startDiscovery method

@override Stream<BluetoothDiscoveryResult> startDiscovery()

Starts a real radio inquiry and streams sightings of nearby devices, paired or not. Cancelling the subscription (or calling stopDiscovery) aborts the inquiry on every backend.

Implementation

@override
Stream<BluetoothDiscoveryResult> startDiscovery() {
  late StreamController<BluetoothDiscoveryResult> controller;
  controller = StreamController<BluetoothDiscoveryResult>.broadcast(
    onListen: () {
      discoveryStarted = true;
      startDiscoveryCount++;
      _liveDiscoveries.add(controller);
      for (final r in discoveryResults) {
        controller.add(r);
      }
      if (discoveryError != null) controller.addError(discoveryError!);
      if (discoveryCompletes && !controller.isClosed) {
        unawaited(controller.close());
      }
    },
    onCancel: () {
      discoveryStopped = true;
      stopDiscoveryCount++;
      _liveDiscoveries.remove(controller);
    },
  );
  return controller.stream;
}