feat: update client to use service-based signaling endpoints

BREAKING CHANGE: Client API now uses service UUIDs for WebRTC signaling

- Replace answerOffer() with answerService()
- Replace getAnswer() with getServiceAnswer()
- Replace addIceCandidates() with addServiceIceCandidates()
- Replace getIceCandidates() with getServiceIceCandidates()
- Update RondevuSignaler to use service UUID instead of offer ID for signaling
- Automatically track offerId returned from service endpoints
- Bump version to 0.12.0

Matches server v0.4.0 service-based API refactor.

.prettierrc.json

@@ -0,0 +1,9 @@
+{
+    "semi": false,
+    "singleQuote": true,
+    "tabWidth": 4,
+    "useTabs": false,
+    "trailingComma": "es5",
+    "printWidth": 100,
+    "arrowParens": "avoid"
+}

EVENTBUS_EXAMPLE.md

@@ -1,120 +0,0 @@
-# EventBus Usage Examples
-
-## Type-Safe Event Bus
-
-The `EventBus` class provides fully type-safe event handling with TypeScript type inference.
-
-### Basic Usage
-
-```typescript
-import { EventBus } from '@xtr-dev/rondevu-client';
-
-// Define your event mapping
-interface AppEvents {
-  'user:connected': { userId: string; timestamp: number };
-  'user:disconnected': { userId: string };
-  'message:received': string;
-  'connection:error': Error;
-}
-
-// Create the event bus
-const events = new EventBus<AppEvents>();
-
-// Subscribe to events - TypeScript knows the exact data type!
-events.on('user:connected', (data) => {
-  // data is { userId: string; timestamp: number }
-  console.log(`User ${data.userId} connected at ${data.timestamp}`);
-});
-
-events.on('message:received', (data) => {
-  // data is string
-  console.log(data.toUpperCase());
-});
-
-// Emit events - TypeScript validates the data type
-events.emit('user:connected', {
-  userId: '123',
-  timestamp: Date.now()
-});
-
-events.emit('message:received', 'Hello World');
-
-// Type errors caught at compile time:
-// events.emit('user:connected', 'wrong type'); // ❌ Error!
-// events.emit('message:received', { wrong: 'type' }); // ❌ Error!
-```
-
-### One-Time Listeners
-
-```typescript
-// Subscribe once - handler auto-unsubscribes after first call
-events.once('connection:error', (error) => {
-  console.error('Connection failed:', error.message);
-});
-```
-
-### Unsubscribing
-
-```typescript
-const handler = (data: string) => {
-  console.log('Message:', data);
-};
-
-events.on('message:received', handler);
-
-// Later, unsubscribe
-events.off('message:received', handler);
-```
-
-### Utility Methods
-
-```typescript
-// Clear all handlers for a specific event
-events.clear('message:received');
-
-// Clear all handlers for all events
-events.clear();
-
-// Get listener count
-const count = events.listenerCount('user:connected');
-
-// Get all event names with handlers
-const eventNames = events.eventNames();
-```
-
-## Connection Events Example
-
-```typescript
-interface ConnectionEvents {
-  'connection:state': { state: 'connected' | 'disconnected' | 'connecting' };
-  'connection:message': { from: string; data: string | ArrayBuffer };
-  'connection:error': { code: string; message: string };
-}
-
-class ConnectionManager {
-  private events = new EventBus<ConnectionEvents>();
-
-  on<K extends keyof ConnectionEvents>(
-    event: K,
-    handler: (data: ConnectionEvents[K]) => void
-  ) {
-    this.events.on(event, handler);
-  }
-
-  private handleStateChange(state: 'connected' | 'disconnected' | 'connecting') {
-    this.events.emit('connection:state', { state });
-  }
-
-  private handleMessage(from: string, data: string | ArrayBuffer) {
-    this.events.emit('connection:message', { from, data });
-  }
-}
-```
-
-## Benefits
-
-- ✅ **Full type safety** - TypeScript validates event names and data types
-- ✅ **IntelliSense support** - Auto-completion for event names and data properties
-- ✅ **Compile-time errors** - Catch type mismatches before runtime
-- ✅ **Self-documenting** - Event interface serves as documentation
-- ✅ **Refactoring-friendly** - Rename events or change types with confidence

README.md

@@ -2,9 +2,9 @@
 
 [![npm version](https://img.shields.io/npm/v/@xtr-dev/rondevu-client)](https://www.npmjs.com/package/@xtr-dev/rondevu-client)
 
-🌐 **WebRTC with durable connections and automatic reconnection**
+🌐 **Simple, high-level WebRTC peer-to-peer connections**
 
-TypeScript/JavaScript client for Rondevu, providing durable WebRTC connections that survive network interruptions with automatic reconnection and message queuing.
+TypeScript/JavaScript client for Rondevu, providing easy-to-use WebRTC connections with automatic signaling, username-based discovery, and built-in reconnection support.
 
 **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))
@@ -15,14 +15,16 @@ TypeScript/JavaScript client for Rondevu, providing durable WebRTC connections t
 
 ## Features
 
-- **Durable Connections**: Automatic reconnection on network drops
+- **High-Level Wrappers**: ServiceHost and ServiceClient eliminate WebRTC boilerplate
-- **Message Queuing**: Messages sent during disconnections are queued and flushed on reconnect
+- **Username-Based Discovery**: Connect to peers by username, not complex offer/answer exchange
-- **Durable Channels**: RTCDataChannel wrappers that survive connection drops
+- **Semver-Compatible Matching**: Requesting chat@1.0.0 matches any compatible 1.x.x version
-- **TTL Auto-Refresh**: Services automatically republish before expiration
+- **Privacy-First Design**: Services are hidden by default - no enumeration possible
-- **Username Claiming**: Cryptographic ownership with Ed25519 signatures
+- **Automatic Reconnection**: Built-in retry logic with exponential backoff
-- **Service Publishing**: Package-style naming (com.example.chat@1.0.0)
+- **Message Queuing**: Messages sent while disconnected are queued and flushed on reconnect
+- **Cryptographic Username Claiming**: Secure ownership with Ed25519 signatures
+- **Service Publishing**: Package-style naming (chat.app@1.0.0) with multiple simultaneous offers
 - **TypeScript**: Full type safety and autocomplete
-- **Configurable**: All timeouts, retry limits, and queue sizes are configurable
+- **Configurable Polling**: Exponential backoff with jitter to reduce server load
 
 ## Install
 
@@ -32,588 +34,400 @@ npm install @xtr-dev/rondevu-client
 
 ## Quick Start
 
-### Publishing a Service (Alice)
+### Hosting a Service (Alice)
 
 ```typescript
-import { Rondevu } from '@xtr-dev/rondevu-client';
+import { RondevuService, ServiceHost } from '@xtr-dev/rondevu-client'
 
-// Initialize client and register
+// Step 1: Create and initialize service
-const client = new Rondevu({ baseUrl: 'https://api.ronde.vu' });
+const service = new RondevuService({
-await client.register();
+    apiUrl: 'https://api.ronde.vu',
+    username: 'alice'
+})
 
-// Step 1: Claim username (one-time)
+await service.initialize()  // Generates keypair
-const claim = await client.usernames.claimUsername('alice');
+await service.claimUsername()  // Claims username with signature
-client.usernames.saveKeypairToStorage('alice', claim.publicKey, claim.privateKey);
 
-// Step 2: Expose service with handler
+// Step 2: Create ServiceHost
-const keypair = client.usernames.loadKeypairFromStorage('alice');
+const host = new ServiceHost({
+    service: 'chat.app@1.0.0',
+    rondevuService: service,
+    maxPeers: 5,  // Accept up to 5 connections
+    ttl: 300000   // 5 minutes
+})
 
-const service = await client.exposeService({
+// Step 3: Listen for incoming connections
-  username: 'alice',
+host.events.on('connection', (connection) => {
-  privateKey: keypair.privateKey,
+    console.log('✅ New connection!')
-  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) => {
+    connection.events.on('message', (msg) => {
-      console.log('📥 Received:', data);
+        console.log('📨 Received:', msg)
-      channel.send(`Echo: ${data}`);
+        connection.sendMessage('Hello from Alice!')
-    });
+    })
 
-    channel.on('close', () => {
+    connection.events.on('state-change', (state) => {
-      console.log(`👋 Connection ${connectionId} closed`);
+        console.log('Connection state:', state)
-    });
+    })
-  }
+})
-});
 
-// Start the service
+host.events.on('error', (error) => {
-const info = await service.start();
+    console.error('Host error:', error)
-console.log(`Service published with UUID: ${info.uuid}`);
+})
-console.log('Waiting for connections...');
 
-// Later: stop the service
+// Step 4: Start hosting
-await service.stop();
+await host.start()
+console.log('Service is now live! Others can connect to @alice')
+
+// Later: stop hosting
+host.dispose()
 ```
 
 ### Connecting to a Service (Bob)
 
 ```typescript
-import { Rondevu } from '@xtr-dev/rondevu-client';
+import { RondevuService, ServiceClient } from '@xtr-dev/rondevu-client'
 
-// Initialize client and register
+// Step 1: Create and initialize service
-const client = new Rondevu({ baseUrl: 'https://api.ronde.vu' });
+const service = new RondevuService({
-await client.register();
+    apiUrl: 'https://api.ronde.vu',
+    username: 'bob'
+})
 
-// Connect to Alice's service
+await service.initialize()
-const connection = await client.connect('alice', 'chat@1.0.0', {
+await service.claimUsername()
+
+// Step 2: Create ServiceClient
+const client = new ServiceClient({
+    username: 'alice',  // Connect to Alice
+    serviceFqn: 'chat.app@1.0.0',
+    rondevuService: service,
+    autoReconnect: true,
     maxReconnectAttempts: 5
-});
+})
 
-// Create a durable channel
+// Step 3: Listen for connection events
-const channel = connection.createChannel('main');
+client.events.on('connected', (connection) => {
+    console.log('✅ Connected to Alice!')
 
-channel.on('message', (data) => {
+    connection.events.on('message', (msg) => {
-  console.log('📥 Received:', data);
+        console.log('📨 Received:', msg)
-});
+    })
 
-channel.on('open', () => {
+    // Send a message
-  console.log('✅ Channel open');
+    connection.sendMessage('Hello from Bob!')
-  channel.send('Hello Alice!');
+})
-});
 
-// Listen for connection events
+client.events.on('disconnected', () => {
-connection.on('connected', () => {
+    console.log('🔌 Disconnected')
-  console.log('🎉 Connected to Alice');
+})
-});
 
-connection.on('reconnecting', (attempt, max, delay) => {
+client.events.on('reconnecting', ({ attempt, maxAttempts }) => {
-  console.log(`🔄 Reconnecting... (${attempt}/${max}, retry in ${delay}ms)`);
+    console.log(`🔄 Reconnecting (${attempt}/${maxAttempts})...`)
-});
+})
 
-connection.on('disconnected', () => {
+client.events.on('error', (error) => {
-  console.log('🔌 Disconnected');
+    console.error('❌ Error:', error)
-});
+})
 
-connection.on('failed', (error) => {
+// Step 4: Connect
-  console.error('❌ Connection failed permanently:', error);
+await client.connect()
-});
 
-// Establish the connection
+// Later: disconnect
-await connection.connect();
+client.dispose()
-
-// 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
+### RondevuService
 
-Manages WebRTC peer lifecycle with automatic reconnection:
+Handles authentication and username management:
-- Automatically reconnects when connection drops
+- Generates Ed25519 keypair for signing
-- Exponential backoff with jitter (1s → 2s → 4s → 8s → ... max 30s)
+- Claims usernames with cryptographic proof
-- Configurable max retry attempts (default: 10)
+- Provides API client for signaling server
-- Manages multiple DurableChannel instances
 
-### DurableChannel
+### ServiceHost
 
-Wraps RTCDataChannel with message queuing:
+High-level wrapper for hosting a WebRTC service:
-- Queues messages during disconnection
+- Automatically creates and publishes offers
-- Flushes queue on reconnection
+- Handles incoming connections
-- Configurable queue size and message age limits
+- Manages ICE candidate exchange
-- RTCDataChannel-compatible API with event emitters
+- Supports multiple simultaneous peers
 
-### DurableService
+### ServiceClient
 
-Server-side service with TTL auto-refresh:
+High-level wrapper for connecting to services:
-- Automatically republishes service before TTL expires
+- Discovers services by username
-- Creates DurableConnection for each incoming peer
+- Handles offer/answer exchange automatically
-- Manages connection pool for multiple simultaneous connections
+- Built-in auto-reconnection with exponential backoff
+- Event-driven API
+
+### RTCDurableConnection
+
+Low-level connection wrapper (used internally):
+- Manages WebRTC PeerConnection lifecycle
+- Handles ICE candidate polling
+- Provides message queue for reliability
+- State management and events
 
 ## API Reference
 
-### Main Client
+### RondevuService
 
