startNotify method

@override Future<bool?> startNotify({ required String serviceUuid, required String characteristicUuid, })

startNotify starts listening to notifications from a BLE characteristic. To stop listening, use stopNotify method and to get the notifications, use onNotify stream.

Implementation

@override
Future<bool?> startNotify({
  required String serviceUuid,
  required String characteristicUuid,
}) async {
  if (_currentConnected == null) {
    log("No device connected");
    return false;
  }

  final services = await _currentConnected!.discoverServices();
  final service = services.firstWhereOrNull((s) => s.uuid.toLowerCase() == serviceUuid.toLowerCase());
  if (service == null) {
    log("Service not found: $serviceUuid");
    return false;
  }

  try {
    final characteristic = await service.getCharacteristic(characteristicUuid);
    if (characteristic.isNotifying) {
      log("Already notifying");
      return true;
    }
    await characteristic.startNotifications();
    _notifications[characteristicUuid] = characteristic.value.listen((event) {
      _notifyController.add(BleCharacteristicNotification(
        serviceUuid: serviceUuid,
        characteristicUuid: characteristicUuid,
        value: event.buffer.asUint8List(),
      ));
    });
    return true;
  } catch (e) {
    log("Error getting characteristic: $e");
    return false;
  }
}