import 'package:mcumgr/mcumgr.dart';

final client = Client(
    input: receiveStream, // bytes received from the device (Stream<List<int>>)
    output: (bytes) { /* send bytes (List<int>) to the device */ }
);

final serviceUuid = Guid('8d53dc1d-1db7-4cd3-868b-8a527460aa84');
final characteristicUuid = Guid('da2e7828-fbce-4e01-ae9e-261174997c48');

// Increase the Bluetooth MTU (this is important!)
await device.requestMtu(252);

// Find the service and its characteristic
final service = services.singleWhere((e) => e.uuid == serviceUuid);
final characteristic = service.characteristics.singleWhere((e) => e.uuid == characteristicUuid);

// Subscribe to messages from the device
await characteristic.setNotifyValue(true);

final client = Client(
  // Used to receive messages from the device
  input: characteristic.onValueChangedStream,
  // Used to send messages to the device
  output: (value) => characteristic.write(value, withoutResponse: true),
);