onConnect method

@override Future<DeviceStatus> onConnect()

Callback on connect. Returns the DeviceStatus of the device.

Is to be overridden in sub-classes and implement device-specific connection.

Implementation

@override
Future<DeviceStatus> onConnect() async {
  try {
    // listen for connection events
    manager?.connectionEvents.listen((event) async {
      debug('$runtimeType - $event');

      switch (event.type) {
        case ConnectionType.connected:
          status = DeviceStatus.connected;

          await manager?.setSamplingRate(configuration?.samplingRate ?? 10);

          // when connected, listen for battery events
          _batterySubscription = manager!.eSenseEvents.listen((event) {
            if (event is BatteryRead) {
              _voltageLevel = event.voltage;
              if (batteryLevel != null) {
                _batteryEventController.add(batteryLevel!);
              }
            }
          });

          // set up a timer that asks for the voltage level
          _batteryTimer = Timer.periodic(const Duration(minutes: 2), (_) {
            if (status == DeviceStatus.connected) {
              manager?.getBatteryVoltage();
            }
          });
          break;
        case ConnectionType.unknown:
          status = DeviceStatus.unknown;
          break;
        case ConnectionType.device_found:
          status = DeviceStatus.connecting;
          break;
        case ConnectionType.device_not_found:
        case ConnectionType.disconnected:
          status = DeviceStatus.disconnected;
          _voltageLevel = null;
          _batteryTimer?.cancel();
          _batterySubscription?.cancel();
          break;
      }
    });

    // try to scan for eSense device and connect to it
    manager?.connect();
  } catch (error) {
    warning(
        '$runtimeType - Error connecting to eSense device id: $id - $error');
    return DeviceStatus.error;
  }

  return DeviceStatus.connecting;
}