typescript
+   * import { RTCSessionDescription } from 'wrtc';
+   * const client = new Rondevu({ RTCSessionDescription });
+   * ```
+   */
+  RTCSessionDescription?: typeof RTCSessionDescription;
+
+  /**
+   * Custom RTCIceCandidate implementation for Node.js environments
+   * Required when using in Node.js with wrtc or similar polyfills
+   *
+   * @example Node.js with wrtc
+   * ```typescript
+   * import { RTCIceCandidate } from 'wrtc';
+   * const client = new Rondevu({ RTCIceCandidate });
+   * ```
+   */
+  RTCIceCandidate?: typeof RTCIceCandidate;
+}
 
-/**
- * Main Rondevu WebRTC client with automatic connection management
- */
 export class Rondevu {
-  readonly peerId: string;
+  readonly auth: RondevuAuth;
+  readonly usernames: RondevuUsername;
 
-  private client: RondevuClient;
+  private _offers?: RondevuOffers;
+  private credentials?: Credentials;
   private baseUrl: string;
-  private fetchImpl?: typeof fetch;
-  private rtcConfig?: RTCConfiguration;
-  private pollingInterval: number;
-  private connectionTimeout: number;
+  private fetchFn?: FetchFunction;
+  private rtcPeerConnection?: typeof RTCPeerConnection;
+  private rtcSessionDescription?: typeof RTCSessionDescription;
+  private rtcIceCandidate?: typeof RTCIceCandidate;
 
-  /**
-   * Creates a new Rondevu client instance
-   * @param options - Client configuration options
-   */
   constructor(options: RondevuOptions = {}) {
-    this.baseUrl = options.baseUrl || 'https://rondevu.xtrdev.workers.dev';
-    this.fetchImpl = options.fetch;
+    this.baseUrl = options.baseUrl || 'https://api.ronde.vu';
+    this.fetchFn = options.fetch;
+    this.rtcPeerConnection = options.RTCPeerConnection;
+    this.rtcSessionDescription = options.RTCSessionDescription;
+    this.rtcIceCandidate = options.RTCIceCandidate;
 
-    this.client = new RondevuClient({
-      baseUrl: this.baseUrl,
-      fetch: options.fetch,
-    });
+    this.auth = new RondevuAuth(this.baseUrl, this.fetchFn);
+    this.usernames = new RondevuUsername(this.baseUrl);
 
-    // Auto-generate peer ID if not provided
-    this.peerId = options.peerId || this.generatePeerId();
-    this.rtcConfig = options.rtcConfig;
-    this.pollingInterval = options.pollingInterval || 1000;
-    this.connectionTimeout = options.connectionTimeout || 30000;
-  }
-
-  /**
-   * Generate a unique peer ID
-   */
-  private generatePeerId(): string {
-    return `rdv_${Math.random().toString(36).substring(2, 14)}`;
-  }
-
-  /**
-   * Update the peer ID (useful when user identity changes)
-   */
-  updatePeerId(newPeerId: string): void {
-    (this as any).peerId = newPeerId;
-  }
-
-  /**
-   * Create a new connection (offerer role)
-   * @param id - Connection identifier
-   * @param topic - Topic name for grouping connections
-   * @returns Promise that resolves to RondevuConnection
-   */
-  async create(id: string, topic: string): Promise<RondevuConnection> {
-    // Create peer connection
-    const pc = new RTCPeerConnection(this.rtcConfig);
-
-    // Create initial data channel for negotiation (required for offer creation)
-    pc.createDataChannel('_negotiation');
-
-    // Generate offer
-    const offer = await pc.createOffer();
-    await pc.setLocalDescription(offer);
-
-    // Wait for ICE gathering to complete
-    await this.waitForIceGathering(pc);
-
-    // Create session on server with custom code
-    await this.client.createOffer(topic, {
-      peerId: this.peerId,
-      offer: pc.localDescription!.sdp,
-      code: id,
-    });
-
-    // Create connection object
-    const connectionParams: RondevuConnectionParams = {
-      id,
-      topic,
-      role: 'offerer',
-      pc,
-      localPeerId: this.peerId,
-      remotePeerId: '', // Will be populated when answer is received
-      pollingInterval: this.pollingInterval,
-      connectionTimeout: this.connectionTimeout,
-    };
-
-    const connection = new RondevuConnection(connectionParams, this.client);
-
-    // Start polling for answer
-    connection.startPolling();
-
-    return connection;
-  }
-
-  /**
-   * Connect to an existing connection by ID (answerer role)
-   * @param id - Connection identifier
-   * @returns Promise that resolves to RondevuConnection
-   */
-  async connect(id: string): Promise<RondevuConnection> {
-    // Poll server to get session by ID
-    const sessionData = await this.findSessionByIdWithClient(id, this.client);
-
-    if (!sessionData) {
-      throw new Error(`Connection ${id} not found or expired`);
+    if (options.credentials) {
+      this.credentials = options.credentials;
+      this._offers = new RondevuOffers(this.baseUrl, this.credentials, this.fetchFn);
     }
-
-    // Create peer connection
-    const pc = new RTCPeerConnection(this.rtcConfig);
-
-    // Set remote offer
-    await pc.setRemoteDescription({
-      type: 'offer',
-      sdp: sessionData.offer,
-    });
-
-    // Generate answer
-    const answer = await pc.createAnswer();
-    await pc.setLocalDescription(answer);
-
-    // Wait for ICE gathering
-    await this.waitForIceGathering(pc);
-
-    // Send answer to server
-    await this.client.sendAnswer({
-      code: id,
-      answer: pc.localDescription!.sdp,
-      side: 'answerer',
-    });
-
-    // Create connection object
-    const connectionParams: RondevuConnectionParams = {
-      id,
-      topic: sessionData.topic || 'unknown',
-      role: 'answerer',
-      pc,
-      localPeerId: this.peerId,
-      remotePeerId: sessionData.peerId,
-      pollingInterval: this.pollingInterval,
-      connectionTimeout: this.connectionTimeout,
-    };
-
-    const connection = new RondevuConnection(connectionParams, this.client);
-
-    // Start polling for ICE candidates
-    connection.startPolling();
-
-    return connection;
   }
 
