discovery method

@override Stream<BluetoothDevice> discovery()

Starts scan for Bluetooth LE devices Note: This is a continuous behavior, don't forget to call stopDiscovery. Throw BTException if failed.

Implementation

@override
Stream<BluetoothDevice> discovery() async* {
  try {
    // Clear result
    _scanResults.add([]);
    await methodChannel.invokeMethod("startDiscovery");
    yield* _scanResultMethodStream.takeUntil(_stopScanPill)
        .doOnDone(stopDiscovery)
        .map((event) => event.arguments)
        .transform(StreamTransformer(_addDeviceTransform));
  } on BTException catch (_) {
    rethrow;
  } on PlatformException catch (e) {
    throw BTException.fromPlatform(e);
  }
}