Can't see the bluetooth deviceClass

[SteNafH]

I am making a Bluetooth Chat Application in React Native. Everything is working as expected, I can communicate between devices, read data and write data etc.

But now I want to acces the Bluetooth deviceclass, this property is always returning undefined for me. And I do not know why.

I think it has something to do with the 'android.permission.BLUETOOTH_CONNECT'. Because when I created an Android project trying to get the deviceclass everything worked fine.

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        BluetoothManager bluetoothManager = getSystemService(BluetoothManager.class);
        BluetoothAdapter bluetoothAdapter = bluetoothManager.getAdapter();
        if (bluetoothAdapter == null) {
            System.out.println("Device does not support bluetooth");
            return;
        }

        if (!bluetoothAdapter.isEnabled()) {
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, 123);
        }

        Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();

        if (pairedDevices.size() > 0) {
            // There are paired devices. Get the name and address of each paired device.
            for (BluetoothDevice device : pairedDevices) {
                System.out.println(device.getBluetoothClass());
                System.out.println(device.getBluetoothClass().getDeviceClass());
                System.out.println(device.getBluetoothClass().getMajorDeviceClass());
            }
        }

    }
}

This code worked as expected but needs the 'android.permission.BLUETOOTH_CONNECT' permission in the AndroidManifest.xml

So I check if the permission was granted in my React Native project using the following code.

PermissionsAndroid.check(PermissionsAndroid.PERMISSIONS.BLUETOOTH_CONNECT)
            .then(response => {
                console.log(response);
            });

Which returns false, meaning that is does not have the permission. So I assume it has something to do with this 'android.permission.BLUETOOTH_CONNECT' permission.

But when I try to add this permission to my React Native project nothing seems to change. Even after rebuilding the app.

Can someone help me with this problem?

[kenjdavidson]

Can you debug the android side and see if it's actually getting set? Device class is a hold over from the original library, not sure if it's ever worked.

Not sure if I'll be able to do it soon. But I'll try to get to it if you can't.

[SteNafH]

I would love to debug the android side, but honestly I dont really know how. I have tried setting Logs in the classes but I cant find the logs back in the console. Do you have an instruction, so that I can try myself. Or a short explanation.

[SteNafH]

I have found the issue, in the NativeDevice class in the method map() this was done.

@Override
    public WritableMap map() {
        WritableMap mapped = Arguments.createMap();

        mapped.putString("name", mDevice.getName() != null ? mDevice.getName() : mDevice.getAddress());
        mapped.putString("address", mDevice.getAddress());
        mapped.putString("id", mDevice.getAddress());
        mapped.putBoolean("bonded", mDevice.getBondState() == BluetoothDevice.BOND_BONDED);

        if (mDevice.getBluetoothClass() != null) {
            WritableMap deviceClass = Arguments.createMap();
            deviceClass.putInt("deviceClass", mDevice.getBluetoothClass().getDeviceClass());
            deviceClass.putInt("majorClass", mDevice.getBluetoothClass().getMajorDeviceClass());

            mapped.putMap("deviceClass", deviceClass);
        }

        mapped.putMap("extra", Arguments.makeNativeMap(mExtra));

        return mapped;
    }

As you can see the WritableMap deviceClass was being created and filled but not put in the mapped object. So the method should actualy be:

@Override
    public WritableMap map() {
        WritableMap mapped = Arguments.createMap();

        mapped.putString("name", mDevice.getName() != null ? mDevice.getName() : mDevice.getAddress());
        mapped.putString("address", mDevice.getAddress());
        mapped.putString("id", mDevice.getAddress());
        mapped.putBoolean("bonded", mDevice.getBondState() == BluetoothDevice.BOND_BONDED);

        if (mDevice.getBluetoothClass() != null) {
            WritableMap deviceClass = Arguments.createMap();
            deviceClass.putInt("deviceClass", mDevice.getBluetoothClass().getDeviceClass());
            deviceClass.putInt("majorClass", mDevice.getBluetoothClass().getMajorDeviceClass());

            mapped.putMap("deviceClass", deviceClass);
        }

        mapped.putMap("extra", Arguments.makeNativeMap(mExtra));

        return mapped;
    }

[kenjdavidson]

Nice. Want to submit a pr? I'll release it when you do.

[SteNafH]

I believe I created a Pull Request. It is the first time I have done that. So hopefully everything went correctly!

[kenjdavidson]

Released. Thanks.