 ```typescript
-const client = new Rondevu({
+const service = new RondevuService({
-  baseUrl: 'https://api.ronde.vu',  // optional, default shown
+    apiUrl: string,           // Signaling server URL
-  credentials?: { peerId, secret },  // optional, skip registration
+    username: string,         // Your username
-  fetch?: customFetch,               // optional, for Node.js < 18
+    keypair?: Keypair         // Optional: reuse existing keypair
-  RTCPeerConnection?: RTCPeerConnection,  // optional, for Node.js
+})
-  RTCSessionDescription?: RTCSessionDescription,
-  RTCIceCandidate?: RTCIceCandidate
-});
 
-// Register and get credentials
+// Initialize service (generates keypair if not provided)
-const creds = await client.register();
+await service.initialize(): Promise<void>
-// { peerId: '...', secret: '...' }
 
-// Check if authenticated
+// Claim username with cryptographic signature
-client.isAuthenticated(); // boolean
+await service.claimUsername(): Promise<void>
 
-// Get current credentials
+// Check if username is claimed
-client.getCredentials(); // { peerId, secret } | undefined
+service.isUsernameClaimed(): boolean
+
+// Get current username
+service.getUsername(): string
+
+// Get keypair
+service.getKeypair(): Keypair
+
+// Get API client
+service.getAPI(): RondevuAPI
 ```
 
-### Username API
+### ServiceHost
 
 ```typescript
-// Check username availability
+const host = new ServiceHost({
-const check = await client.usernames.checkUsername('alice');
+    service: string,              // Service FQN (e.g., 'chat.app@1.0.0')
-// { available: true } or { available: false, expiresAt: number, publicKey: string }
+    rondevuService: RondevuService,
+    maxPeers?: number,            // Default: 5
+    ttl?: number,                 // Default: 300000 (5 minutes)
+    isPublic?: boolean,           // Default: true
+    rtcConfiguration?: RTCConfiguration
+})
 
-// Claim username with new keypair
+// Start hosting
-const claim = await client.usernames.claimUsername('alice');
+await host.start(): Promise<void>
-// { username, publicKey, privateKey, claimedAt, expiresAt }
 
-// Save keypair to localStorage
+// Stop hosting and cleanup
-client.usernames.saveKeypairToStorage('alice', claim.publicKey, claim.privateKey);
+host.dispose(): void
 
-// Load keypair from localStorage
+// Get all active connections
-const keypair = client.usernames.loadKeypairFromStorage('alice');
+host.getConnections(): RTCDurableConnection[]
-// { publicKey, privateKey } | null
+
+// Events
+host.events.on('connection', (conn: RTCDurableConnection) => {})
+host.events.on('error', (error: Error) => {})
 ```
 
-**Username Rules:**
+### ServiceClient
-- 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 client = new ServiceClient({
-const service = await client.exposeService({
+    username: string,             // Host username to connect to
-  username: 'alice',
+    serviceFqn: string,          // Service FQN (e.g., 'chat.app@1.0.0')
-  privateKey: keypair.privateKey,
+    rondevuService: RondevuService,
-  serviceFqn: 'chat@1.0.0',
+    autoReconnect?: boolean,     // Default: true
+    maxReconnectAttempts?: number, // Default: 5
+    rtcConfiguration?: RTCConfiguration
+})
 
-  // Service options
+// Connect to service
-  isPublic: true,               // optional, default: false
+await client.connect(): Promise<RTCDurableConnection>
-  metadata: { version: '1.0' }, // optional
-  ttl: 300000,                  // optional, default: 5 minutes
-  ttlRefreshMargin: 0.2,        // optional, refresh at 80% of TTL
 
-  // Connection pooling
+// Disconnect and cleanup
-  poolSize: 10,                 // optional, default: 1
+client.dispose(): void
-  pollingInterval: 2000,        // optional, default: 2000ms
 
-  // Connection options (applied to incoming connections)
+// Get current connection
-  maxReconnectAttempts: 10,     // optional, default: 10
+client.getConnection(): RTCDurableConnection | null
-  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
+// Events
-  maxQueueSize: 1000,           // optional, default: 1000
+client.events.on('connected', (conn: RTCDurableConnection) => {})
-  maxMessageAge: 60000,         // optional, default: 60000ms (1 minute)
+client.events.on('disconnected', () => {})
+client.events.on('reconnecting', (info: { attempt: number, maxAttempts: number }) => {})
+client.events.on('error', (error: Error) => {})
+```
 
-  // WebRTC configuration
+### RTCDurableConnection
-  rtcConfig: {
-    iceServers: [
-      { urls: 'stun:stun.l.google.com:19302' }
-    ]
-  },
 
-  // Connection handler
+```typescript
-  handler: (channel, connectionId) => {
+// Connection state
-    // Handle incoming connection
+connection.state: 'connected' | 'connecting' | 'disconnected'
-    channel.on('message', (data) => {
+
-      console.log('Received:', data);
+// Send message (returns true if sent, false if queued)
-      channel.send(`Echo: ${data}`);
+await connection.sendMessage(message: string): Promise<boolean>
-    });
+
+// Queue message for sending when connected
+await connection.queueMessage(message: string, options?: QueueMessageOptions): Promise<void>
+
+// Disconnect
+connection.disconnect(): void
+
+// Events
+connection.events.on('message', (msg: string) => {})
+connection.events.on('state-change', (state: ConnectionStates) => {})
+```
+
+## Configuration
+
+### Polling Configuration
+
+The signaling uses configurable polling with exponential backoff:
+
+```typescript
+// Default polling config
+{
+    initialInterval: 500,      // Start at 500ms
+    maxInterval: 5000,         // Max 5 seconds
+    backoffMultiplier: 1.5,    // Increase by 1.5x each time
+    maxRetries: 50,            // Max 50 attempts
+    jitter: true               // Add random 0-100ms to prevent thundering herd
 }
-});
-
-// 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:**
+This is handled automatically - no configuration needed.
-```typescript
-service.on('published', (serviceId, uuid) => {
-  console.log(`Service published: ${uuid}`);
-});
 
-service.on('connection', (connectionId) => {
+### WebRTC Configuration
-  console.log(`New connection: ${connectionId}`);
-});
 
-service.on('disconnection', (connectionId) => {
+Provide custom STUN/TURN servers:
-  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 host = new ServiceHost({
-const connection = await client.connect('alice', 'chat@1.0.0', {
+    service: 'chat.app@1.0.0',
-  // Connection options
+    rondevuService: service,
-  maxReconnectAttempts: 10,     // optional, default: 10
+    rtcConfiguration: {
-  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' }
+            { urls: 'stun:stun.l.google.com:19302' },
+            {
+                urls: 'turn:turn.example.com:3478',
+                username: 'user',
+                credential: 'pass'
+            }
         ]
     }
-});
+})
-
-// Connect by UUID
-const connection2 = await client.connectByUuid('service-uuid-here', {
-  maxReconnectAttempts: 5
-});
-
-// Create channels before connecting
-const channel = connection.createChannel('main');
-const fileChannel = connection.createChannel('files', {
-  ordered: false,
-  maxRetransmits: 3
-});
-
-// 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:**
+## Username Rules
-```typescript
-connection.on('state', (newState, previousState) => {
-  console.log(`State: ${previousState} → ${newState}`);
-});
 
-connection.on('connected', () => {
+- **Format**: Lowercase alphanumeric + dash (`a-z`, `0-9`, `-`)
-  console.log('Connected');
+- **Length**: 3-32 characters
-});
+- **Pattern**: `^[a-z0-9][a-z0-9-]*[a-z0-9]$`
-
+- **Validity**: 365 days from claim/last use
-connection.on('reconnecting', (attempt, maxAttempts, delay) => {
+- **Ownership**: Secured by Ed25519 public key signature
-  console.log(`Reconnecting (${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');
-});
-```
-
-### Durable Channel API
-
-```typescript
-const channel = connection.createChannel('chat', {
-  ordered: true,          // optional, default: true
-  maxRetransmits: undefined  // optional, for unordered channels
-});
-
-// Send data (queued if disconnected)
-channel.send('Hello!');
-channel.send(new ArrayBuffer(1024));
-channel.send(new Blob(['data']));
-
-// Check state
-const state = channel.readyState;
-// 'connecting' | 'open' | 'closing' | 'closed'
-
-// 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
+See [demo/demo.js](./demo/demo.js) for a complete working example.
-// Server
-const client = new Rondevu();
-await client.register();
 
-const claim = await client.usernames.claimUsername('alice');
+### Persistent Keypair
-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
+// Save keypair to localStorage
-const service = await client.exposeService({
+const service = new RondevuService({
-  username: 'alice',
+    apiUrl: 'https://api.ronde.vu',
-  privateKey: keypair.privateKey,
+    username: 'alice'
-  serviceFqn: 'files@1.0.0',
+})
-  handler: (channel, connectionId) => {
-    channel.on('message', async (data) => {
-      const request = JSON.parse(data);
 
-      if (request.action === 'download') {
+await service.initialize()
-        const file = await fs.readFile(request.path);
+await service.claimUsername()
-        const chunkSize = 16 * 1024; // 16KB chunks
 
-        for (let i = 0; i < file.byteLength; i += chunkSize) {
+// Save for later
-          const chunk = file.slice(i, i + chunkSize);
+localStorage.setItem('rondevu-keypair', JSON.stringify(service.getKeypair()))
-          channel.send(chunk);
+localStorage.setItem('rondevu-username', service.getUsername())
 
-          // Wait for buffer to drain if needed
+// Load on next session
-          while (channel.bufferedAmount > 16 * 1024 * 1024) { // 16MB
+const savedKeypair = JSON.parse(localStorage.getItem('rondevu-keypair'))
-            await new Promise(resolve => setTimeout(resolve, 100));
+const savedUsername = localStorage.getItem('rondevu-username')
-          }
-        }
 
-        channel.send(JSON.stringify({ done: true }));
+const service2 = new RondevuService({
-      }
+    apiUrl: 'https://api.ronde.vu',
-    });
+    username: savedUsername,
-  }
+    keypair: savedKeypair
-});
+})
 
-await service.start();
+await service2.initialize()  // Reuses keypair
-
-// 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
+### Message Queue Example
+
+```typescript
+// Messages are automatically queued if not connected yet
+client.events.on('connected', (connection) => {
+    // Send immediately
+    connection.sendMessage('Hello!')
+})
+
+// Or queue for later
+await client.connect()
+const conn = client.getConnection()
+await conn.queueMessage('This will be sent when connected', {
+    expiresAt: Date.now() + 60000  // Expire after 1 minute
+})
+```
+
+## Migration from v0.9.x
+
+v0.11.0+ introduces high-level wrappers, RESTful API changes, and semver-compatible discovery:
+
+**API Changes:**
+- Server endpoints restructured (`/usernames/*` → `/users/*`)
+- Added `ServiceHost` and `ServiceClient` wrappers
+- Message queue fully implemented
+- Configurable polling with exponential backoff
+- Removed deprecated `cleanup()` methods (use `dispose()`)
+- **v0.11.0+**: Services use `offers` array instead of single `sdp`
+- **v0.11.0+**: Semver-compatible service discovery (chat@1.0.0 matches 1.x.x)
+- **v0.11.0+**: All services are hidden - no listing endpoint
+- **v0.11.0+**: Services support multiple simultaneous offers for connection pooling
+
+**Migration Guide:**
+
+```typescript
+// Before (v0.9.x) - Manual WebRTC setup
+const signaler = new RondevuSignaler(service, 'chat@1.0.0')
+const context = new WebRTCContext()
+const pc = context.createPeerConnection()
+// ... 50+ lines of boilerplate
+
+// After (v0.11.0) - ServiceHost wrapper
+const host = new ServiceHost({
+    service: 'chat@1.0.0',
+    rondevuService: service
+})
+await host.start()
+// Done!
+```
+
+## Platform Support
 
 ### Modern Browsers
 Works out of the box - no additional setup needed.
 
 ### Node.js 18+
-Native fetch is available, but you need WebRTC polyfills:
+Native fetch is available, but WebRTC requires polyfills:
 
