在物聯網跟穿戴式裝置正夯的時代,身為App Developer不能不了解的BLE

3. 在穿戴式裝置與物聯網正夯的時代
身為App Developer你不能不了解的BLE
Sam Lee (misgod.tw@gmail.com)

5. lInternet

6. lBLE (Bluetooth Low Energy)
lBluetooth Smart
lBluetooth 4.0 (June 2010)
lBluetooth 4.1 (Dec 2013)
l低成本 (?)
l範圍: ~ 100m
l省電: 鈕扣電池可以撐1年以上
l速度: 理論上限(1Mbit/s), App (270Kbit/s)

7. Overview
lBroadcast & connection
lShort packets
lClient/Server 架構
lEverything has STATE
l非同步傳送資料

8. Device Classic Bluetooth BLE support
Pre-4.0 Bluetooth Yes No
4.x Single-Mode No Yes
4.x Dual-Mode Yes Yes

9. 廣播

10. 連線

11. 如何省電

13. Protocol ??
Profile ??
lGATT Based Profiles

14. l2.4G Hz
l40 channels
l3 advertising channel
lFixed rate: 1 Mbit/s
l高斯頻移鍵控(GFSK)
lFrequency Hopping (AFH)

16. lBluetooth Device Address
l48-bit (Public/Random)
l4 roles
lAdvertiser & Scanner
lMaster & Slave
l1 format 2 types packets
lAdvertising & Data
lConnection (7.5ms~4s)
l 27bytes, but ~20 bytes
lAdvertising (20ms ~ 10.24s)
l31 bytes data payload
lActive/Passive scanning

17. l搭起友誼的橋樑

18. l協定多工器
l封包重組與分配
lData payload: 23 bytes
lSimilar to TCP

19. lInitiator → Responder
lCentral → Peripheral (GAP)
lSecurity Procedures
lPairing
lBonding
lEncryption Re-establishment
lPairing Algorithms
lJust Works
lPasskey Display
lOut Of Band

20. lClient->Server
lRequest → Response
lStrict Sequencing
lServer Initiated
lIndication/Confirmation
lNotfiication
l Handle lType
l(UUID)
lAttribute Value l
Permissio
ns
l2B 2/4/16B l0~512B

21. lControl layer
lRoles
lBroascaster & Observer
lCentral & Peripheral
lGAP Service(GATT)
lDevice name
lApprearance
lPPCP

22. lData Layer
lRoles
lClient & Server
lBluetoothBaseUUID
lxxxxxxxx-0000-1000-8000-
00805F9B34FB
lShortened UUID(16 or 32 bit)

25. lFirst Release
lJellyBean MR 4.3 (API 18)
lPeripheral Mode
lAndroid L (Coming Soon)

26. http://developer.android.com/guide/topics/connectivity/bluetooth-

27. 搭配: TI SensorTag CC2541
l 兩顆按鈕
l 陀螺儀
l 加速計
l 溫濕感測
l 氣壓計
l 磁力計
l IR溫度感測器

28. Coding Steps
1. Use BLE Permissions
2. Setup BLE
3. Scan LE device
4. Connect to GATT Server
5. Discovery Services
6. Read Data
l Read Characteristic(Attrubutes)
l Receiving notification

29. 簡易型簡報器

30. 實際的應用案例

31. http://shopping.pchome.com.tw/prod/CBAFJ0-

32. http://24h.pchome.com.tw/prod/DGBT4W-

33. Oral-B

34. August Smart Lock
http://www.august.com/

35. iBeacon

36. Zuli
https://www.kickstarter.com/projects/zuli/zuli-smartplugs

37. https://www.youtube.com/watch?v=g8h_i8qv1FY

38. Mimo Kimono
http://mimobaby.com/