unable to connect metawear C with some Android mobiles

Comments

• Eric

  May 2018

  You'll need to provide more information:

  • What is the model and OS of the Android devices that can connect with the boards?

    • What about the devices that can't connect?

  • What code are you running on the boards once they are connected?

  • Are you using fresh batteries?
  • Are the boards running the latest firmware (v1.3.6 at the time of this post)?
  • Can you scan and connect to the devices when using another BLE app, such as the nRF Connect app?
• acalvetc

  May 2018

  i collect this information and send you again. thank you
• acalvetc

  May 2018

  Hi,
  model Android devices and OS:
  Samsung Galaxy J3 (2016) SM-J320F, Android V5
  Galaxy s5 neo, Android V6.0
  Wolder Wian 65 Android V5.1.1 or 6
  Batteries ok
  Metawear update firmaware v.1.3.6
  nRF connect it found Metawear

  Code running when are connected
  public Task actuallyConnectMetawear()
  {
  updateSensorStatus(SensorStatus.CONNECTING);

     connectionAttempts++;
  
     return board.connectAsync().continueWithTask(new Continuation<Void, Task<Void>>() {
    @Override
    public Task<Void> then(Task<Void> task) throws Exception {
       if (task.isFaulted()) {
          Log.i("WalkAtWork", "Failed:"+task.getError());
       } else {
          Log.i("WalkAtWork", "Connected");
                 connectionAttempts = 0;
          startMetawearStreaming();
       }
       if(connectionAttempts < 10) {
                 return task.isFaulted() || task.isCancelled() ? actuallyConnectMetawear() : task;
             }
             else{
                 connectionAttempts = 0;
          discoverBluetooth();
          return null;
             }
    }
  

  });
  }

  thank you
• Eric

  May 2018

  • Which one of those devices fails to connect / discover the board?
  • What does startMetawearStreaming do?
  • Are you resetting the boards before stopping the app?
• acalvetc

  June 2018

  1. all of this devices fails connect / discover the board. All

  2. code startMetamwearStreaming:
     **_public void startMetawearStreaming()
     {
     board.readDeviceInformationAsync()
     .continueWith(new Continuation<DeviceInformation, Void>() {
     @Override
     public Void then(Task task) throws Exception {
     Log.i("WalkAtWork", "Device Information: " + task.getResult());
     updateSensorStatus(SensorStatus.CONNECTED);
     return null;
     }
     });

     accBmi160 = board.getModule(AccelerometerBmi160.class);

     accBmi160.stepDetector().configure()
     .mode(AccelerometerBmi160.StepDetectorMode.SENSITIVE)
     .commit();

     accBmi160.stepDetector().addRouteAsync(new RouteBuilder() {
     @Override
     public void configure(RouteComponent source) {
     source.stream(new Subscriber() {
     @Override
     public void apply(Data data, Object... env) {
     if(status==Status.WALK || status==Status.STAND){
     status = Status.WALK;
     sitCounter = 0;
     standCounter = 0;
     Log.i("WalkAtWork", "Walking");
     }
     }
     });
     }
     }).continueWith(new Continuation<Route, Void>() {
     @Override
     public Void then(Task task) throws Exception {
     accBmi160.stepDetector().start();
     accBmi160.start();
     return null;
     }
     });

     accelerometer= board.getModule(Accelerometer.class);
     accelerometer.configure()
     .odr(12.5f) // Set sampling frequency to 25Hz, or closest valid ODR
     .range(4f) // Set data range to +/-4g, or closet valid range
     .commit();
     accelerometer.acceleration().addRouteAsync(new RouteBuilder() {
     @Override
     public void configure(RouteComponent source) {
     source.stream(new Subscriber() {
     @Override
     public void apply(Data data, Object... env) {

            connectionTimeout.set(0);
     
            float x = data.value(Acceleration.class).x();
            float y = data.value(Acceleration.class).y();
            float z = data.value(Acceleration.class).z();
     
            double modulo = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2) + Math.pow(z, 2));
            if(Math.abs(z) > 0.8) {
               sitCounter++;
               if(sitCounter > 25){
                  status = Status.SIT;
                  standCounter = 0;
               }
            }else{
               standCounter++;
               if(standCounter > 25){
                  status = Status.STAND;
                  sitCounter = 0;
               }
            }
         }
      });
     

     }
     }).continueWith(new Continuation<Route, Void>() {
     @Override
     public Void then(Task task) throws Exception {
     accelerometer.acceleration().start();
     accelerometer.start();
     return null;
     }
     });
     }

  3. metawear was reset before connect.

  4. nrf launch this error: 133 error while connecting

  thk
• Eric

  June 2018

  If all of these devices also fail to connect when using the nRF Connect app, then you'll want to test on another platform, like iOS or Windows 10. It could be the devices you are using have poorly implemented Bluetooth stacks so you should see if the boards work fine on other platforms.