Unable to read Sensor info from Thingy 52

[manju23reddy]

Hello Team,

I have developed a sample Android application to use and control Nordic Thingy 52. I am able to control LED (Constant, Blink, Intensity). But I am not getting notifications about sensor info. Using the TX I am writing following into Bridge :

byte[] sensor_info = {0x00, 0x01, 0x02};
mWriteCharacteristic.setValue(sensor_info);
mBTGattInst.writeCharacteristic(mWriteCharacteristic);

before writing this command, in my onServicesDiscovered I am enabling notifications for TX as :

mBleUARTService = mBTGattInst.getService(UUID_UART);
            if (mBleUARTService == null) {
                Log.e("onServicesDiscovered", CHARACTERISTIC_RX.toString() + " is not supported");
                return;
            } else {
                mReadCharacteristic = mBleUARTService.getCharacteristic(CHARACTERISTIC_RX);
                mWriteCharacteristic = mBleUARTService.getCharacteristic(CHARACTERISTIC_TX);
            }


            mBTGattInst.setCharacteristicNotification(mWriteCharacteristic, true);

my project is available in Git : github.com/.../Thingy52AndroidApp

[MartinBL]

Hi,

If I'm not mistaken, setCharacteristicNotification() doesn't actually enable notifications on your peripheral. You need to write to the CCCD descriptor too. See this: Receiving GATT Notifications or this: stackoverflow.com/.../android-ble-notification-method-setcharacteristicnotification-is-enough

[manju23reddy]

Hey MartinBL

I am now writing CCCD to RX Descriptor but still not getting the Sensor Reading Notification from TX. Please find the code

mBleUARTService = mBTGattInst.getService(UUID_UART);
            Log.d("UUIDS from UART", mBleUARTService.getCharacteristics().toString());

            if (mBleUARTService == null) {
                Log.e("onServicesDiscovered", CHARACTERISTIC_RX.toString() + " is not supported");
                return;
            } else {
                mReadCharacteristic = mBleUARTService.getCharacteristic(CHARACTERISTIC_RX);
                mWriteCharacteristic = mBleUARTService.getCharacteristic(CHARACTERISTIC_TX);
            }


            mBTGattInst.setCharacteristicNotification(mWriteCharacteristic, true);
            mBTGattInst.setCharacteristicNotification(mReadCharacteristic, true);

            BluetoothGattDescriptor desc = mReadCharacteristic.getDescriptor(UUID.fromString(CLIENT_CHARACTERISTIC_CONFIG));
            if (null != desc){
                desc.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
                mBTGattInst.writeDescriptor(desc);
            }

[MartinBL]

Are you able to debug your code on the Thingy? Would it be possible to set a couple of breakpoints in the code so you check that the notifications are actually being enabled and transmitted?

Alternatively you can check the same with a sniffer log: nRF Bluetooth Sniffer.