   /**
-   * Join a topic and discover available peers (answerer role)
-   * @param topic - Topic name
-   * @param options - Optional join options for filtering and selection
-   * @returns Promise that resolves to RondevuConnection
+   * Get offers API (low-level access, requires authentication)
+   * For most use cases, use the durable connection APIs instead
    */
-  async join(topic: string, options?: JoinOptions): Promise<RondevuConnection> {
-    // List sessions in topic
-    const { sessions } = await this.client.listSessions(topic);
+  get offers(): RondevuOffers {
+    if (!this._offers) {
+      throw new Error('Not authenticated. Call register() first or provide credentials.');
+    }
+    return this._offers;
+  }
 
-    // Filter out self (sessions with our peer ID)
-    let availableSessions = sessions.filter(
-      session => session.peerId !== this.peerId
+  /**
+   * Register and initialize authenticated client
+   * Generates a cryptographically random peer ID (128-bit)
+   */
+  async register(): Promise<Credentials> {
+    this.credentials = await this.auth.register();
+
+    // Create offers API instance
+    this._offers = new RondevuOffers(
+      this.baseUrl,
+      this.credentials,
+      this.fetchFn
     );
 
-    // Apply custom filter if provided
-    if (options?.filter) {
-      availableSessions = availableSessions.filter(options.filter);
+    return this.credentials;
+  }
+
+  /**
+   * Check if client is authenticated
+   */
+  isAuthenticated(): boolean {
+    return !!this.credentials;
+  }
+
+  /**
+   * Get current credentials
+   */
+  getCredentials(): Credentials | undefined {
+    return this.credentials;
+  }
+
+  /**
+   * Create a new WebRTC peer connection (requires authentication)
+   * This is a high-level helper that creates and manages WebRTC connections with state management
+   *
+   * @param rtcConfig Optional RTCConfiguration for the peer connection
+   * @returns RondevuPeer instance
+   */
+  createPeer(rtcConfig?: RTCConfiguration): RondevuPeer {
+    if (!this._offers) {
+      throw new Error('Not authenticated. Call register() first or provide credentials.');
     }
 
-    if (availableSessions.length === 0) {
-      throw new Error(`No available peers in topic: ${topic}`);
+    return new RondevuPeer(
+      this._offers,
+      rtcConfig,
+      undefined, // No existing peer connection
+      this.rtcPeerConnection,
+      this.rtcSessionDescription,
+      this.rtcIceCandidate
+    );
+  }
+
+  /**
+   * Expose a durable service with automatic reconnection and TTL refresh
+   *
+   * Creates a service that handles incoming connections with automatic
+   * reconnection and message queuing during network interruptions.
+   *
+   * @param config Service configuration
+   * @returns DurableService instance
+   *
+   * @example
+   * ```typescript
+   * const service = await client.exposeService({
+   *   username: 'alice',
+   *   privateKey: keypair.privateKey,
+   *   serviceFqn: 'chat@1.0.0',
+   *   poolSize: 10,
+   *   handler: (channel, connectionId) => {
+   *     channel.on('message', (data) => {
+   *       console.log('Received:', data);
+   *       channel.send(`Echo: ${data}`);
+   *     });
+   *   }
+   * });
+   *
+   * await service.start();
+   * ```
+   */
+  async exposeService(
+    config: DurableServiceConfig & {
+      handler: (channel: DurableChannel, connectionId: string) => void | Promise<void>;
+    }
+  ): Promise<DurableService> {
+    if (!this._offers || !this.credentials) {
+      throw new Error('Not authenticated. Call register() first or provide credentials.');
     }
 
-    // Select session based on strategy
-    const selectedSession = this.selectSession(
-      availableSessions,
-      options?.select || 'first'
+    const service = new DurableService(
+      this._offers,
+      this.baseUrl,
+      this.credentials,
+      config.handler,
+      config
     );
 
-    // Connect to selected session
-    return this.connect(selectedSession.code);
+    return service;
   }
 
   /**
-   * Select a session based on strategy
+   * Create a durable connection to a service by username and service FQN
+   *
+   * Establishes a WebRTC connection with automatic reconnection and
+   * message queuing during network interruptions.
+   *
+   * @param username Username of the service provider
+   * @param serviceFqn Fully qualified service name
+   * @param config Optional connection configuration
+   * @returns DurableConnection instance
+   *
+   * @example
+   * ```typescript
+   * const connection = await client.connect('alice', 'chat@1.0.0', {
+   *   maxReconnectAttempts: 5
+   * });
+   *
+   * const channel = connection.createChannel('main');
+   * channel.on('message', (data) => {
+   *   console.log('Received:', data);
+   * });
+   *
+   * await connection.connect();
+   * channel.send('Hello!');
+   * ```
    */
-  private selectSession(
-    sessions: Array<{ code: string; peerId: string; createdAt: number }>,
-    strategy: 'first' | 'newest' | 'oldest' | 'random'
-  ): { code: string; peerId: string; createdAt: number } {
-    switch (strategy) {
-      case 'first':
-        return sessions[0];
-      case 'newest':
-        return sessions.reduce((newest, session) =>
-          session.createdAt > newest.createdAt ? session : newest
-        );
-      case 'oldest':
-        return sessions.reduce((oldest, session) =>
-          session.createdAt < oldest.createdAt ? session : oldest
-        );
-      case 'random':
-        return sessions[Math.floor(Math.random() * sessions.length)];
-      default:
-        return sessions[0];
+  async connect(
+    username: string,
+    serviceFqn: string,
+    config?: DurableConnectionConfig
+  ): Promise<DurableConnection> {
+    if (!this._offers) {
+      throw new Error('Not authenticated. Call register() first or provide credentials.');
     }
+
+    const connectionInfo: ConnectionInfo = {
+      username,
+      serviceFqn
+    };
+
+    return new DurableConnection(this._offers, connectionInfo, config);
   }
 
