Does listenToBeacons say no beacons here?

[barangungor]

I have a problem wiht listenToBeacons. That's my code:

beaconEventsController.stream.listen((data) async {
print(data);
print('DATA');
print(_beacons.length);
_beacons.clear();
_beacons.add(json.decode(data));
print(_beacons);
}, onDone: () {
print('DONEEEEE');
}, onError: (error) {
print("Error: $error");
});

this stream's listen doesnt send data when there are no beacon. I should get data even if there are no beacons. How can i do that?

[baranacikgoz]

I had faced this question and find out stream's timeout feature can solve our problem. I've just changed the line starting with _beaconEventsController.stream...... to this;

_beaconEventsController.stream.timeout(const Duration(milliseconds: xxx),
        onTimeout: (_) {
      // No beacons found for xxx ms
    }).listen(
        (data) {
          // Didn't changed here
        },
        onDone: () {},
        onError: (error) {
          print("Error: $error");
        });