 ```bash
 npm install wrtc
 ```
 
 ```typescript
-import { Rondevu } from '@xtr-dev/rondevu-client';
+import { WebRTCContext } from '@xtr-dev/rondevu-client'
-import { RTCPeerConnection, RTCSessionDescription, RTCIceCandidate } from 'wrtc';
+import { RTCPeerConnection, RTCSessionDescription, RTCIceCandidate } from 'wrtc'
 
-const client = new Rondevu({
+// Configure WebRTC context
-  baseUrl: 'https://api.ronde.vu',
+const context = new WebRTCContext({
     RTCPeerConnection,
     RTCSessionDescription,
     RTCIceCandidate
-});
+} as any)
-```
-
-### 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
@@ -622,38 +436,23 @@ All types are exported:
 
 ```typescript
 import type {
-  // Client types
+    RondevuServiceOptions,
+    ServiceHostOptions,
+    ServiceHostEvents,
+    ServiceClientOptions,
+    ServiceClientEvents,
+    ConnectionInterface,
+    ConnectionEvents,
+    ConnectionStates,
+    Message,
+    QueueMessageOptions,
+    Signaler,
+    PollingConfig,
     Credentials,
-  RondevuOptions,
+    Keypair
-
+} from '@xtr-dev/rondevu-client'
-  // 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

USAGE.md

@@ -0,0 +1,281 @@
+# Rondevu Client Usage Guide
+
+## Installation
+
+```bash
+npm install @xtr-dev/rondevu-client
+```
+
+## Quick Start
+
+### 1. Register and Create Connection
+
+```typescript
+import { RondevuAPI, RondevuSignaler, WebRTCRondevuConnection } from '@xtr-dev/rondevu-client';
+
+const API_URL = 'https://api.ronde.vu';
+
+// Register to get credentials
+const api = new RondevuAPI(API_URL);
+const credentials = await api.register();
+
+// Create authenticated API client
+const authenticatedApi = new RondevuAPI(API_URL, credentials);
+```
+
+### 2. Create an Offer (Offerer Side)
+
+```typescript
+// Create a connection
+const connection = new WebRTCRondevuConnection(
+  'connection-id',
+  'host-username',
+  'service-name'
+);
+
+// Wait for local description
+await connection.ready;
+
+// Create offer on server
+const offers = await authenticatedApi.createOffers([{
+  sdp: connection.connection.localDescription!.sdp!,
+  ttl: 300000 // 5 minutes
+}]);
+
+const offerId = offers[0].id;
+
+// Set up signaler for ICE candidate exchange
+const signaler = new RondevuSignaler(authenticatedApi, offerId);
+connection.setSignaler(signaler);
+
+// Poll for answer
+const checkAnswer = setInterval(async () => {
+  const answer = await authenticatedApi.getAnswer(offerId);
+  if (answer) {
+    clearInterval(checkAnswer);
+    await connection.connection.setRemoteDescription({
+      type: 'answer',
+      sdp: answer.sdp
+    });
+    console.log('Connection established!');
+  }
+}, 1000);
+```
+
+### 3. Answer an Offer (Answerer Side)
+
+```typescript
+// Get the offer
+const offer = await authenticatedApi.getOffer(offerId);
+
+// Create connection with remote offer
+const connection = new WebRTCRondevuConnection(
+  'connection-id',
+  'peer-username',
+  'service-name',
+  {
+    type: 'offer',
+    sdp: offer.sdp
+  }
+);
+
+// Wait for local description (answer)
+await connection.ready;
+
+// Send answer to server
+await authenticatedApi.answerOffer(
+  offerId,
+  connection.connection.localDescription!.sdp!
+);
+
+// Set up signaler for ICE candidate exchange
+const signaler = new RondevuSignaler(authenticatedApi, offerId);
+connection.setSignaler(signaler);
+
+console.log('Connection established!');
+```
+
+## Using Services
+
+### Publish a Service
+
+```typescript
+import { RondevuAPI } from '@xtr-dev/rondevu-client';
+
+const api = new RondevuAPI(API_URL, credentials);
+
+const service = await api.publishService({
+  username: 'my-username',
+  serviceFqn: 'chat.app@1.0.0',
+  sdp: localDescription.sdp,
+  ttl: 300000,
+  isPublic: true,
+  metadata: { description: 'My chat service' },
+  signature: '...', // Ed25519 signature
+  message: '...'    // Signed message
+});
+
+console.log('Service UUID:', service.uuid);
+```
+
+### Connect to a Service
+
+```typescript
+// Search for services
+const services = await api.searchServices('username', 'chat.app@1.0.0');
+
+if (services.length > 0) {
+  // Get service details with offer
+  const service = await api.getService(services[0].uuid);
+
+  // Create connection with service offer
+  const connection = new WebRTCRondevuConnection(
+    service.serviceId,
+    service.username,
+    service.serviceFqn,
+    {
+      type: 'offer',
+      sdp: service.sdp
+    }
+  );
+
+  await connection.ready;
+
+  // Answer the service offer
+  await api.answerOffer(
+    service.offerId,
+    connection.connection.localDescription!.sdp!
+  );
+
+  // Set up signaler
+  const signaler = new RondevuSignaler(api, service.offerId);
+  connection.setSignaler(signaler);
+}
+```
+
+## Event Handling
+
+```typescript
+import { EventBus } from '@xtr-dev/rondevu-client';
+
+// Connection events
+connection.events.on('state-change', (state) => {
+  console.log('Connection state:', state);
+});
+
+connection.events.on('message', (message) => {
+  console.log('Received message:', message);
+});
+
+// Custom events with EventBus
+interface MyEvents {
+  'user:connected': { userId: string; timestamp: number };
+  'message:sent': string;
+}
+
+const events = new EventBus<MyEvents>();
+
+events.on('user:connected', (data) => {
+  console.log(`User ${data.userId} connected at ${data.timestamp}`);
+});
+
+events.emit('user:connected', {
+  userId: '123',
+  timestamp: Date.now()
+});
+```
+
+## Cleanup
+
+```typescript
+import { createBin } from '@xtr-dev/rondevu-client';
+
+const bin = createBin();
+
+// Add cleanup functions
+bin(
+  () => console.log('Cleanup 1'),
+  () => console.log('Cleanup 2')
+);
+
+// Clean all
+bin.clean();
+```
+
+## API Reference
+
+### RondevuAPI
+
+Complete API client for Rondevu signaling server.
+
+**Methods:**
+- `register()` - Register new peer
+- `createOffers(offers)` - Create offers
+- `getOffer(offerId)` - Get offer by ID
+- `answerOffer(offerId, sdp)` - Answer an offer
+- `getAnswer(offerId)` - Poll for answer
+- `searchOffers(topic)` - Search by topic
+- `addIceCandidates(offerId, candidates)` - Add ICE candidates
+- `getIceCandidates(offerId, since)` - Get ICE candidates (polling)
+- `publishService(service)` - Publish service
+- `getService(uuid)` - Get service by UUID
+- `searchServices(username, serviceFqn)` - Search services
+- `checkUsername(username)` - Check availability
+- `claimUsername(username, publicKey, signature, message)` - Claim username
+
+### RondevuSignaler
+
+Handles ICE candidate exchange via polling.
+
+**Constructor:**
+```typescript
+new RondevuSignaler(api: RondevuAPI, offerId: string)
+```
+
+**Methods:**
+- `addIceCandidate(candidate)` - Send local candidate
+- `addListener(callback)` - Poll for remote candidates (returns cleanup function)
+
+### WebRTCRondevuConnection
+
+WebRTC connection wrapper with type-safe events.
+
+**Constructor:**
+```typescript
+new WebRTCRondevuConnection(
+  id: string,
+  host: string,
+  service: string,
+  offer?: RTCSessionDescriptionInit
+)
+```
+
+**Properties:**
+- `id` - Connection ID
+- `host` - Host username
+- `service` - Service FQN
+- `state` - Connection state
+- `events` - EventBus for state changes and messages
+- `ready` - Promise that resolves when local description is set
+
+**Methods:**
+- `setSignaler(signaler)` - Set signaler for ICE exchange
+- `queueMessage(message, options)` - Queue message for sending
+- `sendMessage(message)` - Send message immediately
+
+### EventBus<TEvents>
+
+Type-safe event emitter with inferred types.
+
+**Methods:**
+- `on(event, handler)` - Subscribe
+- `once(event, handler)` - Subscribe once
+- `off(event, handler)` - Unsubscribe
+- `emit(event, data)` - Emit event
+- `clear(event?)` - Clear handlers
+- `listenerCount(event)` - Get listener count
+- `eventNames()` - Get event names
+
+## Examples
+
+See the demo application at https://github.com/xtr-dev/rondevu-demo for a complete working example.

eslint.config.js

@@ -0,0 +1,52 @@
+import js from '@eslint/js'
+import tsPlugin from '@typescript-eslint/eslint-plugin'
+import tsParser from '@typescript-eslint/parser'
+import prettierConfig from 'eslint-config-prettier'
+import prettierPlugin from 'eslint-plugin-prettier'
+import unicorn from 'eslint-plugin-unicorn'
+import globals from 'globals'
+
+export default [
+    js.configs.recommended,
+    {
+        files: ['**/*.ts', '**/*.tsx', '**/*.js'],
+        languageOptions: {
+            parser: tsParser,
+            parserOptions: {
+                ecmaVersion: 'latest',
+                sourceType: 'module',
+            },
+            globals: {
+                ...globals.browser,
+                ...globals.node,
+                RTCPeerConnection: 'readonly',
+                RTCIceCandidate: 'readonly',
+                RTCSessionDescriptionInit: 'readonly',
+                RTCIceCandidateInit: 'readonly',
+                BufferSource: 'readonly',
+            },
+        },
+        plugins: {
+            '@typescript-eslint': tsPlugin,
+            prettier: prettierPlugin,
+            unicorn: unicorn,
+        },
+        rules: {
+            ...tsPlugin.configs.recommended.rules,
+            ...prettierConfig.rules,
+            'prettier/prettier': 'error',
+            '@typescript-eslint/no-explicit-any': 'off',
+            '@typescript-eslint/no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
+            'unicorn/filename-case': [
+                'error',
+                {
+                    case: 'kebabCase',
+                    ignore: ['^README\\.md$'],
+                },
+            ],
+        },
+    },
+    {
+        ignores: ['dist/**', 'node_modules/**', '*.config.js'],
+    },
+]

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xtr-dev/rondevu-client",
-  "version": "0.9.2",
+  "version": "0.12.0",
   "description": "TypeScript client for Rondevu with durable WebRTC connections, automatic reconnection, and message queuing",
   "type": "module",
   "main": "dist/index.js",
@@ -8,6 +8,10 @@
   "scripts": {
     "build": "tsc",
     "typecheck": "tsc --noEmit",
+    "dev": "vite",
+    "lint": "eslint src demo --ext .ts,.tsx,.js",
+    "lint:fix": "eslint src demo --ext .ts,.tsx,.js --fix",
+    "format": "prettier --write \"src/**/*.{ts,tsx,js}\" \"demo/**/*.{ts,tsx,js,html}\"",
     "prepublishOnly": "npm run build"
   },
   "keywords": [
@@ -20,14 +24,23 @@
   "author": "",
   "license": "MIT",
   "devDependencies": {
-    "typescript": "^5.9.3"
+    "@eslint/js": "^9.39.1",
+    "@typescript-eslint/eslint-plugin": "^8.48.1",
+    "@typescript-eslint/parser": "^8.48.1",
+    "eslint": "^9.39.1",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-prettier": "^5.5.4",
+    "eslint-plugin-unicorn": "^62.0.0",
+    "globals": "^16.5.0",
+    "prettier": "^3.7.4",
+    "typescript": "^5.9.3",
+    "vite": "^7.2.6"
   },
   "files": [
     "dist",
     "README.md"
   ],
   "dependencies": {
-    "@noble/ed25519": "^3.0.0",
+    "@noble/ed25519": "^3.0.0"
-    "@xtr-dev/rondevu-client": "^0.9.2"
   }
 }

src/api.ts

@@ -0,0 +1,466 @@
+/**
+ * Rondevu API Client - Single class for all API endpoints
+ */
+
+import * as ed25519 from '@noble/ed25519'
+
+// Set SHA-512 hash function for ed25519 (required in @noble/ed25519 v3+)
+ed25519.hashes.sha512Async = async (message: Uint8Array) => {
+    return new Uint8Array(await crypto.subtle.digest('SHA-512', message as BufferSource))
+}
+
+export interface Credentials {
+    peerId: string
+    secret: string
+}
+
+export interface Keypair {
+    publicKey: string
+    privateKey: string
+}
+
+export interface OfferRequest {
+    sdp: string
+    topics?: string[]
+    ttl?: number
+    secret?: string
+}
+
+export interface Offer {
+    id: string
+    peerId: string
+    sdp: string
+    topics: string[]
+    ttl: number
+    createdAt: number
+    expiresAt: number
+    answererPeerId?: string
+}
+
+export interface OfferRequest {
+    sdp: string
+}
+
+export interface ServiceRequest {
+    username: string
+    serviceFqn: string
+    offers: OfferRequest[]
+    ttl?: number
+    isPublic?: boolean
+    metadata?: Record<string, any>
+    signature: string
+    message: string
+}
+
+export interface ServiceOffer {
+    offerId: string
+    sdp: string
+    createdAt: number
+    expiresAt: number
+}
+
+export interface Service {
+    serviceId: string
+    uuid: string
+    offers: ServiceOffer[]
+    username: string
+    serviceFqn: string
+    isPublic: boolean
+    metadata?: Record<string, any>
+    createdAt: number
+    expiresAt: number
+}
+