   /**
-   * Wait for ICE gathering to complete
+   * Create a durable connection to a service by UUID
+   *
+   * Establishes a WebRTC connection with automatic reconnection and
+   * message queuing during network interruptions.
+   *
+   * @param uuid Service UUID
+   * @param config Optional connection configuration
+   * @returns DurableConnection instance
+   *
+   * @example
+   * ```typescript
+   * const connection = await client.connectByUuid('service-uuid-here', {
+   *   maxReconnectAttempts: 5
+   * });
+   *
+   * const channel = connection.createChannel('main');
+   * channel.on('message', (data) => {
+   *   console.log('Received:', data);
+   * });
+   *
+   * await connection.connect();
+   * channel.send('Hello!');
+   * ```
    */
-  private async waitForIceGathering(pc: RTCPeerConnection): Promise<void> {
-    if (pc.iceGatheringState === 'complete') {
-      return;
+  async connectByUuid(
+    uuid: string,
+    config?: DurableConnectionConfig
+  ): Promise<DurableConnection> {
+    if (!this._offers) {
+      throw new Error('Not authenticated. Call register() first or provide credentials.');
     }
 
-    return new Promise((resolve) => {
-      const checkState = () => {
-        if (pc.iceGatheringState === 'complete') {
-          pc.removeEventListener('icegatheringstatechange', checkState);
-          resolve();
-        }
-      };
+    const connectionInfo: ConnectionInfo = {
+      uuid
+    };
 
-      pc.addEventListener('icegatheringstatechange', checkState);
-
-      // Also set a timeout in case gathering takes too long
-      setTimeout(() => {
-        pc.removeEventListener('icegatheringstatechange', checkState);
-        resolve();
-      }, 5000);
-    });
-  }
-
-  /**
-   * Find a session by connection ID
-   * This requires polling since we don't know which topic it's in
-   */
-  private async findSessionByIdWithClient(
-    id: string,
-    client: RondevuClient
-  ): Promise<{
-    code: string;
-    peerId: string;
-    offer: string;
-    topic?: string;
-  } | null> {
-    try {
-      // Try to poll for the session directly
-      // The poll endpoint should return the session data
-      const response = await client.poll(id, 'answerer');
-      const answererResponse = response as { offer: string; offerCandidates: string[] };
-
-      if (answererResponse.offer) {
-        return {
-          code: id,
-          peerId: '', // Will be populated from session data
-          offer: answererResponse.offer,
-          topic: undefined,
-        };
-      }
-
-      return null;
-    } catch (err) {
-      throw new Error(`Failed to find session ${id}: ${(err as Error).message}`);
-    }
+    return new DurableConnection(this._offers, connectionInfo, config);
   }
 }

