Building iOS apps using "Bluetooth Low Energy"
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I gave this talk in Jerusalem, Israel, and Palestine in 2016 with following schedule: - July 25, 2016 Azrieli College, Jerusalem - July 26, 2016 Google Campus - Tel Aviv, Israel - July 27, 2016 SigmaLabs - Tel Aviv, Israel - July 28, 2016 Birzeit University - Palestine These events were hosted by Embassy of Japan in Israel. [Description] While introducing Japanese technologies (products) such as WHILL, Moff, BONX, and etc. which Mr. Tsutsumi was involved in inventing the applications, he will talk about how BLE, a key technology of IoT, is utilized in those products.
Building iOS apps using "Bluetooth Low Energy"
- 1. Building iOS apps using "Bluetooth Low Energy" Shuichi Tsutsumi @shu223 July 25, 2016 Azrieli College, Jerusalem July 26, 2016 Google Campus - Tel Aviv, Israel July 27, 2016 SigmaLabs - Tel Aviv, Israel July 28, 2016 Birzeit University - Palestine
- 4. Overview ? Basics of BLE ? Practical Tips to build apps using BLE with Japanse Products
- 6. Bluetooth Low Energy (BLE) ? Wireless technology - no network infrastructure required Wi-FiBLE
- 7. ? Low energy ? NOT compatible with Classic BT ? Uses 2.4 GHz radio frequencies ? Marketed by the Bluetooth SIG ? etc…
- 8. The most important thing (for iOS developers)
- 9. The iOS API ‘Core Bluetooth’ is open for developers ? API for Classic BT is NOT open. - Requires MFi certification.
- 10. BLE is almost the ONLY way to enable iOS apps to communicate with external hardware without infrastructure or MFi.
- 11. konashi moff band sensortag External HW ? Simple → Small, Low cost & Long life Smart Phone ? High Performance ? Internet Connection ? Easy to program ? etc… Communicate with BLE
- 12. Basics of BLE
- 14. (Demo)
- 15. Moff Band Moff App Sensor Data BLE Connection Sensors - Gyroscope - Accelerometer Analyze sensor data Recognize - Gesture - Posture Play sounds
- 16. Sensor Data BLE Connection How is sensor data sent to the app?
- 17. Scan Step 1. Scan Advertise : Search for nearby BLE devices centralManager.scanForPeripheralsWithServices(nil, options: nil) Peripheral Central
- 18. Connect Step 2. Connect centralManager.connectPeripheral(peripheral, options: nil)
- 19. Moff Service xx Service Button Characteristic xx Characteristic Sensor Characteristic Subscribe (Request to be notified) Step 3. Subscribe: Ready to receive data GATT = Generic Attribute Profile peripheral.setNotifyValue(true, forCharacteristic: c)
- 20. Step 4. Notify Notify subscribers Moff Service Sensor Characteristic xxxx Characteristic Update the value func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError?) { print(“Received sensor data!”) }
- 21. Hardware Side? I’m sorry, I don’t know…
- 22. BLE Firmware Engineer iOS Engineer
- 33. Group conversation system with VoIP - Detects the human voice - Cuts out all background noise → Can be used even in areas with poor coverage!
- 34. BLE for BONX
- 35. IoT for Cars ‘厂尘补谤迟顿谤颈惫别’
- 36. Printable Open-Source Humanoid “笔尝贰狈2”
- 37. Music for the Deaf Daito Manabe/Motoi Ishibashi/Teruoka Masaki/Shuichi Tsutsumi x SOUL FAMILY
- 38. Music for the Deaf Daito Manabe/Motoi Ishibashi/Teruoka Masaki/Shuichi Tsutsumi x SOUL FAMILY Commands Electronic Stimulation DeviceiPhone
- 40. Practical Tips to build apps using BLE
- 41. Defining GATT
- 42. GATT to send sensor data Foo Service Sensor Data Characteristic UUID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx Bar Service xx Characteristic UUID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx Properties: Notify Value: acc x, acc y, acc z, gyro x, gyro y, gyro z (2bytes for each) xx Characteristic
- 43. GATT to send button interactions Foo Service Button Control Characteristic UUID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx UUID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx Properties: Notify Value: 0x01 or 0x00 Button interactions 0x01: Pushed 0x00: Released
- 44. GATT for remote control Foo Service Remote Control Characteristic UUID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx UUID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx Properties: Write Value: Horizontal (-100 ~ 100), Vertical (-100 ~ 100) values
- 45. How to define GATT 1. Create UUID for the service & characteristic 2. Define the properties (Read, Notify, Write, etc.) Peripheral → Central: Notify ? Central → Peripheral: Write 3. Define the value format Usually limited to 20 bytes $ uuidgen CEEA31BC-BEAC-4A78-B7ED-FC96B6254D4C
- 46. Reference: GATT profiles by Bluetooth SIG
- 48. Background behaviors on iOS ? Very limited - Listening to music - Getting location data - Downloading data
- 49. Imagine
- 50. If BLE didn’t work in the background…
- 51. You would have to always keep the app in the foreground, while snowboarding!
- 52. You would have to launch the app whenever you go driving!
- 53. What functions can be used in the background in iOS? ? Scanning peripherals ? Connecting with peripherals ? Reading characteristics’ value ? Writing characteristics’ value ? Receiving notifications Almost all functions can be used even in the background!
- 54. Limitations ? Longer intervals for scanning ? Must explicitly specify one or more services to scan ? CBCentralManagerOptionShowPowerAlertKey option is ignored Resources - Core Bluetooth Programming Guide - Core Bluetooth Framework Reference (also in headers)
- 55. If the app in the background is killed by the system…
- 57. State Preservation and Restoration The system takes over the BLE tasks even after the app is killed. - Preserves the state of the app’s central managers and continues the BLE tasks on their behalf. - Relaunches the app into the background and calls the corresponding callback method. → The app can handle BLE events!
- 58. func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError?) { print(“Received the characteristic data!”) } ? The app is killed by the system ? The user pushes the button on the peripheral device ? The system receives the notification ? The app is relaunched in the BG and the delegate method is called. The app can process the button interaction!
- 59. How to test without HW prototypes
- 60. Did the HW prototypes exist when develop the apps? Projects HW prototypes existed? Moff YES WHILL NO BONX NO SmartDrive YES PLEN2 NO Music for the Deaf NO
- 61. Development Kit Can start development without creating a circuit ourselves BLE Module Display USB interface Battery box
- 62. Horizontal (-100~100) / Vertical (-100~100) Development Kit App BLE
- 64. Emulator App ? Develop another iOS app as the alternative to the peripheral device ? Easier for iOS engineers
- 65. Multi-Function Control ? Single Tap ? Double Tap ? Long Press ? Very Long Press =
- 66. App Review
- 67. Costing too much MSRP $13,995 Not enough devices when submitting
- 68. Videos for review ? Show how the app works with the peripheral device ? Not need to be cool!
- 69. ? Shoot with iPhone ? Edit with iMovie
- 70. Recap ? What is Bluetooth Low Energy? ? Basics of BLE with ‘Moff’. ? Japanese Hardware Products I’ve worked on ? Practical Tips to build apps using BLE - Defining GATT - Defining background behaviors - Testing without HW prototypes - App Review
- 71. Thank you! Shuichi Tsutsumi - iOS Freelancer ? Twitter: @shu223 ? GitHub: shu223 ? Email: shuichi0526@gmail.com