flutter - Firebase OnDisconnect Event

Question

so the question is about onDisconnect in firebase, I am implementing a chatapp like whatsapp in flutter and using Firebase, stuck at this point the onDisconnect event takes 2-3 mins to fire when you have no internet access:

1. I know it takes that lot of time, because it is waiting the sockets to timeout to nominate the user has completely disconnected

2. I tried using goOffline but with no luck, at least I wanted to make onDisconnect event to be fired faster.

3. I have a workaround by making a Timer in flutter and every X period I update with timestamp indicating that this user is alive, but the question is who will trigger the offline status for this user when he is offline? a cloud function, or another online connected user? Since, this user didn't respond in X period so we need to update his status to offline.

4. Is there any workaround for this issue?

Thanks in advance.

sample code I am using: in the initState() I am listening to /.info/connected:

 FirebaseDatabase.instance
        .reference()
        .child('/.info/connected')
        .onValue
        .listen((data) {
      print('bool value');
      print(data.snapshot.value);
      if (data.snapshot.value == false) {
        //user dc
        print('user disconnected');
        FirebaseDatabase.instance.goOffline().then((value) => print("offline"));
      } else {
        print('user reconnected');
        FirebaseDatabase.instance.goOnline().then((value) => print("user online again"));
        FirebaseDatabase.instance.reference().child('uid').onDisconnect().set({'status': 'offline'}).then((value) => print('here I am '));
      }
    });

Answer 1

Waitting for answers