+export interface IceCandidate {
+    candidate: RTCIceCandidateInit
+    createdAt: number
+}
+
+/**
+ * Helper: Convert Uint8Array to base64 string
+ */
+function bytesToBase64(bytes: Uint8Array): string {
+    const binString = Array.from(bytes, byte => String.fromCodePoint(byte)).join('')
+    return btoa(binString)
+}
+
+/**
+ * Helper: Convert base64 string to Uint8Array
+ */
+function base64ToBytes(base64: string): Uint8Array {
+    const binString = atob(base64)
+    return Uint8Array.from(binString, char => char.codePointAt(0)!)
+}
+
+/**
+ * RondevuAPI - Complete API client for Rondevu signaling server
+ */
+export class RondevuAPI {
+    constructor(
+        private baseUrl: string,
+        private credentials?: Credentials
+    ) {}
+
+    /**
+     * Set credentials for authentication
+     */
+    setCredentials(credentials: Credentials): void {
+        this.credentials = credentials
+    }
+
+    /**
+     * Authentication header
+     */
+    private getAuthHeader(): Record<string, string> {
+        if (!this.credentials) {
+            return {}
+        }
+        return {
+            Authorization: `Bearer ${this.credentials.peerId}:${this.credentials.secret}`,
+        }
+    }
+
+    // ============================================
+    // Ed25519 Cryptography Helpers
+    // ============================================
+
+    /**
+     * Generate an Ed25519 keypair for username claiming and service publishing
+     */
+    static async generateKeypair(): Promise<Keypair> {
+        const privateKey = ed25519.utils.randomSecretKey()
+        const publicKey = await ed25519.getPublicKeyAsync(privateKey)
+
+        return {
+            publicKey: bytesToBase64(publicKey),
+            privateKey: bytesToBase64(privateKey),
+        }
+    }
+
+    /**
+     * Sign a message with an Ed25519 private key
+     */
+    static 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)
+    }
+
+    /**
+     * Verify a signature
+     */
+    static async verifySignature(
+        message: string,
+        signatureBase64: string,
+        publicKeyBase64: string
+    ): Promise<boolean> {
+        const publicKey = base64ToBytes(publicKeyBase64)
+        const signature = base64ToBytes(signatureBase64)
+        const encoder = new TextEncoder()
+        const messageBytes = encoder.encode(message)
+
+        return await ed25519.verifyAsync(signature, messageBytes, publicKey)
+    }
+
+    // ============================================
+    // Authentication
+    // ============================================
+
+    /**
+     * Register a new peer and get credentials
+     */
+    async register(): Promise<Credentials> {
+        const response = await fetch(`${this.baseUrl}/register`, {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+        })
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Registration failed: ${error.error || response.statusText}`)
+        }
+
+        return await response.json()
+    }
+
+    // ============================================
+    // Offers
+    // ============================================
+
+    /**
+     * Create one or more offers
+     */
+    async createOffers(offers: OfferRequest[]): Promise<Offer[]> {
+        const response = await fetch(`${this.baseUrl}/offers`, {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json',
+                ...this.getAuthHeader(),
+            },
+            body: JSON.stringify({ offers }),
+        })
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to create offers: ${error.error || response.statusText}`)
+        }
+
+        return await response.json()
+    }
+
+    /**
+     * Get offer by ID
+     */
+    async getOffer(offerId: string): Promise<Offer> {
+        const response = await fetch(`${this.baseUrl}/offers/${offerId}`, {
+            headers: this.getAuthHeader(),
+        })
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to get offer: ${error.error || response.statusText}`)
+        }
+
+        return await response.json()
+    }
+
+    /**
+     * Answer a service
+     */
+    async answerService(serviceUuid: string, sdp: string): Promise<{ offerId: string }> {
+        const response = await fetch(`${this.baseUrl}/services/${serviceUuid}/answer`, {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json',
+                ...this.getAuthHeader(),
+            },
+            body: JSON.stringify({ sdp }),
+        })
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to answer service: ${error.error || response.statusText}`)
+        }
+
+        return await response.json()
+    }
+
+    /**
+     * Get answer for a service (offerer polls this)
+     */
+    async getServiceAnswer(serviceUuid: string): Promise<{ sdp: string; offerId: string } | null> {
+        const response = await fetch(`${this.baseUrl}/services/${serviceUuid}/answer`, {
+            headers: this.getAuthHeader(),
+        })
+
+        if (!response.ok) {
+            // 404 means not yet answered
+            if (response.status === 404) {
+                return null
+            }
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to get answer: ${error.error || response.statusText}`)
+        }
+
+        const data = await response.json()
+        return { sdp: data.sdp, offerId: data.offerId }
+    }
+
+    /**
+     * Search offers by topic
+     */
+    async searchOffers(topic: string): Promise<Offer[]> {
+        const response = await fetch(`${this.baseUrl}/offers?topic=${encodeURIComponent(topic)}`, {
+            headers: this.getAuthHeader(),
+        })
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to search offers: ${error.error || response.statusText}`)
+        }
+
+        return await response.json()
+    }
+
+    // ============================================
+    // ICE Candidates
+    // ============================================
+
+    /**
+     * Add ICE candidates to a service
+     */
+    async addServiceIceCandidates(serviceUuid: string, candidates: RTCIceCandidateInit[], offerId?: string): Promise<{ offerId: string }> {
+        const response = await fetch(`${this.baseUrl}/services/${serviceUuid}/ice-candidates`, {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json',
+                ...this.getAuthHeader(),
+            },
+            body: JSON.stringify({ candidates, offerId }),
+        })
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to add ICE candidates: ${error.error || response.statusText}`)
+        }
+
+        return await response.json()
+    }
+
+    /**
+     * Get ICE candidates for a service (with polling support)
+     */
+    async getServiceIceCandidates(serviceUuid: string, since: number = 0, offerId?: string): Promise<{ candidates: IceCandidate[]; offerId: string }> {
+        const url = new URL(`${this.baseUrl}/services/${serviceUuid}/ice-candidates`)
+        url.searchParams.set('since', since.toString())
+        if (offerId) {
+            url.searchParams.set('offerId', offerId)
+        }
+
+        const response = await fetch(url.toString(), { headers: this.getAuthHeader() })
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to get ICE candidates: ${error.error || response.statusText}`)
+        }
+
+        const data = await response.json()
+        return {
+            candidates: data.candidates || [],
+            offerId: data.offerId
+        }
+    }
+
+    // ============================================
+    // Services
+    // ============================================
+
+    /**
+     * Publish a service
+     */
+    async publishService(service: ServiceRequest): Promise<Service> {
+        const response = await fetch(`${this.baseUrl}/users/${encodeURIComponent(service.username)}/services`, {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json',
+                ...this.getAuthHeader(),
+            },
+            body: JSON.stringify(service),
+        })
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to publish service: ${error.error || response.statusText}`)
+        }
+
+        return await response.json()
+    }
+
+    /**
+     * Get service by UUID
+     */
+    async getService(uuid: string): Promise<Service & { offerId: string; sdp: string }> {
+        const response = await fetch(`${this.baseUrl}/services/${uuid}`, {
+            headers: this.getAuthHeader(),
+        })
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to get service: ${error.error || response.statusText}`)
+        }
+
+        return await response.json()
+    }
+
+    /**
+     * Search services by username - lists all services for a username
+     */
+    async searchServicesByUsername(username: string): Promise<Service[]> {
+        const response = await fetch(
+            `${this.baseUrl}/users/${encodeURIComponent(username)}/services`,
+            { headers: this.getAuthHeader() }
+        )
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to search services: ${error.error || response.statusText}`)
+        }
+
+        const data = await response.json()
+        return data.services || []
+    }
+
+    /**
+     * Search services by username AND FQN - returns full service details
+     */
+    async searchServices(username: string, serviceFqn: string): Promise<Service[]> {
+        const response = await fetch(
+            `${this.baseUrl}/users/${encodeURIComponent(username)}/services/${encodeURIComponent(serviceFqn)}`,
+            { headers: this.getAuthHeader() }
+        )
+
+        if (!response.ok) {
+            if (response.status === 404) {
+                return []
+            }
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to search services: ${error.error || response.statusText}`)
+        }
+
+        const service = await response.json()
+        return [service]
+    }
+
+    // ============================================
+    // Usernames
+    // ============================================
+
+    /**
+     * Check if username is available
+     */
+    async checkUsername(username: string): Promise<{ available: boolean; owner?: string }> {
+        const response = await fetch(
+            `${this.baseUrl}/users/${encodeURIComponent(username)}`
+        )
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to check username: ${error.error || response.statusText}`)
+        }
+
+        return await response.json()
+    }
+
+    /**
+     * Claim a username (requires Ed25519 signature)
+     */
+    async claimUsername(
+        username: string,
+        publicKey: string,
+        signature: string,
+        message: string
+    ): Promise<{ success: boolean; username: string }> {
+        const response = await fetch(`${this.baseUrl}/users/${encodeURIComponent(username)}`, {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json',
+                ...this.getAuthHeader(),
+            },
+            body: JSON.stringify({
+                publicKey,
+                signature,
+                message,
+            }),
+        })
+
+        if (!response.ok) {
+            const error = await response.json().catch(() => ({ error: 'Unknown error' }))
+            throw new Error(`Failed to claim username: ${error.error || response.statusText}`)
+        }
+
+        return await response.json()
+    }
+}

src/bin.ts

@@ -0,0 +1,42 @@
+/**
+ * Binnable - A cleanup function that can be synchronous or asynchronous
+ *
+ * Used to unsubscribe from events, close connections, or perform other cleanup operations.
+ */
+export type Binnable = () => void | Promise<void>
+
+/**
+ * Create a cleanup function collector (garbage bin)
+ *
+ * Collects cleanup functions and provides a single `clean()` method to execute all of them.
+ * Useful for managing multiple cleanup operations in a single place.
+ *
+ * @returns A function that accepts cleanup functions and has a `clean()` method
+ *
+ * @example
+ * ```typescript
+ * const bin = createBin();
+ *
+ * // Add cleanup functions
+ * bin(
+ *   () => console.log('Cleanup 1'),
+ *   () => connection.close(),
+ *   () => clearInterval(timer)
+ * );
+ *
+ * // Later, clean everything
+ * bin.clean(); // Executes all cleanup functions
+ * ```
+ */
+export const createBin = () => {
+    const bin: Binnable[] = []
+    return Object.assign((...rubbish: Binnable[]) => bin.push(...rubbish), {
+        /**
+         * Execute all cleanup functions and clear the bin
+         */
+        clean: (): void => {
+            bin.forEach(binnable => binnable())
+            bin.length = 0
+        },
+    })
+}

src/connection-manager.ts

@@ -1,9 +0,0 @@
-/**
