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public class MyGattCallback extends BluetoothGattCallback {

    public MyGattCallback() {
    }

    /**
     * Call whenever BluetoothGatt changes it's state
     *
     * @param gatt     mGatt object
     * @param status   current status of Gatt
     * @param newState new stata of Gatt
     */
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            EventBus.getDefault().post(new Events.DeviceConnectedEvent());
            EventBus.getDefault().post(new Events.StateConnectedEvent(gatt));
        } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
            EventBus.getDefault().post(new Events.DeviceDisconnectedEvent());
        }
    }

    /**
     * calls after new service discovered in GATT
     *
     * @param gatt   mGatt object
     * @param status current status
     */
    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        EventBus.getDefault().post(new Events.ServicesDiscoveredEvent(gatt));
    }

    /**
     * calls when write to gatt failed
     *
     * @param gatt           mGatt object
     * @param characteristic characteristic that failed
     * @param status         current status
     */
    @Override
    public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        super.onCharacteristicWrite(gatt, characteristic, status);
        if (status != 0) {
            EventBus.getDefault().post(new Events.GattWriteFailedEvent(gatt));
        }
    }

    /**
     * calls whenever wired to notification GATT service's characteristics
     * changed it's own state
     *
     * @param gatt           mGatt object
     * @param characteristic changed characteristics object
     */
    @Override
    public void onCharacteristicChanged(BluetoothGatt gatt,
                                        BluetoothGattCharacteristic c) {
        EventBus.getDefault().post(new Events.CharacteristicChangedEvent(c));
    }

}