Merge "BluetoothMidiDevice: change write type to support JamStik"

            // switch to receiving notifications after initial characteristic read

            mBluetoothGatt.setCharacteristicNotification(characteristic, true);

            // Use writeType that requests acknowledgement.

            // This improves compatibility with various BLE-MIDI devices.

            int originalWriteType = characteristic.getWriteType();

            characteristic.setWriteType(BluetoothGattCharacteristic.WRITE_TYPE_DEFAULT);

            BluetoothGattDescriptor descriptor = characteristic.getDescriptor(

                    CLIENT_CHARACTERISTIC_CONFIG);

            if (descriptor != null) {

                descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);

                mBluetoothGatt.writeDescriptor(descriptor);

                boolean result = mBluetoothGatt.writeDescriptor(descriptor);

                Log.d(TAG, "writeDescriptor returned " + result);

            } else {

                Log.e(TAG, "No CLIENT_CHARACTERISTIC_CONFIG for device " + mBluetoothDevice);

            }

            characteristic.setWriteType(originalWriteType);

        }

        @Override