You can use the streams service to get room info, then extract the room name in the roomAttributes object.

BDK 2.0:

bdk.datafeed().subscribe(new RealTimeEventListener() {
  @Override
  public void onMessageSent(V4Initiator initiator, V4MessageSent event) {
    String streamId = event.getMessage().getStream().getStreamId();
    String roomName = bdk.streams().getRoomInfo(streamId).getRoomAttributes().getName();
    bdk.messages().send(streamId, "Hello in room: " + roomName);
  }
}

SDK:

String streamId = msg.getStream().getStreamId();
String roomName = botClient.getStreamsClient()
    .getRoomInfo(streamId).getRoomAttributes().getName();
this.botClient.getMessagesClient().sendMessage(streamId,
    new OutboundMessage("Hello in room: " + roomName));

You can filter the payload to only include the rooms via parmaters such as "active": true, by modofying the body json:

question as extension to this one:

if I have few archived chat rooms which are not visible in deleop.symphony.com, how do I filter out these few archived / in-active chatrooms from returned data feed streams ?

thanks