Promisified BLE Client

Introduce Bletia: Promisified BLE Client for Android
potatotips #21 http://connpass.com/event/18732/
Bletia https://github.com/izumin5210/Bletia

Transcript

1. Promisified BLE Client
   Masayuki IZUMI - @izumin5210
   potatotips #21
   https://www.flickr.com/photos/dewittkower/4641701143/
   

   View Slide

2.  Rekimoto Lab. at the University of Tokyo
   (2008-2015: Akashi-NCT)
    Enginner at Wantedly, Inc.
   (2014.9-2015.2: Dmetlabel, Inc.)
   2
   

   View Slide

3. 2
   Ruby
   JavaScript
   Android
   Design
   pry(main) > izumin.skill_ratio
   

   View Slide

4. http://konashi.ux-xu.com/
   https://github.com/YUKAI/konashi-android-sdk/
   https://www.flickr.com/photos/36571434@N03/8524872002
   

   View Slide

5. ＼ 前回のラブライブ！ ／
   kyobashi.dex
   

   View Slide

6. https://speakerdeck.com/izumin5210/tsurai-ble-on-android
   

   View Slide

7. Bluetooth GATT
   GATT Server
   Service
   Service
   

   View Slide

8. Bluetooth GATT
   GATT Server
   Service
   Service
   Characteristic
   

   View Slide

9. BLE on Android
   Central
   wants data
   Peripheral
   has data
   

   View Slide

10. BLE on Android
    Central
    wants data
    Peripheral
    has data
    write value
    read value
    

    View Slide

11. Write characteristic value
    Central
    wants data
    Peripheral
    has data
    write value
    

    View Slide

12. Write characteristic value
    Central
    wants data
    Peripheral
    has data
    write value
    BluetoothGatt#writeCharacteristic()
    

    View Slide

13. Write characteristic value
    Central
    wants data
    Peripheral
    has data
    write value
    BluetoothGatt#writeCharacteristic()
    (async)
    

    View Slide

14. Write characteristic value
    Central
    wants data
    Peripheral
    has data
    write value
    BluetoothGatt#writeCharacteristic()
    BluetoothGattCallback#onCharacteristicWrite()
    (async)
    

    View Slide

15. When is the callback registered ?
    public BluetoothGatt connectGatt (
    Context context,
    boolean autoConnect,
    BluetoothGattCallback callback
    )
    

    View Slide

16. When is the callback registered ?
    public BluetoothGatt connectGatt (
    Context context,
    boolean autoConnect,
    BluetoothGattCallback callback
    )
    We can register only 1 instance...
    

    View Slide

17. Handle callback
    public void onCharacteristicWrite (
    BluetoothGatt gatt,
    BluetoothGattCharacteristic characteristic,
    int status) {
    if (status == BluetoothGatt.GATT_SUCCESS) {
    // check characteristic instance, handling...
    } else {
    // error handling...
    }
    }
    

    View Slide

18. Handle callback
    public void onCharacteristicWrite (
    BluetoothGatt gatt,
    BluetoothGattCharacteristic characteristic,
    int status) {
    if (status == BluetoothGatt.GATT_SUCCESS) {
    // check characteristic instance, handling...
    } else {
    // error handling...
    }
    }
    

    View Slide

19. if BG has promise like api ...
    gatt.writeCharacteristic(characteristic)
    .then(
    // call when the operation successfully
    )
    .fail(
    // call when the operation failure
    )
    

    View Slide

20. Bletia
    https://github.com/izumin5210/Bletia
    

    View Slide

21. Download
    dependencies {
    compile 'info.izumin.android:bletia:1.2.2'
    }
    

    View Slide

22. Instantiate / Connect
    // Pass application context to constructor.
    Bletia bletia = new Bletia(context);
    // BluetoothDevice device
    bletia.connect(device);
    

    View Slide

23. Instantiate / Connect
    bletia.writeCharacteristic(characteristic);
    

    View Slide

24. Write characteristic
    bletia.writeCharacteristic(characteristic)
    .then(new DoneCallback() {
    @Override
    public void onDone(BluetoothGattCharacteristic result) {
    // Call when the request was successfully.
    }
    });
    

    View Slide

25. Write characteristic
    bletia.writeCharacteristic(characteristic)
    .then(new DoneCallback() {
    @Override
    public void onDone(BluetoothGattCharacteristic result) {
    // Call when the request was successfully.
    }
    });
    

    View Slide

26. Write characteristic
    bletia.writeCharacteristic(characteristic)
    .then(new DoneCallback() {
    @Override
    public void onDone(BluetoothGattCharacteristic result) {
    // Call when the request was successfully.
    }
    });
    

    View Slide

27. Write characteristic
    bletia.writeCharacteristic(characteristic)
    .fail(new FailCallback() {
    @OVerride
    public void onFail(BletiaException result) {
    // Call when the request was failure.
    }
    });
    

    View Slide

28. Write characteristic
    bletia.writeCharacteristic(characteristic)
    .fail(new FailCallback() {
    @OVerride
    public void onFail(BletiaException result) {
    // Call when the request was failure.
    }
    });
    

    View Slide

29. Write characteristic
    bletia.writeCharacteristic(characteristic)
    .fail(new FailCallback() {
    @OVerride
    public void onFail(BletiaException result) {
    // Call when the request was failure.
    }
    });
    

    View Slide

30. Support promisified operations (v1.2.2)
    * readCharacteristic() / writeCharacteristic()
    * readDescriptor() / writeDescriptor()
    * enableNotification()
    * readRemoteRssi()
    

    View Slide

31. Conclusion
    Saiko no Experiense
    with
    Promise
    

    View Slide