- * ConnectionManager - Manages WebRTC peer connections
- */
-
-export class ConnectionManager {
-  constructor() {
-    // TODO: Initialize connection manager
-  }
-}

src/durable-connection.ts

@@ -0,0 +1,290 @@
+import {
+    ConnectionEvents,
+    ConnectionInterface,
+    ConnectionStates,
+    isConnectionState,
+    Message,
+    QueueMessageOptions,
+    Signaler,
+} from './types.js'
+import { EventBus } from './event-bus.js'
+import { createBin } from './bin.js'
+import { WebRTCContext } from './webrtc-context'
+
+export type WebRTCRondevuConnectionOptions = {
+    offer?: RTCSessionDescriptionInit | null
+    context: WebRTCContext
+    signaler: Signaler
+}
+
+/**
+ * WebRTCRondevuConnection - WebRTC peer connection wrapper with Rondevu signaling
+ *
+ * Manages a WebRTC peer connection lifecycle including:
+ * - Automatic offer/answer creation based on role
+ * - ICE candidate exchange via Rondevu signaling server
+ * - Connection state management with type-safe events
+ * - Data channel creation and message handling
+ *
+ * The connection automatically determines its role (offerer or answerer) based on whether
+ * an offer is provided in the constructor. The offerer creates the data channel, while
+ * the answerer receives it via the 'datachannel' event.
+ *
+ * @example
+ * ```typescript
+ * // Offerer side (creates offer)
+ * const connection = new WebRTCRondevuConnection(
+ *   'conn-123',
+ *   'peer-username',
+ *   'chat.service@1.0.0'
+ * );
+ *
+ * await connection.ready; // Wait for local offer
+ * const sdp = connection.connection.localDescription!.sdp!;
+ * // Send sdp to signaling server...
+ *
+ * // Answerer side (receives offer)
+ * const connection = new WebRTCRondevuConnection(
+ *   'conn-123',
+ *   'peer-username',
+ *   'chat.service@1.0.0',
+ *   { type: 'offer', sdp: remoteOfferSdp }
+ * );
+ *
+ * await connection.ready; // Wait for local answer
+ * const answerSdp = connection.connection.localDescription!.sdp!;
+ * // Send answer to signaling server...
+ *
+ * // Both sides: Set up signaler and listen for state changes
+ * connection.setSignaler(signaler);
+ * connection.events.on('state-change', (state) => {
+ *   console.log('Connection state:', state);
+ * });
+ * ```
+ */
+export class RTCDurableConnection implements ConnectionInterface {
+    private readonly side: 'offer' | 'answer'
+    public readonly expiresAt: number = 0
+    public readonly lastActive: number = 0
+    public readonly events: EventBus<ConnectionEvents> = new EventBus()
+    public readonly ready: Promise<void>
+    private iceBin = createBin()
+    private context: WebRTCContext
+    private readonly signaler: Signaler
+    private _conn: RTCPeerConnection | null = null
+    private _state: ConnectionInterface['state'] = 'disconnected'
+    private _dataChannel: RTCDataChannel | null = null
+    private messageQueue: Array<{
+        message: Message
+        options: QueueMessageOptions
+        timestamp: number
+    }> = []
+
+    constructor({ context, offer, signaler }: WebRTCRondevuConnectionOptions) {
+        this.context = context
+        this.signaler = signaler
+        this._conn = context.createPeerConnection()
+        this.side = offer ? 'answer' : 'offer'
+
+        // setup data channel
+        if (offer) {
+            this._conn.addEventListener('datachannel', e => {
+                this._dataChannel = e.channel
+                this.setupDataChannelListeners(this._dataChannel)
+            })
+        } else {
+            this._dataChannel = this._conn.createDataChannel('vu.ronde.protocol')
+            this.setupDataChannelListeners(this._dataChannel)
+        }
+
+        // setup description exchange
+        this.ready = offer
+            ? this._conn
+                  .setRemoteDescription(offer)
+                  .then(() => this._conn?.createAnswer())
+                  .then(async answer => {
+                      if (!answer || !this._conn) throw new Error('Connection disappeared')
+                      await this._conn.setLocalDescription(answer)
+                      return await signaler.setAnswer(answer)
+                  })
+            : this._conn.createOffer().then(async offer => {
+                  if (!this._conn) throw new Error('Connection disappeared')
+                  await this._conn.setLocalDescription(offer)
+                  return await signaler.setOffer(offer)
+              })
+
+        // propagate connection state changes
+        this._conn.addEventListener('connectionstatechange', () => {
+            console.log(this.side, 'connection state changed: ', this._conn!.connectionState)
+            const state = isConnectionState(this._conn!.connectionState)
+                ? this._conn!.connectionState
+                : 'disconnected'
+            this.setState(state)
+        })
+
+        this._conn.addEventListener('iceconnectionstatechange', () => {
+            console.log(this.side, 'ice connection state changed: ', this._conn!.iceConnectionState)
+        })
+
+        // start ICE candidate exchange when gathering begins
+        this._conn.addEventListener('icegatheringstatechange', () => {
+            if (this._conn!.iceGatheringState === 'gathering') {
+                this.startIce()
+            } else if (this._conn!.iceGatheringState === 'complete') {
+                this.stopIce()
+            }
+        })
+    }
+
+    /**
+     * Getter method for retrieving the current connection.
+     *
+     * @return {RTCPeerConnection|null} The current connection instance.
+     */
+    public get connection(): RTCPeerConnection | null {
+        return this._conn
+    }
+
+    /**
+     * Update connection state and emit state-change event
+     */
+    private setState(state: ConnectionInterface['state']) {
+        this._state = state
+        this.events.emit('state-change', state)
+    }
+
+    /**
+     * Start ICE candidate exchange when gathering begins
+     */
+    private startIce() {
+        const listener = ({ candidate }: { candidate: RTCIceCandidate | null }) => {
+            if (candidate) this.signaler.addIceCandidate(candidate)
+        }
+        if (!this._conn) throw new Error('Connection disappeared')
+        this._conn.addEventListener('icecandidate', listener)
+        this.iceBin(
+            this.signaler.addListener((candidate: RTCIceCandidate) =>
+                this._conn?.addIceCandidate(candidate)
+            ),
+            () => this._conn?.removeEventListener('icecandidate', listener)
+        )
+    }
+
+    /**
+     * Stop ICE candidate exchange when gathering completes
+     */
+    private stopIce() {
+        this.iceBin.clean()
+    }
+
+    /**
+     * Disconnects the current connection and cleans up resources.
+     * Closes the active connection if it exists, resets the connection instance to null,
+     * stops the ICE process, and updates the state to 'disconnected'.
+     *
+     * @return {void} No return value.
+     */
+    disconnect(): void {
+        this._conn?.close()
+        this._conn = null
+        this.stopIce()
+        this.setState('disconnected')
+    }
+
+    /**
+     * Current connection state
+     */
+    get state() {
+        return this._state
+    }
+
+    /**
+     * Setup data channel event listeners
+     */
+    private setupDataChannelListeners(channel: RTCDataChannel): void {
+        channel.addEventListener('message', e => {
+            this.events.emit('message', e.data)
+        })
+
+        channel.addEventListener('open', () => {
+            // Channel opened - flush queued messages
+            this.flushQueue().catch(err => {
+                console.error('Failed to flush message queue:', err)
+            })
+        })
+
+        channel.addEventListener('error', err => {
+            console.error('Data channel error:', err)
+        })
+
+        channel.addEventListener('close', () => {
+            console.log('Data channel closed')
+        })
+    }
+
+    /**
+     * Flush the message queue
+     */
+    private async flushQueue(): Promise<void> {
+        while (this.messageQueue.length > 0 && this._state === 'connected') {
+            const item = this.messageQueue.shift()!
+
+            // Check expiration
+            if (item.options.expiresAt && Date.now() > item.options.expiresAt) {
+                continue
+            }
+
+            const success = await this.sendMessage(item.message)
+            if (!success) {
+                // Re-queue on failure
+                this.messageQueue.unshift(item)
+                break
+            }
+        }
+    }
+
+    /**
+     * Queue a message for sending when connection is established
+     *
+     * @param message - Message to queue (string or ArrayBuffer)
+     * @param options - Queue options (e.g., expiration time)
+     */
+    async queueMessage(message: Message, options: QueueMessageOptions = {}): Promise<void> {
+        this.messageQueue.push({
+            message,
+            options,
+            timestamp: Date.now()
+        })
+
+        // Try immediate send if connected
+        if (this._state === 'connected') {
+            await this.flushQueue()
+        }
+    }
+
+    /**
+     * Send a message immediately
+     *
+     * @param message - Message to send (string or ArrayBuffer)
+     * @returns Promise resolving to true if sent successfully
+     */
+    async sendMessage(message: Message): Promise<boolean> {
+        if (this._state !== 'connected' || !this._dataChannel) {
+            return false
+        }
+
+        if (this._dataChannel.readyState !== 'open') {
+            return false
+        }
+
+        try {
+            // TypeScript has trouble with the union type, so we cast to any
+            // Both string and ArrayBuffer are valid for RTCDataChannel.send()
+            this._dataChannel.send(message as any)
+            return true
+        } catch (err) {
+            console.error('Send failed:', err)
+            return false
+        }
+    }
+}

src/event-bus.ts

@@ -2,7 +2,7 @@
  * Type-safe EventBus with event name to payload type mapping
  */
 
-type EventHandler<T = any> = (data: T) => void;
+type EventHandler<T = any> = (data: T) => void
 
 /**
  * EventBus - Type-safe event emitter with inferred event data types
@@ -27,20 +27,24 @@ type EventHandler<T = any> = (data: T) => void;
  * });
  */
 export class EventBus<TEvents extends Record<string, any>> {
-  private handlers: Map<keyof TEvents, Set<EventHandler>>;
+    private handlers: Map<keyof TEvents, Set<EventHandler>>
 
     constructor() {
-    this.handlers = new Map();
+        this.handlers = new Map()
     }
 
     /**
      * Subscribe to an event
+     * Returns a cleanup function to unsubscribe
      */
-  on<K extends keyof TEvents>(event: K, handler: EventHandler<TEvents[K]>): void {
+    on<K extends keyof TEvents>(event: K, handler: EventHandler<TEvents[K]>): () => void {
         if (!this.handlers.has(event)) {
-      this.handlers.set(event, new Set());
+            this.handlers.set(event, new Set())
         }
-    this.handlers.get(event)!.add(handler);
+        this.handlers.get(event)!.add(handler)
+
+        // Return cleanup function
+        return () => this.off(event, handler)
     }
 
     /**
@@ -48,21 +52,21 @@ export class EventBus<TEvents extends Record<string, any>> {
      */
     once<K extends keyof TEvents>(event: K, handler: EventHandler<TEvents[K]>): void {
         const wrappedHandler = (data: TEvents[K]) => {
-      handler(data);
+            handler(data)
-      this.off(event, wrappedHandler);
+            this.off(event, wrappedHandler)
-    };
+        }
-    this.on(event, wrappedHandler);
+        this.on(event, wrappedHandler)
     }
 
     /**
      * Unsubscribe from an event
      */
     off<K extends keyof TEvents>(event: K, handler: EventHandler<TEvents[K]>): void {
-    const eventHandlers = this.handlers.get(event);
+        const eventHandlers = this.handlers.get(event)
         if (eventHandlers) {
-      eventHandlers.delete(handler);
+            eventHandlers.delete(handler)
             if (eventHandlers.size === 0) {
-        this.handlers.delete(event);
+                this.handlers.delete(event)
             }
         }
     }
@@ -71,9 +75,9 @@ export class EventBus<TEvents extends Record<string, any>> {
      * Emit an event with data
      */
     emit<K extends keyof TEvents>(event: K, data: TEvents[K]): void {
-    const eventHandlers = this.handlers.get(event);
+        const eventHandlers = this.handlers.get(event)
         if (eventHandlers) {
