onRoomMessageReceived method
@detail callback
@brief Receive a callback for broadcast messages in the room.
This callback is received when other users in the room call sendRoomMessage{@link #RTSRoom#sendRoomMessage} to send a broadcast message.
@param uid User ID of the message sender.
@param message The content of the received message.
Implementation
FutureOr<void> onRoomMessageReceived(
long msgid, String uid, String message) async {}