private void initDescriptor(BluetoothGattCharacteristic characteristic, UUID uuid,
                                int instance, int permissions) {
        mCharacteristic = characteristic;
        mUuid = uuid;
        mInstance = instance;
        mPermissions = permissions;
    }
Used for mocks and constants in rxandroidble, but instances created in mockrxandroidble, so the methods must be implemented
rxandroidble/src/test/java/android/bluetooth/BluetoothGattDescriptor.java