src/service-pool.ts

@@ -0,0 +1,664 @@
+import { RondevuOffers, Offer } from './offers.js';
+import { RondevuUsername } from './usernames.js';
+import RondevuPeer from './peer/index.js';
+import { OfferPool, AnsweredOffer } from './offer-pool.js';
+
+/**
+ * Connection information for tracking active connections
+ */
+interface ConnectionInfo {
+  peer: RondevuPeer;
+  channel: RTCDataChannel;
+  connectedAt: number;
+  offerId: string;
+}
+
+/**
+ * Status information about the pool
+ */
+export interface PoolStatus {
+  /** Number of active offers in the pool */
+  activeOffers: number;
+
+  /** Number of currently connected peers */
+  activeConnections: number;
+
+  /** Total number of connections handled since start */
+  totalConnectionsHandled: number;
+
+  /** Number of failed offer creation attempts */
+  failedOfferCreations: number;
+}
+
+/**
+ * Configuration options for a pooled service
+ */
+export interface ServicePoolOptions {
+  /** Username that owns the service */
+  username: string;
+
+  /** Private key for signing service operations */
+  privateKey: string;
+
+  /** Fully qualified service name (e.g., com.example.chat@1.0.0) */
+  serviceFqn: string;
+
+  /** WebRTC configuration */
+  rtcConfig?: RTCConfiguration;
+
+  /** Whether the service is publicly discoverable */
+  isPublic?: boolean;
+
+  /** Optional metadata for the service */
+  metadata?: Record<string, any>;
+
+  /** Time-to-live for offers in milliseconds */
+  ttl?: number;
+
+  /** Handler invoked for each new connection */
+  handler: (channel: RTCDataChannel, peer: RondevuPeer, connectionId: string) => void;
+
+  /** Number of simultaneous open offers to maintain (default: 1) */
+  poolSize?: number;
+
+  /** Polling interval in milliseconds (default: 2000ms) */
+  pollingInterval?: number;
+
+  /** Callback for pool status updates */
+  onPoolStatus?: (status: PoolStatus) => void;
+
+  /** Error handler for pool operations */
+  onError?: (error: Error, context: string) => void;
+}
+
+/**
+ * Service handle with pool-specific methods
+ */
+export interface PooledServiceHandle {
+  /** Service ID */
+  serviceId: string;
+
+  /** Service UUID */
+  uuid: string;
+
+  /** Offer ID */
+  offerId: string;
+
+  /** Unpublish the service */
+  unpublish: () => Promise<void>;
+
+  /** Get current pool status */
+  getStatus: () => PoolStatus;
+
+  /** Manually add offers to the pool */
+  addOffers: (count: number) => Promise<void>;
+}
+
+/**
+ * Manages a pooled service with multiple concurrent connections
+ *
+ * ServicePool coordinates offer creation, answer polling, and connection
+ * management for services that need to handle multiple simultaneous connections.
+ */
+export class ServicePool {
+  private offerPool?: OfferPool;
+  private connections: Map<string, ConnectionInfo> = new Map();
+  private peerConnections: Map<string, RTCPeerConnection> = new Map();
+  private status: PoolStatus = {
+    activeOffers: 0,
+    activeConnections: 0,
+    totalConnectionsHandled: 0,
+    failedOfferCreations: 0
+  };
+  private serviceId?: string;
+  private uuid?: string;
+  private offersApi: RondevuOffers;
+  private usernameApi: RondevuUsername;
+
+  constructor(
+    private baseUrl: string,
+    private credentials: { peerId: string; secret: string },
+    private options: ServicePoolOptions
+  ) {
+    this.offersApi = new RondevuOffers(baseUrl, credentials);
+    this.usernameApi = new RondevuUsername(baseUrl);
+  }
+
+  /**
+   * Start the pooled service
+   */
+  async start(): Promise<PooledServiceHandle> {
+    const poolSize = this.options.poolSize || 1;
+
+    // 1. Create initial service (publishes first offer)
+    const service = await this.publishInitialService();
+    this.serviceId = service.serviceId;
+    this.uuid = service.uuid;
+
+    // 2. Create additional offers for pool (poolSize - 1)
+    const additionalOffers: Offer[] = [];
+    const additionalPeerConnections: RTCPeerConnection[] = [];
+    const additionalDataChannels: RTCDataChannel[] = [];
+    if (poolSize > 1) {
+      try {
+        const result = await this.createOffers(poolSize - 1);
+        additionalOffers.push(...result.offers);
+        additionalPeerConnections.push(...result.peerConnections);
+        additionalDataChannels.push(...result.dataChannels);
+      } catch (error) {
+        this.handleError(error as Error, 'initial-offer-creation');
+      }
+    }
+
+    // 3. Initialize OfferPool with all offers
+    this.offerPool = new OfferPool(this.offersApi, {
+      poolSize,
+      pollingInterval: this.options.pollingInterval || 2000,
+      onAnswered: (answer) => this.handleConnection(answer),
+      onRefill: (count) => this.createOffers(count),
+      onError: (err, ctx) => this.handleError(err, ctx)
+    });
+
+    // Add all offers to pool with their peer connections and data channels
+    const allOffers = [
+      { id: service.offerId, peerId: this.credentials.peerId, sdp: service.offerSdp, topics: [], expiresAt: service.expiresAt, lastSeen: Date.now() },
+      ...additionalOffers
+    ];
+    const allPeerConnections = [
+      service.peerConnection,
+      ...additionalPeerConnections
+    ];
+    const allDataChannels = [
+      service.dataChannel,
+      ...additionalDataChannels
+    ];
+    await this.offerPool.addOffers(allOffers, allPeerConnections, allDataChannels);
+
+    // 4. Start polling
+    await this.offerPool.start();
+
+    // Update status
+    this.updateStatus();
+
+    // 5. Return handle
+    return {
+      serviceId: this.serviceId,
+      uuid: this.uuid,
+      offerId: service.offerId,
+      unpublish: () => this.stop(),
+      getStatus: () => this.getStatus(),
+      addOffers: (count) => this.manualRefill(count)
+    };
+  }
+
+  /**
+   * Stop the pooled service and clean up
+   */
+  async stop(): Promise<void> {
+    // 1. Stop accepting new connections
+    if (this.offerPool) {
+      await this.offerPool.stop();
+    }
+
+    // 2. Close peer connections from the pool
+    if (this.offerPool) {
+      const poolPeerConnections = this.offerPool.getActivePeerConnections();
+      poolPeerConnections.forEach(pc => {
+        try {
+          pc.close();
+        } catch {
+          // Ignore errors during cleanup
+        }
+      });
+    }
+
+    // 3. Delete remaining offers
+    if (this.offerPool) {
+      const offerIds = this.offerPool.getActiveOfferIds();
+      await Promise.allSettled(
+        offerIds.map(id => this.offersApi.delete(id).catch(() => {}))
+      );
+    }
+
+    // 4. Close active connections
+    const closePromises = Array.from(this.connections.values()).map(
+      async (conn) => {
+        try {
+          // Give a brief moment for graceful closure
+          await new Promise(resolve => setTimeout(resolve, 100));
+          conn.peer.pc.close();
+        } catch {
+          // Ignore errors during cleanup
+        }
+      }
+    );
+    await Promise.allSettled(closePromises);
+
+    // 5. Delete service if we have a serviceId
+    if (this.serviceId) {
+      try {
+        const response = await fetch(`${this.baseUrl}/services/${this.serviceId}`, {
+          method: 'DELETE',
+          headers: {
+            'Content-Type': 'application/json',