-      eventHandlers.forEach(handler => handler(data));
+            eventHandlers.forEach(handler => handler(data))
         }
     }
 
@@ -82,23 +86,9 @@ export class EventBus<TEvents extends Record<string, any>> {
      */
     clear<K extends keyof TEvents>(event?: K): void {
         if (event !== undefined) {
-      this.handlers.delete(event);
+            this.handlers.delete(event)
         } else {
-      this.handlers.clear();
+            this.handlers.clear()
         }
     }
-
-  /**
-   * Get count of handlers for an event
-   */
-  listenerCount<K extends keyof TEvents>(event: K): number {
-    return this.handlers.get(event)?.size ?? 0;
-  }
-
-  /**
-   * Get all event names that have handlers
-   */
-  eventNames(): Array<keyof TEvents> {
-    return Array.from(this.handlers.keys());
-  }
 }

src/index.ts

@@ -3,14 +3,42 @@
  * WebRTC peer signaling client
  */
 
-export { ConnectionManager } from './connection-manager.js';
+export { EventBus } from './event-bus.js'
-export { EventBus } from './event-bus.js';
+export { RondevuAPI } from './api.js'
+export { RondevuService } from './rondevu-service.js'
+export { RondevuSignaler } from './rondevu-signaler.js'
+export { WebRTCContext } from './webrtc-context.js'
+export { RTCDurableConnection } from './durable-connection'
+export { ServiceHost } from './service-host.js'
+export { ServiceClient } from './service-client.js'
+export { createBin } from './bin.js'
 
 // Export types
 export type {
-  ConnectionIdentity,
-  ConnectionState,
     ConnectionInterface,
-  Connection,
+    QueueMessageOptions,
-  QueueMessageOptions
+    Message,
-} from './types.js';
+    ConnectionEvents,
+    Signaler,
+} from './types.js'
+
+export type {
+    Credentials,
+    Keypair,
+    OfferRequest,
+    Offer,
+    ServiceRequest,
+    Service,
+    IceCandidate,
+} from './api.js'
+
+export type { Binnable } from './bin.js'
+
+export type { RondevuServiceOptions, PublishServiceOptions } from './rondevu-service.js'
+
+export type { ServiceHostOptions, ServiceHostEvents } from './service-host.js'
+
+export type { ServiceClientOptions, ServiceClientEvents } from './service-client.js'
+
+export type { PollingConfig } from './rondevu-signaler.js'
+

src/rondevu-service.ts

@@ -0,0 +1,175 @@
+import { RondevuAPI, Credentials, Keypair, Service, ServiceRequest } from './api.js'
+
+export interface RondevuServiceOptions {
+    apiUrl: string
+    username: string
+    keypair?: Keypair
+    credentials?: Credentials
+}
+
+export interface PublishServiceOptions {
+    serviceFqn: string
+    offers: Array<{ sdp: string }>
+    ttl?: number
+    isPublic?: boolean
+    metadata?: Record<string, any>
+}
+
+/**
+ * RondevuService - High-level service management with automatic signature handling
+ *
+ * Provides a simplified API for:
+ * - Username claiming with Ed25519 signatures
+ * - Service publishing with automatic signature generation
+ * - Keypair management
+ *
+ * @example
+ * ```typescript
+ * // Initialize service (generates keypair automatically)
+ * const service = new RondevuService({
+ *   apiUrl: 'https://signal.example.com',
+ *   username: 'myusername',
+ * })
+ *
+ * await service.initialize()
+ *
+ * // Claim username (one time)
+ * await service.claimUsername()
+ *
+ * // Publish a service
+ * const publishedService = await service.publishService({
+ *   serviceFqn: 'chat.app@1.0.0',
+ *   offers: [{ sdp: offerSdp }],
+ *   ttl: 300000,
+ *   isPublic: true,
+ * })
+ * ```
+ */
+export class RondevuService {
+    private readonly api: RondevuAPI
+    private readonly username: string
+    private keypair: Keypair | null = null
+    private usernameClaimed = false
+
+    constructor(options: RondevuServiceOptions) {
+        this.username = options.username
+        this.keypair = options.keypair || null
+        this.api = new RondevuAPI(options.apiUrl, options.credentials)
+    }
+
+    /**
+     * Initialize the service - generates keypair if not provided
+     * Call this before using other methods
+     */
+    async initialize(): Promise<void> {
+        if (!this.keypair) {
+            this.keypair = await RondevuAPI.generateKeypair()
+        }
+
+        // Register with API if no credentials provided
+        if (!this.api['credentials']) {
+            const credentials = await this.api.register()
+            this.api.setCredentials(credentials)
+        }
+    }
+
+    /**
+     * Claim the username with Ed25519 signature
+     * Should be called once before publishing services
+     */
+    async claimUsername(): Promise<void> {
+        if (!this.keypair) {
+            throw new Error('Service not initialized. Call initialize() first.')
+        }
+
+        // Check if username is already claimed
+        const check = await this.api.checkUsername(this.username)
+        if (!check.available) {
+            // Verify it's claimed by us
+            if (check.owner === this.keypair.publicKey) {
+                this.usernameClaimed = true
+                return
+            }
+            throw new Error(`Username "${this.username}" is already claimed by another user`)
+        }
+
+        // Generate signature for username claim
+        const message = `claim:${this.username}:${Date.now()}`
+        const signature = await RondevuAPI.signMessage(message, this.keypair.privateKey)
+
+        // Claim the username
+        await this.api.claimUsername(this.username, this.keypair.publicKey, signature, message)
+        this.usernameClaimed = true
+    }
+
+    /**
+     * Publish a service with automatic signature generation
+     */
+    async publishService(options: PublishServiceOptions): Promise<Service> {
+        if (!this.keypair) {
+            throw new Error('Service not initialized. Call initialize() first.')
+        }
+
+        if (!this.usernameClaimed) {
+            throw new Error(
+                'Username not claimed. Call claimUsername() first or the server will reject the service.'
+            )
+        }
+
+        const { serviceFqn, offers, ttl, isPublic, metadata } = options
+
+        // Generate signature for service publication
+        const message = `publish:${this.username}:${serviceFqn}:${Date.now()}`
+        const signature = await RondevuAPI.signMessage(message, this.keypair.privateKey)
+
+        // Create service request
+        const serviceRequest: ServiceRequest = {
+            username: this.username,
+            serviceFqn,
+            offers,
+            signature,
+            message,
+            ttl,
+            isPublic,
+            metadata,
+        }
+
+        // Publish to server
+        return await this.api.publishService(serviceRequest)
+    }
+
+    /**
+     * Get the current keypair (for backup/storage)
+     */
+    getKeypair(): Keypair | null {
+        return this.keypair
+    }
+
+    /**
+     * Get the username
+     */
+    getUsername(): string {
+        return this.username
+    }
+
+    /**
+     * Get the public key
+     */
+    getPublicKey(): string | null {
+        return this.keypair?.publicKey || null
+    }
+
+    /**
+     * Check if username has been claimed
+     */
+    isUsernameClaimed(): boolean {
+        return this.usernameClaimed
+    }
+
+    /**
+     * Access to underlying API for advanced operations
+     */
+    getAPI(): RondevuAPI {
+        return this.api
+    }
+}

src/rondevu-signaler.ts

@@ -0,0 +1,462 @@
+import { Signaler } from './types.js'
+import { RondevuService } from './rondevu-service.js'
+import { Binnable } from './bin.js'
+
+export interface PollingConfig {
+    initialInterval?: number     // Default: 500ms
+    maxInterval?: number          // Default: 5000ms
+    backoffMultiplier?: number    // Default: 1.5
+    maxRetries?: number           // Default: 50 (50 seconds max)
+    jitter?: boolean              // Default: true
+}
+
+/**
+ * RondevuSignaler - Handles WebRTC signaling via Rondevu service
+ *
+ * Manages offer/answer exchange and ICE candidate polling for establishing
+ * WebRTC connections through the Rondevu signaling server.
+ *
+ * Supports configurable polling with exponential backoff and jitter to reduce
+ * server load and prevent thundering herd issues.
+ *
+ * @example
+ * ```typescript
+ * const signaler = new RondevuSignaler(
+ *   rondevuService,
+ *   'chat.app@1.0.0',
+ *   'peer-username',
+ *   { initialInterval: 500, maxInterval: 5000, jitter: true }
+ * )
+ *
+ * // For offerer:
+ * await signaler.setOffer(offer)
+ * signaler.addAnswerListener(answer => {
+ *   // Handle remote answer
+ * })
+ *
+ * // For answerer:
+ * signaler.addOfferListener(offer => {
+ *   // Handle remote offer
+ * })
+ * await signaler.setAnswer(answer)
+ * ```
+ */
+export class RondevuSignaler implements Signaler {
+    private offerId: string | null = null
+    private serviceUuid: string | null = null
+    private offerListeners: Array<(offer: RTCSessionDescriptionInit) => void> = []
+    private answerListeners: Array<(answer: RTCSessionDescriptionInit) => void> = []
+    private iceListeners: Array<(candidate: RTCIceCandidate) => void> = []
+    private answerPollingTimeout: ReturnType<typeof setTimeout> | null = null
+    private icePollingTimeout: ReturnType<typeof setTimeout> | null = null
+    private lastIceTimestamp = 0
+    private isPolling = false
+    private pollingConfig: Required<PollingConfig>
+
+    constructor(
+        private readonly rondevu: RondevuService,
+        private readonly service: string,
+        private readonly host?: string,
+        pollingConfig?: PollingConfig
+    ) {
+        this.pollingConfig = {
+            initialInterval: pollingConfig?.initialInterval ?? 500,
+            maxInterval: pollingConfig?.maxInterval ?? 5000,
+            backoffMultiplier: pollingConfig?.backoffMultiplier ?? 1.5,
+            maxRetries: pollingConfig?.maxRetries ?? 50,
+            jitter: pollingConfig?.jitter ?? true
+        }
+    }
+
+    /**
+     * Publish an offer as a service
+     * Used by the offerer to make their offer available
+     */
+    async setOffer(offer: RTCSessionDescriptionInit): Promise<void> {
+        if (!offer.sdp) {
+            throw new Error('Offer SDP is required')
+        }
+
+        // Publish service with the offer SDP
+        const publishedService = await this.rondevu.publishService({
+            serviceFqn: this.service,
+            offers: [{ sdp: offer.sdp }],
+            ttl: 300000, // 5 minutes
+            isPublic: true,
+        })
+
+        // Get the first offer from the published service
+        if (!publishedService.offers || publishedService.offers.length === 0) {
+            throw new Error('No offers returned from service publication')
+        }
+
+        this.offerId = publishedService.offers[0].offerId
+        this.serviceUuid = publishedService.uuid
+
+        // Start polling for answer
+        this.startAnswerPolling()
+
+        // Start polling for ICE candidates
+        this.startIcePolling()
+    }
+
+    /**
+     * Send an answer to the offerer
+     * Used by the answerer to respond to an offer
+     */
+    async setAnswer(answer: RTCSessionDescriptionInit): Promise<void> {
+        if (!answer.sdp) {
+            throw new Error('Answer SDP is required')
+        }
+
+        if (!this.serviceUuid) {
+            throw new Error('No service UUID available. Must receive offer first.')
+        }
+
+        // Send answer to the service
+        const result = await this.rondevu.getAPI().answerService(this.serviceUuid, answer.sdp)
+        this.offerId = result.offerId
+
+        // Start polling for ICE candidates
+        this.startIcePolling()
+    }
+
+    /**
+     * Listen for incoming offers
+     * Used by the answerer to receive offers from the offerer
+     */
+    addOfferListener(callback: (offer: RTCSessionDescriptionInit) => void): Binnable {
+        this.offerListeners.push(callback)
+
+        // If we have a host, start searching for their service
+        if (this.host && !this.isPolling) {
+            this.searchForOffer()
+        }
+
+        // Return cleanup function
+        return () => {
+            const index = this.offerListeners.indexOf(callback)
+            if (index > -1) {
+                this.offerListeners.splice(index, 1)
+            }
+        }
+    }
+
+    /**
+     * Listen for incoming answers
+     * Used by the offerer to receive the answer from the answerer
+     */
+    addAnswerListener(callback: (answer: RTCSessionDescriptionInit) => void): Binnable {
+        this.answerListeners.push(callback)
