Battery notification not being received

Battery notification not received

Connect to device, Set notifications for battery level change and custom characteristic
I am using a custom peripheral, which exposes a custom service & characteristic. I am trying to setup notifications on characteristic value changes for both the custom characteristic, and the battery level changes. When using the AOSP API directly, I can set notification for both, and I receive changes on both characteristics as expected. When I use this RxAndroidBle API, I no longer get notifications on the battery level changes. I do get the notification on the custom characteristic, though. I wonder why this is? See code below:

List<BluetoothGattCharacteristic> characteristics = new ArrayList<>();
characteristics.add(mSwitchCharacteristic);             // the custom Characteristic
characteristics.add(mBatteryLevelCharacteristic);   // battery level characteristic

Subscription notificationSubscription = connectionObservable
    .flatMap(rxBleConnection -> setupNotifications(rxBleConnection, characteristics))
    .doOnNext(notificationObservable -> {
        Log.i(TAG,"setupAllNotifications - Notification has been set up");
    })
    .subscribe(
        pair -> {
            Log.i(TAG,"setupAllNotifications - received notifications...");
            UUID uuid    = pair.first.getUuid();
            byte[] bytes = pair.second;
            BluetoothGattCharacteristic characteristic = null;

            if (mSwitchCharacteristic.getUuid().toString().equals(uuid.toString())){
                Log.i(TAG,"setupAllNotifications - received Switch char...");

                characteristic = mSwitchCharacteristic;
            }
            else if (mBatteryLevelCharacteristic.getUuid().toString().equals(uuid.toString())) {
                Log.i(TAG, "setupAllNotifications - received Battery char...");

                characteristic = mBatteryLevelCharacteristic;
            }

            if (characteristic != null) {
                Log.i(TAG,"setupAllNotifications - got characteristics, process..");

                onNotificationReceived(characteristic, bytes);      // just a method that processes the value
            }
            else{
                Log.i(TAG,"setupAllNotifications - failed to get characteristics, ignore.");
            }
        },
        throwable -> {
            Log.iTAG,"setupAllNotifications - throwable: "+throwable.getLocalizedMessage());

            onNotificationSetupFailure(characteristic, throwable);   // just a method that processes the value
        }
);

and the setupNotifications() method is as follows:

private Observable<Pair<BluetoothGattCharacteristic, byte[]>> setupNotifications(RxBleConnection connection,
                                                                                     List<BluetoothGattCharacteristic> characteristics) {
        Helper.getInstance().debug(TAG,"setupNotifications");

        return Observable.from(characteristics) // deal with every characteristic separately
                .filter(characteristic -> (characteristic.getProperties() & BluetoothGattCharacteristic.PROPERTY_NOTIFY) != 0) // filter characteristics that have notify property
                .flatMap(characteristic -> connection
                                .setupNotification(characteristic) // setup notification for each
                                .flatMap(observable -> observable), // to get the raw bytes from notification
                        Pair::new); // merge characteristic with byte[] to keep track from which characteristic the bytes came
    }

Actual result

• Battery level changes are not received in the onNotificationReceived() method.
• Changes to the custom characteristic are received in the onNotificationReceived() method
  

Expected result

• changes to battery level should be received in the onNotificationReceived() method.
• changes to the custom characteristic should be received in the onNotificationReceived() method
  

[dariuszseweryn]

FYI You can close it by yourself next time. 😃

[chuks]

@dariuszseweryn ok --it is working now. It takes a very long time before the battery notifications start coming in. No code changes needed. I think the delay must be from the peripheral side, since the custom starts immediately. Can close this, thanks!