+            'Authorization': `Bearer ${this.credentials.peerId}:${this.credentials.secret}`
+          },
+          body: JSON.stringify({ username: this.options.username })
+        });
+
+        if (!response.ok) {
+          console.error('Failed to delete service:', await response.text());
+        }
+      } catch (error) {
+        console.error('Error deleting service:', error);
+      }
+    }
+
+    // Clear all state
+    this.connections.clear();
+    this.offerPool = undefined;
+  }
+
+  /**
+   * Handle an answered offer by setting up the connection
+   */
+  private async handleConnection(answer: AnsweredOffer): Promise<void> {
+    const connectionId = this.generateConnectionId();
+
+    try {
+      // Use the existing peer connection from the pool
+      const peer = new RondevuPeer(
+        this.offersApi,
+        this.options.rtcConfig || {
+          iceServers: [{ urls: 'stun:stun.l.google.com:19302' }]
+        },
+        answer.peerConnection // Use the existing peer connection
+      );
+
+      peer.role = 'offerer';
+      peer.offerId = answer.offerId;
+
+      // Verify peer connection is in correct state
+      if (peer.pc.signalingState !== 'have-local-offer') {
+        console.error('Peer connection state info:', {
+          signalingState: peer.pc.signalingState,
+          connectionState: peer.pc.connectionState,
+          iceConnectionState: peer.pc.iceConnectionState,
+          iceGatheringState: peer.pc.iceGatheringState,
+          hasLocalDescription: !!peer.pc.localDescription,
+          hasRemoteDescription: !!peer.pc.remoteDescription,
+          localDescriptionType: peer.pc.localDescription?.type,
+          remoteDescriptionType: peer.pc.remoteDescription?.type,
+          offerId: answer.offerId
+        });
+        throw new Error(
+          `Invalid signaling state: ${peer.pc.signalingState}. Expected 'have-local-offer' to set remote answer.`
+        );
+      }
+
+      // Set remote description (the answer)
+      await peer.pc.setRemoteDescription({
+        type: 'answer',
+        sdp: answer.sdp
+      });
+
+      // Use the data channel we created when making the offer
+      if (!answer.dataChannel) {
+        throw new Error('No data channel found for answered offer');
+      }
+
+      const channel = answer.dataChannel;
+
+      // Wait for the channel to open (it was created when we made the offer)
+      if (channel.readyState !== 'open') {
+        await new Promise<void>((resolve, reject) => {
+          const timeout = setTimeout(
+            () => reject(new Error('Timeout waiting for data channel to open')),
+            30000
+          );
+
+          channel.onopen = () => {
+            clearTimeout(timeout);
+            resolve();
+          };
+
+          channel.onerror = (error) => {
+            clearTimeout(timeout);
+            reject(new Error('Data channel error'));
+          };
+        });
+      }
+
+      // Register connection
+      this.connections.set(connectionId, {
+        peer,
+        channel,
+        connectedAt: Date.now(),
+        offerId: answer.offerId
+      });
+
+      this.status.activeConnections++;
+      this.status.totalConnectionsHandled++;
+
+      // Setup cleanup on disconnect
+      peer.on('disconnected', () => {
+        this.connections.delete(connectionId);
+        this.status.activeConnections--;
+        this.updateStatus();
+      });
+
+      peer.on('failed', () => {
+        this.connections.delete(connectionId);
+        this.status.activeConnections--;
+        this.updateStatus();
+      });
+
+      // Update status
+      this.updateStatus();
+
+      // Invoke user handler (wrapped in try-catch)
+      try {
+        this.options.handler(channel, peer, connectionId);
+      } catch (handlerError) {
+        this.handleError(handlerError as Error, 'handler');
+      }
+
+    } catch (error) {
+      this.handleError(error as Error, 'connection-setup');
+    }
+  }
+
+  /**
+   * Create multiple offers
+   */
+  private async createOffers(count: number): Promise<{ offers: Offer[], peerConnections: RTCPeerConnection[], dataChannels: RTCDataChannel[] }> {
+    if (count <= 0) {
+      return { offers: [], peerConnections: [], dataChannels: [] };
+    }
+
+    // Server supports max 10 offers per request
+    const batchSize = Math.min(count, 10);
+    const offers: Offer[] = [];
+    const peerConnections: RTCPeerConnection[] = [];
+    const dataChannels: RTCDataChannel[] = [];
+
+    try {
+      // Create peer connections and generate offers
+      const offerRequests = [];
+      const pendingCandidates: RTCIceCandidateInit[][] = []; // Store candidates before we have offer IDs
+
+      for (let i = 0; i < batchSize; i++) {
+        const pc = new RTCPeerConnection(this.options.rtcConfig || {
+          iceServers: [{ urls: 'stun:stun.l.google.com:19302' }]
+        });
+
+        // Create data channel (required for offers) and save reference
+        const channel = pc.createDataChannel('rondevu-service');
+        dataChannels.push(channel);
+
+        // Set up temporary candidate collector BEFORE setLocalDescription
+        const candidatesForThisOffer: RTCIceCandidateInit[] = [];
+        pendingCandidates.push(candidatesForThisOffer);
+
+        pc.onicecandidate = (event) => {
+          if (event.candidate) {
+            const candidateData = event.candidate.toJSON();
+            if (candidateData.candidate && candidateData.candidate !== '') {
+              const type = candidateData.candidate.includes('typ host') ? 'host' :
+                           candidateData.candidate.includes('typ srflx') ? 'srflx' :
+                           candidateData.candidate.includes('typ relay') ? 'relay' : 'unknown';
+              console.log(`🧊 Service pool generated ${type} ICE candidate:`, candidateData.candidate);
+              candidatesForThisOffer.push(candidateData);
+            }
+          } else {
+            console.log('🧊 Service pool ICE gathering complete');
+          }
+        };
+
+        // Create offer
+        const offer = await pc.createOffer();
+        await pc.setLocalDescription(offer); // ICE gathering starts here, candidates go to collector
+
+        if (!offer.sdp) {
+          pc.close();
+          throw new Error('Failed to generate SDP');
+        }
+
+        offerRequests.push({
+          sdp: offer.sdp,
+          topics: [], // V2 doesn't use topics
+          ttl: this.options.ttl
+        });
+
+        // Keep peer connection alive - DO NOT CLOSE
+        peerConnections.push(pc);
+      }
+
+      // Batch create offers
+      const createdOffers = await this.offersApi.create(offerRequests);
+      offers.push(...createdOffers);
+
+      // Now send all pending candidates and set up handlers for future ones
+      for (let i = 0; i < peerConnections.length; i++) {
+        const pc = peerConnections[i];
+        const offerId = createdOffers[i].id;
+        const candidates = pendingCandidates[i];
+
+        // Send any candidates that were collected while waiting for offer ID
+        if (candidates.length > 0) {
+          console.log(`📤 Sending ${candidates.length} pending ICE candidate(s) for offer ${offerId}`);
