What is the proper way to subscribe on the events in SignalR?

[ingvilow]

I want to subscribe on events using signal r and using sound effect when these events happens. How can I create this in Dart? I am trying to create such logic: when a new id appears in websocket, a sound starts playing. In docs to signal r it only says that i should using hubconnection.on, but I don't understand how can I bond the new id and sound. And as sample they gave me this JS code above. Or may be I should use only argumet without object?

In Dart it looks like that. I have sample with data: data: {id: '1234', date: '2022-08-29T12:05:27.770Z', base: 'BaseNameExample', additionInfo: 'there is no example', dataId: '3fa85f64-5717-4562-b3fc-2c963f66afa6'},

and in Dart I am trying to do it like that using audioplayer:

class EventsSubsriber{
  Alarmplayer alarmplayer = Alarmplayer();

  Future<List> fetchNotifications() async {
    Logger.root.level = Level.ALL;
    Logger.root.onRecord.listen((LogRecord rec) {
      print('${rec.level.name}: ${rec.time}: ${rec.message}');
    });

    Logger? logger;

    final httpConnectionOptions = HttpConnectionOptions(
        accessTokenFactory: () => SharedPreferenceService().loginWithToken(),
        skipNegotiation: true,
        transport: HttpTransportType.WebSockets);

    final hubConnection = HubConnectionBuilder()
        .withUrl(
          'http://securelink/home',
          options: httpConnectionOptions,
        )
        .build();
    await hubConnection.start();
    List notifications= [];
    if (hubConnection.state == HubConnectionState.Connected) {
      await hubConnection
          .invoke('GetNotifications')
          .then((value) => notifications= value as List);
      await alarmplayer.Alarm(url: 'assets/notifSound.mp3', volume: 1);
      alarmplayer.IsPlaying();
    }
    hubConnection.on('GetNotifications', (arguments) {
      if (arguments!.isNotEmpty) {
        arguments == ['id'];
        arguments == ['date'];
        arguments == ['baseNameExample'];
        arguments == ['additionInfo'];
        alarmplayer.Alarm(url: 'assets/wanted.mp3', volume: 1);
        alarmplayer.IsPlaying();
      } else {
        alarmplayer.StopAlarm();
      }
    });
    // hubConnection.keepAliveIntervalInMilliseconds = 10 * 60 * 60 * 1000;
    hubConnection.onclose(({error}) {
      Logger.root.level = Level.ALL;
      Logger.root.onRecord.listen((LogRecord rec) {
        print('${rec.level.name}: ${rec.error}: ${rec.message}');
      });
      print(error);
    });
    print(notifications);
    return notifications;
  }
}