Demystifying Android's Bluetooth Low Energy at MCE^3 Conf

Presentation by Paweł Urban & Dariusz Seweryn.

Programming with a hardware in mind is fun. IoT is no longer a future but it's around us and Bluetooth programming became our reality. We'll tell you how to play with it without having a headache, using reactive concepts.

Transcript

2. DEMYSTIFYING 
 ANDROID'S 
 BLUETOOTH LOW ENERGY Paweł Urban Senior Software Engineer Dariusz Seweryn Senior Software Engineer
3. BLUETOOTH LOW ENERGY
4. BLUETOOTH LOW ENERGY ANDROID’S NATIVE SUPPORT
5. BLUETOOTH LOW ENERGY ANDROID’S NATIVE SUPPORT YOUR SECRET WEAPON
6. WHY SHOULD I CARE 
 ABOUT BLE?
8. The Internet of Things – infographic The Connectivist based on Cisco data
10. 2006 2010
11. 2006 2010 2013
12. A DEVELOPER
 PERSPECTIVE
13. Jelly Bean
14. BACKWARD SUPPORT
15. BACKWARD SUPPORT
16. BACKWARD SUPPORT BETA
17. BACKWARD SUPPORT BETA
18. LOW ENERGY
19. GAP (GENERIC ACCESS PROFILE)
20. PERIPHERAL
21. PERIPHERAL CENTRAL
22. PERIPHERAL CENTRAL ADVERTISE PRESENCE
23. PERIPHERAL CENTRAL ADVERTISE PRESENCE CONNECTION HANDSHAKE
24. CLIENT PERIPHERAL CENTRAL ADVERTISE PRESENCE CONNECTION HANDSHAKE SERVER
25. CLIENT PERIPHERAL CENTRAL ADVERTISE PRESENCE CONNECTION HANDSHAKE SERVER READ/WRITE DATA REQ RESPOND WITH DATA
26. GATT (Generic Attribute Profile)
27. Texas Instruments
 SensorTAG
28. Peripheral device Service A Characteristic 1 Characteristic 2 DEVICE
29. Peripheral device DEVICE SENSOR Service A Characteristic 1 Characteristic 2
30. Peripheral device DEVICE SENSOR 36.6°C SENSOR
 VALUE Service A Characteristic 1 Characteristic 2
31. Peripheral device DEVICE SENSOR 36.6°C SENSOR
 VALUE Service A Characteristic 1 Characteristic 2 SENSOR
 CONFIGURATION
32. Peripheral device DEVICE SENSOR 36.6°C SENSOR
 VALUE Service A Characteristic 1 Characteristic 2 SENSOR
 CONFIGURATION READ WRITE NOTIFY
33. Peripheral device Service A Characteristic 1 Characteristic 2 Service B Characteristic 3 Characteristic 4 Service C Characteristic 5 Characteristic 6 DISCOVERY
34. UUID 1 TEMPERATURE(„4E99FFF1-4B3E-11E5-9D65-0002A5D5C51B"); 2 HUMIDITY(„4E99FFF2-4B3E-11E5-9D65-0002A5D5C51B"); 3 TIME(„5E99FFC1-4B3E-11E5-9D65-0002A5D5C51B"); 4 DEVICE_NAME(„00002a26-0000-1000-8000-00805f9b34fb”);
35. UUID 1 TEMPERATURE(„4E99FFF1-4B3E-11E5-9D65-0002A5D5C51B"); 2 HUMIDITY(„4E99FFF2-4B3E-11E5-9D65-0002A5D5C51B"); 3 TIME(„5E99FFC1-4B3E-11E5-9D65-0002A5D5C51B"); 4 DEVICE_NAME(„00002a26-0000-1000-8000-00805f9b34fb”); 128-bit
36. UUID 1 TEMPERATURE(„4E99FFF1-4B3E-11E5-9D65-0002A5D5C51B"); 2 HUMIDITY(„4E99FFF2-4B3E-11E5-9D65-0002A5D5C51B"); 3 TIME(„5E99FFC1-4B3E-11E5-9D65-0002A5D5C51B"); 4 DEVICE_NAME(„00002a26-0000-1000-8000-00805f9b34fb”); 16-bit
37. THE SCARY PART
38. BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); final boolean startLeScan = bluetoothAdapter.startLeScan(leScanCallback); BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) { // processing results } }; bluetoothAdapter.stopLeScan(leScanCallback); SCAN
39. BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); final boolean startLeScan = bluetoothAdapter.startLeScan(leScanCallback); BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) { // processing results } }; bluetoothAdapter.stopLeScan(leScanCallback); SCAN
40. BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); final boolean startLeScan = bluetoothAdapter.startLeScan(leScanCallback); BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) { // processing results } }; bluetoothAdapter.stopLeScan(leScanCallback); SCAN
41. BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); final boolean startLeScan = bluetoothAdapter.startLeScan(leScanCallback); BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) { // processing results } }; bluetoothAdapter.stopLeScan(leScanCallback); SCAN
42. BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); final boolean startLeScan = bluetoothAdapter.startLeScan( new UUID[]{ UUID.fromString(…) }, leScanCallback); BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) { // processing results } }; bluetoothAdapter.stopLeScan(leScanCallback); SCAN
43. BluetoothDevice remoteDevice = bluetoothAdapter.getRemoteDevice(getEnteredMacAddress()); BluetoothGatt bluetoothGatt = remoteDevice.connectGatt(context, false, callback); BluetoothGattCallback callback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (status == BluetoothGatt.GATT_SUCCESS) { if (newState == BluetoothProfile.STATE_CONNECTED) { // You are connected! } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // Disconnected bluetoothGatt.close(); } } else { // Maybe disconnected? onDisconnectRequested(); } } }; CONNECTION
44. BluetoothDevice remoteDevice = bluetoothAdapter.getRemoteDevice(getEnteredMacAddress()); BluetoothGatt bluetoothGatt = remoteDevice.connectGatt(context, false, callback); BluetoothGattCallback callback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (status == BluetoothGatt.GATT_SUCCESS) { if (newState == BluetoothProfile.STATE_CONNECTED) { // You are connected! } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // Disconnected bluetoothGatt.close(); } } else { // Maybe disconnected? onDisconnectRequested(); } } }; CONNECTION
45. BluetoothDevice remoteDevice = bluetoothAdapter.getRemoteDevice(getEnteredMacAddress()); BluetoothGatt bluetoothGatt = remoteDevice.connectGatt(context, false, callback); BluetoothGattCallback callback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (status == BluetoothGatt.GATT_SUCCESS) { if (newState == BluetoothProfile.STATE_CONNECTED) { // You are connected! } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // Disconnected bluetoothGatt.close(); } } else { // Maybe disconnected? onDisconnectRequested(); } } }; CONNECTION