+          try {
+            await this.offersApi.addIceCandidates(offerId, candidates);
+            console.log(`✅ Sent ${candidates.length} pending ICE candidate(s)`);
+          } catch (err) {
+            console.error('❌ Error sending pending ICE candidates:', err);
+          }
+        }
+
+        // Replace temporary handler with permanent one for any future candidates
+        pc.onicecandidate = async (event) => {
+          if (event.candidate) {
+            const candidateData = event.candidate.toJSON();
+            if (candidateData.candidate && candidateData.candidate !== '') {
+              const type = candidateData.candidate.includes('typ host') ? 'host' :
+                           candidateData.candidate.includes('typ srflx') ? 'srflx' :
+                           candidateData.candidate.includes('typ relay') ? 'relay' : 'unknown';
+              console.log(`🧊 Service pool generated late ${type} ICE candidate:`, candidateData.candidate);
+              try {
+                await this.offersApi.addIceCandidates(offerId, [candidateData]);
+                console.log(`✅ Sent late ${type} ICE candidate`);
+              } catch (err) {
+                console.error(`❌ Error sending ${type} ICE candidate:`, err);
+              }
+            }
+          }
+        };
+      }
+
+    } catch (error) {
+      // Close any created peer connections on error
+      peerConnections.forEach(pc => pc.close());
+      this.status.failedOfferCreations++;
+      this.handleError(error as Error, 'offer-creation');
+      throw error;
+    }
+
+    return { offers, peerConnections, dataChannels };
+  }
+
+  /**
+   * Publish the initial service (creates first offer)
+   */
+  private async publishInitialService(): Promise<{
+    serviceId: string;
+    uuid: string;
+    offerId: string;
+    offerSdp: string;
+    expiresAt: number;
+    peerConnection: RTCPeerConnection;
+    dataChannel: RTCDataChannel;
+  }> {
+    const { username, privateKey, serviceFqn, rtcConfig, isPublic, metadata, ttl } = this.options;
+
+    // Create peer connection for initial offer
+    const pc = new RTCPeerConnection(rtcConfig || {
+      iceServers: [{ urls: 'stun:stun.l.google.com:19302' }]
+    });
+
+    const dataChannel = pc.createDataChannel('rondevu-service');
+
+    // Collect candidates before we have offer ID
+    const pendingCandidates: RTCIceCandidateInit[] = [];
+
+    // Set up temporary candidate collector BEFORE setLocalDescription
+    pc.onicecandidate = (event) => {
+      if (event.candidate) {
+        const candidateData = event.candidate.toJSON();
+        if (candidateData.candidate && candidateData.candidate !== '') {
+          const type = candidateData.candidate.includes('typ host') ? 'host' :
+                       candidateData.candidate.includes('typ srflx') ? 'srflx' :
+                       candidateData.candidate.includes('typ relay') ? 'relay' : 'unknown';
+          console.log(`🧊 Initial service generated ${type} ICE candidate:`, candidateData.candidate);
+          pendingCandidates.push(candidateData);
+        }
+      } else {
+        console.log('🧊 Initial service ICE gathering complete');
+      }
+    };
+
+    // Create offer
+    const offer = await pc.createOffer();
+    await pc.setLocalDescription(offer); // ICE gathering starts here
+
+    if (!offer.sdp) {
+      pc.close();
+      throw new Error('Failed to generate SDP');
+    }
+
+    // Store the SDP
+    const offerSdp = offer.sdp;
+
+    // Create signature
+    const timestamp = Date.now();
+    const message = `publish:${username}:${serviceFqn}:${timestamp}`;
+    const signature = await this.usernameApi.signMessage(message, privateKey);
+
+    // Publish service
+    const response = await fetch(`${this.baseUrl}/services`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': `Bearer ${this.credentials.peerId}:${this.credentials.secret}`
+      },
+      body: JSON.stringify({
+        username,
+        serviceFqn,
+        sdp: offerSdp,
+        ttl,
+        isPublic,
+        metadata,
+        signature,
+        message
+      })
+    });
+
+    if (!response.ok) {
+      pc.close();
+      const error = await response.json();
+      throw new Error(error.error || 'Failed to publish service');
+    }
+
+    const data = await response.json();
+
+    // Send any pending candidates
+    if (pendingCandidates.length > 0) {
+      console.log(`📤 Sending ${pendingCandidates.length} pending ICE candidate(s) for initial service`);
+      try {
+        await this.offersApi.addIceCandidates(data.offerId, pendingCandidates);
+        console.log(`✅ Sent ${pendingCandidates.length} pending ICE candidate(s)`);
+      } catch (err) {
+        console.error('❌ Error sending pending ICE candidates:', err);
+      }
+    }
+
+    // Set up handler for any future candidates
+    pc.onicecandidate = async (event) => {
+      if (event.candidate) {
+        const candidateData = event.candidate.toJSON();
+        if (candidateData.candidate && candidateData.candidate !== '') {
+          const type = candidateData.candidate.includes('typ host') ? 'host' :
+                       candidateData.candidate.includes('typ srflx') ? 'srflx' :
+                       candidateData.candidate.includes('typ relay') ? 'relay' : 'unknown';
+          console.log(`🧊 Initial service generated late ${type} ICE candidate:`, candidateData.candidate);
+          try {
+            await this.offersApi.addIceCandidates(data.offerId, [candidateData]);
+            console.log(`✅ Sent late ${type} ICE candidate`);
+          } catch (err) {
+            console.error(`❌ Error sending ${type} ICE candidate:`, err);
+          }
+        }
+      }
+    };
+
+    return {
+      serviceId: data.serviceId,
+      uuid: data.uuid,
+      offerId: data.offerId,
+      offerSdp,
+      expiresAt: data.expiresAt,
+      peerConnection: pc, // Keep peer connection alive
+      dataChannel // Keep data channel alive
+    };
+  }
+
+  /**
+   * Manually add offers to the pool
+   */
+  private async manualRefill(count: number): Promise<void> {
+    if (!this.offerPool) {
+      throw new Error('Pool not started');
+    }
+
+    const result = await this.createOffers(count);
+    await this.offerPool.addOffers(result.offers, result.peerConnections, result.dataChannels);
+    this.updateStatus();
+  }
+
+  /**
+   * Get current pool status
+   */
+  private getStatus(): PoolStatus {
+    return { ...this.status };
+  }
+
+  /**
+   * Update status and notify listeners
+   */
+  private updateStatus(): void {
+    if (this.offerPool) {
+      this.status.activeOffers = this.offerPool.getActiveOfferCount();
+    }
+
+    if (this.options.onPoolStatus) {
+      this.options.onPoolStatus(this.getStatus());
+    }
+  }
+
+  /**
+   * Handle errors
+   */
+  private handleError(error: Error, context: string): void {
+    if (this.options.onError) {
+      this.options.onError(error, context);
+    } else {
+      console.error(`ServicePool error (${context}):`, error);
+    }
+  }
+
+  /**
+   * Generate a unique connection ID
+   */
+  private generateConnectionId(): string {
+    return `conn-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
+  }
+}

