handle room update message (#79)

lib/src/core/engine.dart

@@ -656,6 +656,8 @@ class Engine extends Disposable with EventsEmittable<EngineEvent> {
     ..on<SignalSubscribedQualityUpdatedEvent>((event) => events.emit(event))
     // relay to Room
     ..on<SignalSubscriptionPermissionUpdateEvent>((event) => events.emit(event))
+    // relay to Room
+    ..on<SignalRoomUpdateEvent>((event) => events.emit(event))
     ..on<SignalTokenUpdatedEvent>((event) {
       logger.fine('Server refreshed the token');
       token = event.token;

lib/src/core/room.dart

@@ -52,6 +52,9 @@ class Room extends DisposableChangeNotifier with EventsEmittable<RoomEvent> {
   /// sid of the room
   String? sid;
 
+  /// metadata of the room
+  String? metadata;
+
   /// Server version
   String? get serverVersion => _serverVersion;
   String? _serverVersion;
@@ -202,6 +205,10 @@ class Room extends DisposableChangeNotifier with EventsEmittable<RoomEvent> {
       //
       await publication.updateSubscriptionAllowed(event.allowed);
     })
+    ..on<SignalRoomUpdateEvent>((event) async {
+      metadata = event.room.metadata;
+      events.emit(RoomMetadataChangedEvent(metadata: event.room.metadata));
+    })
     ..on<EngineTrackAddedEvent>((event) async {
       logger.fine('EngineTrackAddedEvent trackSid:${event.track.id}');
 

lib/src/core/signal_client.dart

@@ -176,7 +176,7 @@ class SignalClient extends Disposable with EventsEmittable<SignalEvent> {
             SignalSpeakersChangedEvent(speakers: msg.speakersChanged.speakers));
         break;
       case lk_rtc.SignalResponse_Message.roomUpdate:
-        // TODO
+        events.emit(SignalRoomUpdateEvent(room: msg.roomUpdate.room));
         break;
       case lk_rtc.SignalResponse_Message.connectionQuality:
         events.emit(SignalConnectionQualityUpdateEvent(