46. BluetoothDevice remoteDevice = bluetoothAdapter.getRemoteDevice(getEnteredMacAddress()); BluetoothGatt bluetoothGatt = remoteDevice.connectGatt(context, false, callback); BluetoothGattCallback callback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (status == BluetoothGatt.GATT_SUCCESS) { if (newState == BluetoothProfile.STATE_CONNECTED) { // You are connected! } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // Disconnected bluetoothGatt.close(); } } else { // Maybe disconnected? onDisconnectRequested(); } } }; CONNECTION
47. BluetoothDevice remoteDevice = bluetoothAdapter.getRemoteDevice(getEnteredMacAddress()); BluetoothGatt bluetoothGatt = remoteDevice.connectGatt(context, false, callback); BluetoothGattCallback callback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { if (status == BluetoothGatt.GATT_SUCCESS) { if (newState == BluetoothProfile.STATE_CONNECTED) { // You are connected! } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // Disconnected bluetoothGatt.close(); } } else { // Maybe disconnected? onDisconnectRequested(); } } }; CONNECTION
48. boolean startedDiscovering = bluetoothGatt.discoverServices(); @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { BluetoothGattService service = gatt.getService(serviceUUID); BluetoothGattCharacteristic characteristic = service.getCharacteristic(characteristicUUID); boolean startedReadOperation = gatt.readCharacteristic(characteristic); // ... } else { // ... } } @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { byte[] characteristicValue = characteristic.getValue(); } else { // ... } } READING DATA
49. boolean startedDiscovering = bluetoothGatt.discoverServices(); @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { BluetoothGattService service = gatt.getService(serviceUUID); BluetoothGattCharacteristic characteristic = service.getCharacteristic(characteristicUUID); boolean startedReadOperation = gatt.readCharacteristic(characteristic); // ... } else { // ... } } @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { byte[] characteristicValue = characteristic.getValue(); } else { // ... } } READING DATA
50. boolean startedDiscovering = bluetoothGatt.discoverServices(); @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { BluetoothGattService service = gatt.getService(serviceUUID); BluetoothGattCharacteristic characteristic = service.getCharacteristic(characteristicUUID); boolean startedReadOperation = gatt.readCharacteristic(characteristic); // ... } else { // ... } } @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { byte[] characteristicValue = characteristic.getValue(); } else { // ... } } READING DATA
51. boolean startedDiscovering = bluetoothGatt.discoverServices(); @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { BluetoothGattService service = gatt.getService(serviceUUID); BluetoothGattCharacteristic characteristic = service.getCharacteristic(characteristicUUID); boolean startedReadOperation = gatt.readCharacteristic(characteristic); // ... } else { // ... } } @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { if (status == BluetoothGatt.GATT_SUCCESS) { byte[] characteristicValue = characteristic.getValue(); } else { // ... } } READING DATA
52. @Override void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) @Override void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) @Override void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) @Override void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) @Override void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) @Override void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) @Override void onServicesDiscovered(BluetoothGatt gatt, int status) @Override void onMtuChanged(BluetoothGatt gatt, int mtu, int status) @Override void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) @Override void onReliableWriteCompleted(BluetoothGatt gatt, int status)
53. DOES IT HAVE TO BE HARD?
54. RxAndroidBLE No! Just use
55. RXJAVA
56. OBSERVABLE RXJAVA
57. Device Scanning OBSERVABLE
58. Device Scanning Scanned device
59. Device Scanning Scanned device
60. Device Scanning Scanned device
61. Device Scanning
62. Device Scanning Establish Connection
63. Device Scanning Connecting to device Establish Connection
64. Device Scanning Connecting to device Establish Connection
65. Read Characteristic Device Scanning Connecting to device Establish Connection
66. Device Scanning Connecting to device Reading Characteristic Value Read Characteristic Establish Connection
67. Device Scanning Connecting to device Reading Characteristic Value Read Characteristic Establish Connection
68. Declaration of what we want to achieve Device Scanning Connecting to device Reading Characteristic Value Read Characteristic Establish Connection
69. Device Scanning Connecting to device Reading Characteristic Value Read Characteristic Establish Connection
70. Device Scanning Connecting to device Some action Do something Establish Connection
71. Device Scanning Connecting to device Some action Do something Establish Connection
72. Device Scanning Connecting to device Some action Do something Establish Connection
73. THE DEMO
74. SAY THAT AGAIN?
75. Q&As?
76. LET’S CHAT! @DSeweryn +PawełUrban https://git.io/vw8PM
77. Thank You! @DSeweryn +PawełUrban https://git.io/vw8PM