src/types.ts

@@ -1,236 +0,0 @@
-// ============================================================================
-// Signaling Types
-// ============================================================================
-
-/**
- * Session side - identifies which peer in a connection
- */
-export type Side = 'offerer' | 'answerer';
-
-/**
- * Session information returned from discovery endpoints
- */
-export interface Session {
-  /** Unique session identifier (UUID) */
-  code: string;
-  /** Peer identifier/metadata */
-  peerId: string;
-  /** Signaling data for peer connection */
-  offer: string;
-  /** Additional signaling data from offerer */
-  offerCandidates: string[];
-  /** Unix timestamp when session was created */
-  createdAt: number;
-  /** Unix timestamp when session expires */
-  expiresAt: number;
-}
-
-/**
- * Topic information with peer count
- */
-export interface TopicInfo {
-  /** Topic identifier */
-  topic: string;
-  /** Number of available peers in this topic */
-  count: number;
-}
-
-/**
- * Pagination information
- */
-export interface Pagination {
-  /** Current page number */
-  page: number;
-  /** Results per page */
-  limit: number;
-  /** Total number of results */
-  total: number;
-  /** Whether there are more results available */
-  hasMore: boolean;
-}
-
-/**
- * Response from GET / - list all topics
- */
-export interface ListTopicsResponse {
-  topics: TopicInfo[];
-  pagination: Pagination;
-}
-
-/**
- * Response from GET /:topic/sessions - list sessions in a topic
- */
-export interface ListSessionsResponse {
-  sessions: Session[];
-}
-
-/**
- * Request body for POST /:topic/offer
- */
-export interface CreateOfferRequest {
-  /** Peer identifier/metadata (max 1024 characters) */
-  peerId: string;
-  /** Signaling data for peer connection */
-  offer: string;
-  /** Optional custom connection code (if not provided, server generates UUID) */
-  code?: string;
-}
-
-/**
- * Response from POST /:topic/offer
- */
-export interface CreateOfferResponse {
-  /** Unique session identifier (UUID) */
-  code: string;
-}
-
-/**
- * Request body for POST /answer
- */
-export interface AnswerRequest {
-  /** Session UUID from the offer */
-  code: string;
-  /** Response signaling data (required if candidate not provided) */
-  answer?: string;
-  /** Additional signaling data (required if answer not provided) */
-  candidate?: string;
-  /** Which peer is sending the data */
-  side: Side;
-}
-
-/**
- * Response from POST /answer
- */
-export interface AnswerResponse {
-  success: boolean;
-}
-
-/**
- * Request body for POST /poll
- */
-export interface PollRequest {
-  /** Session UUID */
-  code: string;
-  /** Which side is polling */
-  side: Side;
-}
-
-/**
- * Response from POST /poll when side=offerer
- */
-export interface PollOffererResponse {
-  /** Answer from answerer (null if not yet received) */
-  answer: string | null;
-  /** Additional signaling data from answerer */
-  answerCandidates: string[];
-}
-
-/**
- * Response from POST /poll when side=answerer
- */
-export interface PollAnswererResponse {
-  /** Offer from offerer */
-  offer: string;
-  /** Additional signaling data from offerer */
-  offerCandidates: string[];
-}
-
-/**
- * Response from POST /poll (union type)
- */
-export type PollResponse = PollOffererResponse | PollAnswererResponse;
-
-/**
- * Response from GET / - server version information
- */
-export interface VersionResponse {
-  /** Git commit hash or version identifier */
-  version: string;
-}
-
-/**
- * Response from GET /health
- */
-export interface HealthResponse {
-  status: 'ok';
-  timestamp: number;
-}
-
-/**
- * Error response structure
- */
-export interface ErrorResponse {
-  error: string;
-}
-
-/**
- * Client configuration options
- */
-export interface RondevuClientOptions {
-  /** Base URL of the Rondevu server (e.g., 'https://example.com') */
-  baseUrl: string;
-  /** Optional fetch implementation (for Node.js environments) */
-  fetch?: typeof fetch;
-}
-
-// ============================================================================
-// WebRTC Types
-// ============================================================================
-
-/**
- * Configuration options for Rondevu WebRTC client
- */
-export interface RondevuOptions {
-  /** Base URL of the Rondevu server (defaults to 'https://rondevu.xtrdev.workers.dev') */
-  baseUrl?: string;
-  /** Peer identifier (optional, auto-generated if not provided) */
-  peerId?: string;
-  /** Optional fetch implementation (for Node.js environments) */
-  fetch?: typeof fetch;
-  /** WebRTC configuration (ICE servers, etc.) */
-  rtcConfig?: RTCConfiguration;
-  /** Polling interval in milliseconds (default: 1000) */
-  pollingInterval?: number;
-  /** Connection timeout in milliseconds (default: 30000) */
-  connectionTimeout?: number;
-}
-
-/**
- * Options for joining a topic
- */
-export interface JoinOptions {
-  /** Filter function to select specific sessions */
-  filter?: (session: { code: string; peerId: string }) => boolean;
-  /** Selection strategy for choosing a session */
-  select?: 'first' | 'newest' | 'oldest' | 'random';
-}
-
-/**
- * Connection role - whether this peer is creating or answering
- */
-export type ConnectionRole = 'offerer' | 'answerer';
-
-/**
- * Parameters for creating a RondevuConnection
- */
-export interface RondevuConnectionParams {
-  id: string;
-  topic: string;
-  role: ConnectionRole;
-  pc: RTCPeerConnection;
-  localPeerId: string;
-  remotePeerId: string;
-  pollingInterval: number;
-  connectionTimeout: number;
-}
-
-/**
- * Event map for RondevuConnection events
- */
-export interface RondevuConnectionEvents {
-  connect: () => void;
-  disconnect: () => void;
-  error: (error: Error) => void;
-  datachannel: (channel: RTCDataChannel) => void;
-  stream: (stream: MediaStream) => void;
-}