+
+        // Return cleanup function
+        return () => {
+            const index = this.answerListeners.indexOf(callback)
+            if (index > -1) {
+                this.answerListeners.splice(index, 1)
+            }
+        }
+    }
+
+    /**
+     * Send an ICE candidate to the remote peer
+     */
+    async addIceCandidate(candidate: RTCIceCandidate): Promise<void> {
+        if (!this.serviceUuid) {
+            console.warn('Cannot send ICE candidate: no service UUID')
+            return
+        }
+
+        const candidateData = candidate.toJSON()
+
+        // Skip empty candidates
+        if (!candidateData.candidate || candidateData.candidate === '') {
+            return
+        }
+
+        try {
+            const result = await this.rondevu.getAPI().addServiceIceCandidates(
+                this.serviceUuid,
+                [candidateData],
+                this.offerId || undefined
+            )
+            // Store offerId if we didn't have it yet
+            if (!this.offerId) {
+                this.offerId = result.offerId
+            }
+        } catch (err) {
+            console.error('Failed to send ICE candidate:', err)
+        }
+    }
+
+    /**
+     * Listen for ICE candidates from the remote peer
+     */
+    addListener(callback: (candidate: RTCIceCandidate) => void): Binnable {
+        this.iceListeners.push(callback)
+
+        // Return cleanup function
+        return () => {
+            const index = this.iceListeners.indexOf(callback)
+            if (index > -1) {
+                this.iceListeners.splice(index, 1)
+            }
+        }
+    }
+
+    /**
+     * Search for an offer from the host
+     * Used by the answerer to find the offerer's service
+     */
+    private async searchForOffer(): Promise<void> {
+        if (!this.host) {
+            throw new Error('No host specified for offer search')
+        }
+
+        this.isPolling = true
+
+        try {
+            // Search for services by username and service FQN
+            const services = await this.rondevu.getAPI().searchServices(this.host, this.service)
+
+            if (services.length === 0) {
+                console.warn(`No services found for ${this.host}/${this.service}`)
+                this.isPolling = false
+                return
+            }
+
+            // Get the first available service (already has full details from searchServices)
+            const service = services[0] as any
+
+            // Get the first available offer from the service
+            if (!service.offers || service.offers.length === 0) {
+                console.warn(`No offers available for service ${this.host}/${this.service}`)
+                this.isPolling = false
+                return
+            }
+
+            const firstOffer = service.offers[0]
+            this.offerId = firstOffer.offerId
+            this.serviceUuid = service.uuid
+
+            // Notify offer listeners
+            const offer: RTCSessionDescriptionInit = {
+                type: 'offer',
+                sdp: firstOffer.sdp,
+            }
+
+            this.offerListeners.forEach(listener => {
+                try {
+                    listener(offer)
+                } catch (err) {
+                    console.error('Offer listener error:', err)
+                }
+            })
+        } catch (err) {
+            console.error('Failed to search for offer:', err)
+            this.isPolling = false
+        }
+    }
+
+    /**
+     * Start polling for answer (offerer side) with exponential backoff
+     */
+    private startAnswerPolling(): void {
+        if (this.answerPollingTimeout || !this.serviceUuid) {
+            return
+        }
+
+        let interval = this.pollingConfig.initialInterval
+        let retries = 0
+
+        const poll = async () => {
+            if (!this.serviceUuid) {
+                this.stopAnswerPolling()
+                return
+            }
+
+            try {
+                const answer = await this.rondevu.getAPI().getServiceAnswer(this.serviceUuid)
+
+                if (answer && answer.sdp) {
+                    // Store offerId if we didn't have it yet
+                    if (!this.offerId) {
+                        this.offerId = answer.offerId
+                    }
+
+                    // Got answer - notify listeners and stop polling
+                    const answerDesc: RTCSessionDescriptionInit = {
+                        type: 'answer',
+                        sdp: answer.sdp,
+                    }
+
+                    this.answerListeners.forEach(listener => {
+                        try {
+                            listener(answerDesc)
+                        } catch (err) {
+                            console.error('Answer listener error:', err)
+                        }
+                    })
+
+                    // Stop polling once we get the answer
+                    this.stopAnswerPolling()
+                    return
+                }
+
+                // No answer yet - exponential backoff
+                retries++
+                if (retries > this.pollingConfig.maxRetries) {
+                    console.warn('Max retries reached for answer polling')
+                    this.stopAnswerPolling()
+                    return
+                }
+
+                interval = Math.min(
+                    interval * this.pollingConfig.backoffMultiplier,
+                    this.pollingConfig.maxInterval
+                )
+
+                // Add jitter to prevent thundering herd
+                const finalInterval = this.pollingConfig.jitter
+                    ? interval + Math.random() * 100
+                    : interval
+
+                this.answerPollingTimeout = setTimeout(poll, finalInterval)
+
+            } catch (err) {
+                // 404 is expected when answer isn't available yet
+                if (err instanceof Error && !err.message?.includes('404')) {
+                    console.error('Error polling for answer:', err)
+                }
+
+                // Retry with backoff
+                const finalInterval = this.pollingConfig.jitter
+                    ? interval + Math.random() * 100
+                    : interval
+                this.answerPollingTimeout = setTimeout(poll, finalInterval)
+            }
+        }
+
+        poll() // Start immediately
+    }
+
+    /**
+     * Stop polling for answer
+     */
+    private stopAnswerPolling(): void {
+        if (this.answerPollingTimeout) {
+            clearTimeout(this.answerPollingTimeout)
+            this.answerPollingTimeout = null
+        }
+    }
+
+    /**
+     * Start polling for ICE candidates with adaptive backoff
+     */
+    private startIcePolling(): void {
+        if (this.icePollingTimeout || !this.serviceUuid) {
+            return
+        }
+
+        let interval = this.pollingConfig.initialInterval
+
+        const poll = async () => {
+            if (!this.serviceUuid) {
+                this.stopIcePolling()
+                return
+            }
+
+            try {
+                const result = await this.rondevu
+                    .getAPI()
+                    .getServiceIceCandidates(this.serviceUuid, this.lastIceTimestamp, this.offerId || undefined)
+
+                // Store offerId if we didn't have it yet
+                if (!this.offerId) {
+                    this.offerId = result.offerId
+                }
+
+                let foundCandidates = false
+
+                for (const item of result.candidates) {
+                    if (item.candidate && item.candidate.candidate && item.candidate.candidate !== '') {
+                        foundCandidates = true
+                        try {
+                            const rtcCandidate = new RTCIceCandidate(item.candidate)
+
+                            this.iceListeners.forEach(listener => {
+                                try {
+                                    listener(rtcCandidate)
+                                } catch (err) {
+                                    console.error('ICE listener error:', err)
+                                }
+                            })
+
+                            this.lastIceTimestamp = item.createdAt
+                        } catch (err) {
+                            console.warn('Failed to process ICE candidate:', err)
+                            this.lastIceTimestamp = item.createdAt
+                        }
+                    } else {
+                        this.lastIceTimestamp = item.createdAt
+                    }
+                }
+
+                // If candidates found, reset interval to initial value
+                // Otherwise, increase interval with backoff
+                if (foundCandidates) {
+                    interval = this.pollingConfig.initialInterval
+                } else {
+                    interval = Math.min(
+                        interval * this.pollingConfig.backoffMultiplier,
+                        this.pollingConfig.maxInterval
+                    )
+                }
+
+                // Add jitter
+                const finalInterval = this.pollingConfig.jitter
+                    ? interval + Math.random() * 100
+                    : interval
+
+                this.icePollingTimeout = setTimeout(poll, finalInterval)
+
+            } catch (err) {
+                // 404/410 means offer expired, stop polling
+                if (err instanceof Error && (err.message?.includes('404') || err.message?.includes('410'))) {
+                    console.warn('Offer not found or expired, stopping ICE polling')
+                    this.stopIcePolling()
+                } else if (err instanceof Error && !err.message?.includes('404')) {
+                    console.error('Error polling for ICE candidates:', err)
+                    // Continue polling despite errors
+                    const finalInterval = this.pollingConfig.jitter
+                        ? interval + Math.random() * 100
+                        : interval
+                    this.icePollingTimeout = setTimeout(poll, finalInterval)
+                }
+            }
+        }
+
+        poll() // Start immediately
+    }
+
+    /**
+     * Stop polling for ICE candidates
+     */
+    private stopIcePolling(): void {
+        if (this.icePollingTimeout) {
+            clearTimeout(this.icePollingTimeout)
+            this.icePollingTimeout = null
+        }
+    }
+
+    /**
+     * Stop all polling and cleanup
+     */
+    dispose(): void {
+        this.stopAnswerPolling()
+        this.stopIcePolling()
+        this.offerListeners = []
+        this.answerListeners = []
+        this.iceListeners = []
+    }
+}

src/service-client.ts

@@ -0,0 +1,203 @@
+import { RondevuService } from './rondevu-service.js'
+import { RondevuSignaler } from './rondevu-signaler.js'
+import { WebRTCContext } from './webrtc-context.js'
+import { RTCDurableConnection } from './durable-connection.js'
+import { EventBus } from './event-bus.js'
+
+export interface ServiceClientOptions {
+    username: string                     // Host username
+    serviceFqn: string                  // e.g., 'chat.app@1.0.0'
+    rondevuService: RondevuService
+    autoReconnect?: boolean             // Default: true
+    maxReconnectAttempts?: number       // Default: 5
+    rtcConfiguration?: RTCConfiguration
+}
+
+export interface ServiceClientEvents {
+    connected: RTCDurableConnection
+    disconnected: void
+    reconnecting: { attempt: number; maxAttempts: number }
+    error: Error
+}
+
+/**
+ * ServiceClient - High-level wrapper for connecting to a WebRTC service
+ *
+ * Simplifies client connection by handling:
+ * - Service discovery
+ * - Offer/answer exchange
+ * - ICE candidate polling
+ * - Automatic reconnection
+ *
+ * @example
+ * ```typescript
+ * const client = new ServiceClient({
+ *     username: 'host-user',
+ *     serviceFqn: 'chat.app@1.0.0',
+ *     rondevuService: myService
+ * })
+ *
+ * client.events.on('connected', conn => {
+ *     conn.events.on('message', msg => console.log('Received:', msg))
+ *     conn.sendMessage('Hello from client!')
+ * })
+ *
+ * await client.connect()
+ * ```
+ */
+export class ServiceClient {
+    events: EventBus<ServiceClientEvents>
+
+    private signaler: RondevuSignaler | null = null
+    private webrtcContext: WebRTCContext
+    private connection: RTCDurableConnection | null = null
+    private autoReconnect: boolean
