Android Gadgets, Bluetooth Low Energy, and the WunderBar
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Presentation held at Droidcon Amsterdam
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Android Gadgets, Bluetooth Low Energy, and the WunderBar
- 1. Android Gadgets, Bluetooth Low Energy, and the
- 2. Gadgets: From Wired... USB peripherals are no good ● No brand-to-brand standard protocols ● Bad hardware, yucky APIs ● No consistent form factor ● Cords are the worst
- 3. ...To Wireless Bluetooth Classic ● AKA: The Reason Your Phone’s Battery Lasts For 2 Hours ● High throughput data streaming ● Wireless audio, video, etc ● Many protocols Bluetooth Smart™ ● AKA: Bluetooth Low Energy ● ...Lower energy ● Low throughput / periodic data transfer ● Sensors, beacons, Internet of Things, etc ● One general protocol
- 4. The BLE Stack GATT L2CAP Link Layer Physical (Single/Dual)
- 5. The GATT Protocol Characteristic Attribute Attribute Heart Rate BPM Transmit Rate
- 6. The GATT Protocol Service Characteristic Attribute Attribute Characteristic Heart Rate Monitoring Heart Rate Location on Body
- 7. Peripheral The GATT Protocol Service Attribute Attribute Characteristic Service Cardiac Health Device Heart Rate Blood Pressure Characteristic
- 8. The GATT Protocol Server Client Peripheral Service Characteristic Characteristic Service Read/Write/Sub Respond/Push Attribute Attribute
- 9. Connecting Slave Master Advertise 1 2 Scan Connect and Subscribe 3 4 Push New Data
- 10. Numbers ● Operates on 2.4 MHz band ○ Same as WiFi, Bluetooth Classic ● No protocol limit on number of connections ○ Only limited by hardware / software stack
- 11. Examples
- 12. How do I make cool things with BLE?
- 13. Your starter kit for the Internet of Things!
- 14. Hardware
- 15. Look: No Hands! Sensor Data BLE Android Device Master Module relayr Cloud
- 17. CODE (finally)! InsulinAngel Code and BLE best practices
- 19. BLE is… Temperamental ● Issues reconnecting to device ○ Solution: reset the stack if a problem ● Different device-to-device quality ○ Solution: thorough testing / set user expectations
- 20. Security ● Data transfer is encrypted / jumps channels ● Initial connection packets are UNENCRYPTED ● Take great care with sensitive data
- 21. Contact Peter Dwersteg peter@relayr.io @relayr_cloud GATT Protocol: http://bit.ly/1yW8Bn3 Security Concerns: http://bitly.com/1sycM4G