src/usernames.ts

@@ -0,0 +1,200 @@
+import * as ed25519 from '@noble/ed25519';
+
+// Set SHA-512 hash function for ed25519 (required in @noble/ed25519 v3+)
+// Uses built-in WebCrypto API which only provides async digest
+// We use the async ed25519 functions (signAsync, verifyAsync, getPublicKeyAsync)
+ed25519.hashes.sha512Async = async (message: Uint8Array) => {
+  return new Uint8Array(await crypto.subtle.digest('SHA-512', message as BufferSource));
+};
+
+/**
+ * Username claim result
+ */
+export interface UsernameClaimResult {
+  username: string;
+  publicKey: string;
+  privateKey: string;
+  claimedAt: number;
+  expiresAt: number;
+}
+
+/**
+ * Username availability check result
+ */
+export interface UsernameCheckResult {
+  username: string;
+  available: boolean;
+  claimedAt?: number;
+  expiresAt?: number;
+  publicKey?: string;
+}
+
+/**
+ * Convert Uint8Array to base64 string
+ */
+function bytesToBase64(bytes: Uint8Array): string {
+  const binString = Array.from(bytes, (byte) =>
+    String.fromCodePoint(byte)
+  ).join('');
+  return btoa(binString);
+}
+
+/**
+ * Convert base64 string to Uint8Array
+ */
+function base64ToBytes(base64: string): Uint8Array {
+  const binString = atob(base64);
+  return Uint8Array.from(binString, (char) => char.codePointAt(0)!);
+}
+
+/**
+ * Rondevu Username API
+ * Handles username claiming with Ed25519 cryptographic proof
+ */
+export class RondevuUsername {
+  constructor(private baseUrl: string) {}
+
+  /**
+   * Generates an Ed25519 keypair for username claiming
+   */
+  async generateKeypair(): Promise<{ publicKey: string; privateKey: string }> {
+    const privateKey = ed25519.utils.randomSecretKey();
+    const publicKey = await ed25519.getPublicKeyAsync(privateKey);
+
+    return {
+      publicKey: bytesToBase64(publicKey),
+      privateKey: bytesToBase64(privateKey)
+    };
+  }
+
+  /**
+   * Signs a message with an Ed25519 private key
+   */
+  async signMessage(message: string, privateKeyBase64: string): Promise<string> {
+    const privateKey = base64ToBytes(privateKeyBase64);
+    const encoder = new TextEncoder();
+    const messageBytes = encoder.encode(message);
+
+    const signature = await ed25519.signAsync(messageBytes, privateKey);
+    return bytesToBase64(signature);
+  }
+
+  /**
+   * Claims a username
+   * Generates a new keypair if one is not provided
+   */
+  async claimUsername(
+    username: string,
+    existingKeypair?: { publicKey: string; privateKey: string }
+  ): Promise<UsernameClaimResult> {
+    // Generate or use existing keypair
+    const keypair = existingKeypair || await this.generateKeypair();
+
+    // Create signed message
+    const timestamp = Date.now();
+    const message = `claim:${username}:${timestamp}`;
+    const signature = await this.signMessage(message, keypair.privateKey);
+
+    // Send claim request
+    const response = await fetch(`${this.baseUrl}/usernames/claim`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        username,
+        publicKey: keypair.publicKey,
+        signature,
+        message
+      })
+    });
+
+    if (!response.ok) {
+      const error = await response.json();
+      throw new Error(error.error || 'Failed to claim username');
+    }
+
+    const data = await response.json();
+
+    return {
+      username: data.username,
+      publicKey: keypair.publicKey,
+      privateKey: keypair.privateKey,
+      claimedAt: data.claimedAt,
+      expiresAt: data.expiresAt
+    };
+  }
+
+  /**
+   * Checks if a username is available
+   */
+  async checkUsername(username: string): Promise<UsernameCheckResult> {
+    const response = await fetch(`${this.baseUrl}/usernames/${username}`);
+
+    if (!response.ok) {
+      throw new Error('Failed to check username');
+    }
+
+    const data = await response.json();
+
+    return {
+      username: data.username,
+      available: data.available,
+      claimedAt: data.claimedAt,
+      expiresAt: data.expiresAt,
+      publicKey: data.publicKey
+    };
+  }
+
+  /**
+   * Helper: Save keypair to localStorage
+   * WARNING: This stores the private key in localStorage which is not the most secure
+   * For production use, consider using IndexedDB with encryption or hardware security modules
+   */
+  saveKeypairToStorage(username: string, publicKey: string, privateKey: string): void {
+    const data = { username, publicKey, privateKey, savedAt: Date.now() };
+    localStorage.setItem(`rondevu:keypair:${username}`, JSON.stringify(data));
+  }
+
+  /**
+   * Helper: Load keypair from localStorage
+   */
+  loadKeypairFromStorage(username: string): { publicKey: string; privateKey: string } | null {
+    const stored = localStorage.getItem(`rondevu:keypair:${username}`);
+    if (!stored) return null;
+
+    try {
+      const data = JSON.parse(stored);
+      return { publicKey: data.publicKey, privateKey: data.privateKey };
+    } catch {
+      return null;
+    }
+  }
+
+  /**
+   * Helper: Delete keypair from localStorage
+   */
+  deleteKeypairFromStorage(username: string): void {
+    localStorage.removeItem(`rondevu:keypair:${username}`);
+  }
+
+  /**
+   * Export keypair as JSON string (for backup)
+   */
+  exportKeypair(publicKey: string, privateKey: string): string {
+    return JSON.stringify({
+      publicKey,
+      privateKey,
+      exportedAt: Date.now()
+    });
+  }
+
+  /**
+   * Import keypair from JSON string
+   */
+  importKeypair(json: string): { publicKey: string; privateKey: string } {
+    const data = JSON.parse(json);
+    if (!data.publicKey || !data.privateKey) {
+      throw new Error('Invalid keypair format');
+    }
+    return { publicKey: data.publicKey, privateKey: data.privateKey };
+  }
+}