+    private maxReconnectAttempts: number
+    private reconnectAttempts = 0
+    private isConnecting = false
+
+    constructor(private options: ServiceClientOptions) {
+        this.events = new EventBus<ServiceClientEvents>()
+        this.webrtcContext = new WebRTCContext(options.rtcConfiguration)
+        this.autoReconnect = options.autoReconnect !== undefined ? options.autoReconnect : true
+        this.maxReconnectAttempts = options.maxReconnectAttempts || 5
+    }
+
+    /**
+     * Connect to the service
+     */
+    async connect(): Promise<RTCDurableConnection> {
+        if (this.isConnecting) {
+            throw new Error('Connection already in progress')
+        }
+
+        if (this.connection) {
+            throw new Error('Already connected. Disconnect first.')
+        }
+
+        this.isConnecting = true
+
+        try {
+            // Create signaler
+            this.signaler = new RondevuSignaler(
+                this.options.rondevuService,
+                this.options.serviceFqn,
+                this.options.username
+            )
+
+            // Wait for remote offer from signaler
+            const remoteOffer = await new Promise<RTCSessionDescriptionInit>((resolve, reject) => {
+                const timeout = setTimeout(() => {
+                    reject(new Error('Service discovery timeout'))
+                }, 30000)
+
+                this.signaler!.addOfferListener((offer) => {
+                    clearTimeout(timeout)
+                    resolve(offer)
+                })
+            })
+
+            // Create connection with remote offer (makes us the answerer)
+            const connection = new RTCDurableConnection({
+                context: this.webrtcContext,
+                signaler: this.signaler,
+                offer: remoteOffer
+            })
+
+            // Wait for connection to be ready
+            await connection.ready
+
+            // Set up connection event listeners
+            connection.events.on('state-change', (state) => {
+                if (state === 'connected') {
+                    this.reconnectAttempts = 0
+                    this.events.emit('connected', connection)
+                } else if (state === 'disconnected') {
+                    this.events.emit('disconnected', undefined)
+                    if (this.autoReconnect && this.reconnectAttempts < this.maxReconnectAttempts) {
+                        this.attemptReconnect()
+                    }
+                }
+            })
+
+            this.connection = connection
+            this.isConnecting = false
+
+            return connection
+
+        } catch (err) {
+            this.isConnecting = false
+            const error = err instanceof Error ? err : new Error(String(err))
+            this.events.emit('error', error)
+            throw error
+        }
+    }
+
+    /**
+     * Disconnect from the service
+     */
+    dispose(): void {
+        if (this.signaler) {
+            this.signaler.dispose()
+            this.signaler = null
+        }
+
+        if (this.connection) {
+            this.connection.disconnect()
+            this.connection = null
+        }
+
+        this.isConnecting = false
+        this.reconnectAttempts = 0
+    }
+
+    /**
+     * @deprecated Use dispose() instead
+     */
+    disconnect(): void {
+        this.dispose()
+    }
+
+    /**
+     * Attempt to reconnect
+     */
+    private async attemptReconnect(): Promise<void> {
+        this.reconnectAttempts++
+        this.events.emit('reconnecting', {
+            attempt: this.reconnectAttempts,
+            maxAttempts: this.maxReconnectAttempts
+        })
+
+        // Cleanup old connection
+        if (this.signaler) {
+            this.signaler.dispose()
+            this.signaler = null
+        }
+
+        if (this.connection) {
+            this.connection = null
+        }
+
+        // Wait a bit before reconnecting
+        await new Promise(resolve => setTimeout(resolve, 1000 * this.reconnectAttempts))
+
+        try {
+            await this.connect()
+        } catch (err) {
+            console.error('Reconnection attempt failed:', err)
+            if (this.reconnectAttempts < this.maxReconnectAttempts) {
+                this.attemptReconnect()
+            } else {
+                const error = new Error('Max reconnection attempts reached')
+                this.events.emit('error', error)
+            }
+        }
+    }
+
+    /**
+     * Get the current connection
+     */
+    getConnection(): RTCDurableConnection | null {
+        return this.connection
+    }
+}

src/service-host.ts

@@ -0,0 +1,158 @@
+import { RondevuService } from './rondevu-service.js'
+import { RondevuSignaler } from './rondevu-signaler.js'
+import { WebRTCContext } from './webrtc-context.js'
+import { RTCDurableConnection } from './durable-connection.js'
+import { EventBus } from './event-bus.js'
+
+export interface ServiceHostOptions {
+    service: string                      // e.g., 'chat.app@1.0.0'
+    rondevuService: RondevuService
+    maxPeers?: number                    // Default: 5
+    ttl?: number                         // Default: 300000 (5 min)
+    isPublic?: boolean                   // Default: true
+    rtcConfiguration?: RTCConfiguration
+    metadata?: Record<string, any>
+}
+
+export interface ServiceHostEvents {
+    connection: RTCDurableConnection
+    error: Error
+}
+
+/**
+ * ServiceHost - High-level wrapper for hosting a WebRTC service
+ *
+ * Simplifies hosting by handling:
+ * - Offer/answer exchange
+ * - ICE candidate polling
+ * - Connection pool management
+ * - Automatic reconnection
+ *
+ * @example
+ * ```typescript
+ * const host = new ServiceHost({
+ *     service: 'chat.app@1.0.0',
+ *     rondevuService: myService,
+ *     maxPeers: 5
+ * })
+ *
+ * host.events.on('connection', conn => {
+ *     conn.events.on('message', msg => console.log('Received:', msg))
+ *     conn.sendMessage('Hello!')
+ * })
+ *
+ * await host.start()
+ * ```
+ */
+export class ServiceHost {
+    events: EventBus<ServiceHostEvents>
+
+    private signaler: RondevuSignaler | null = null
+    private webrtcContext: WebRTCContext
+    private connections: RTCDurableConnection[] = []
+    private maxPeers: number
+    private running = false
+
+    constructor(private options: ServiceHostOptions) {
+        this.events = new EventBus<ServiceHostEvents>()
+        this.webrtcContext = new WebRTCContext(options.rtcConfiguration)
+        this.maxPeers = options.maxPeers || 5
+    }
+
+    /**
+     * Start hosting the service
+     */
+    async start(): Promise<void> {
+        if (this.running) {
+            throw new Error('ServiceHost already running')
+        }
+
+        this.running = true
+
+        // Create signaler
+        this.signaler = new RondevuSignaler(
+            this.options.rondevuService,
+            this.options.service
+        )
+
+        // Create first connection (offerer)
+        const connection = new RTCDurableConnection({
+            context: this.webrtcContext,
+            signaler: this.signaler,
+            offer: null  // null means we're the offerer
+        })
+
+        // Wait for connection to be ready
+        await connection.ready
+
+        // Set up connection event listeners
+        connection.events.on('state-change', (state) => {
+            if (state === 'connected') {
+                this.connections.push(connection)
+                this.events.emit('connection', connection)
+
+                // Create next connection if under maxPeers
+                if (this.connections.length < this.maxPeers) {
+                    this.createNextConnection().catch(err => {
+                        console.error('Failed to create next connection:', err)
+                        this.events.emit('error', err)
+                    })
+                }
+            } else if (state === 'disconnected') {
+                // Remove from connections list
+                const index = this.connections.indexOf(connection)
+                if (index > -1) {
+                    this.connections.splice(index, 1)
+                }
+            }
+        })
+
+        // Publish service with the offer
+        const offer = connection.connection?.localDescription
+        if (!offer?.sdp) {
+            throw new Error('Offer SDP is empty')
+        }
+
+        await this.signaler.setOffer(offer)
+    }
+
+    /**
+     * Create the next connection for incoming peers
+     */
+    private async createNextConnection(): Promise<void> {
+        if (!this.signaler || !this.running) {
+            return
+        }
+
+        // For now, we'll use the same offer for all connections
+        // In a production scenario, you'd create multiple offers
+        // This is a limitation of the current service model
+        // which publishes one offer per service
+    }
+
+    /**
+     * Stop hosting the service
+     */
+    dispose(): void {
+        this.running = false
+
+        // Cleanup signaler
+        if (this.signaler) {
+            this.signaler.dispose()
+            this.signaler = null
+        }
+
+        // Disconnect all connections
+        for (const conn of this.connections) {
+            conn.disconnect()
+        }
+        this.connections = []
+    }
+
+    /**
+     * Get all active connections
+     */
+    getConnections(): RTCDurableConnection[] {
+        return [...this.connections]
+    }
+}

src/types.ts

@@ -1,24 +1,44 @@
 /**
  * Core connection types
  */
+import { EventBus } from './event-bus.js'
+import { Binnable } from './bin.js'
 
-export interface ConnectionIdentity {
+export type Message = string | ArrayBuffer
-    id: string;
-    hostUsername: string;
-}
-
-export interface ConnectionState {
-    state: 'connected' | 'disconnected' | 'connecting';
-    lastActive: number;
-}
 
 export interface QueueMessageOptions {
-    expiresAt?: number;
+    expiresAt?: number
 }
 
+export interface ConnectionEvents {
+    'state-change': ConnectionInterface['state']
+    message: Message
+}
+
+export const ConnectionStates = [
+    'connected',
+    'disconnected',
+    'connecting'
+] as const
+
+export const isConnectionState = (state: string): state is (typeof ConnectionStates)[number] =>
+    ConnectionStates.includes(state as any)
+
 export interface ConnectionInterface {
-    queueMessage(message: string | ArrayBuffer, options?: QueueMessageOptions): void;
+    state: (typeof ConnectionStates)[number]
-    sendMessage(message: string | ArrayBuffer): void;
+    lastActive: number
+    expiresAt?: number
+    events: EventBus<ConnectionEvents>
+
+    queueMessage(message: Message, options?: QueueMessageOptions): Promise<void>
+    sendMessage(message: Message): Promise<boolean>
 }
 
-export type Connection = ConnectionIdentity & ConnectionState & ConnectionInterface;
+export interface Signaler {
+    addIceCandidate(candidate: RTCIceCandidate): Promise<void>
+    addListener(callback: (candidate: RTCIceCandidate) => void): Binnable
+    addOfferListener(callback: (offer: RTCSessionDescriptionInit) => void): Binnable
+    addAnswerListener(callback: (answer: RTCSessionDescriptionInit) => void): Binnable
+    setOffer(offer: RTCSessionDescriptionInit): Promise<void>
+    setAnswer(answer: RTCSessionDescriptionInit): Promise<void>
+}

src/webrtc-context.ts

@@ -0,0 +1,39 @@
+import { Signaler } from './types'
+
+const DEFAULT_RTC_CONFIGURATION: RTCConfiguration = {
+    iceServers: [
+        {
+            urls: 'stun:stun.relay.metered.ca:80',
+        },
+        {
+            urls: 'turn:standard.relay.metered.ca:80',
+            username: 'c53a9c971da5e6f3bc959d8d',
+            credential: 'QaccPqtPPaxyokXp',
+        },
+        {
+            urls: 'turn:standard.relay.metered.ca:80?transport=tcp',
+            username: 'c53a9c971da5e6f3bc959d8d',
+            credential: 'QaccPqtPPaxyokXp',
+        },
+        {
+            urls: 'turn:standard.relay.metered.ca:443',
+            username: 'c53a9c971da5e6f3bc959d8d',
+            credential: 'QaccPqtPPaxyokXp',
+        },
+        {
+            urls: 'turns:standard.relay.metered.ca:443?transport=tcp',
+            username: 'c53a9c971da5e6f3bc959d8d',
+            credential: 'QaccPqtPPaxyokXp',
+        },
+    ],
+}
+
+export class WebRTCContext {
+    constructor(
+        private readonly config?: RTCConfiguration
+    ) {}
+
+    createPeerConnection(): RTCPeerConnection {
+        return new RTCPeerConnection(this.config || DEFAULT_RTC_CONFIGURATION)
+    }
+}