Bluetooth LE - #inspect 2013 - Brussels, Belgium - 28 March 2013

This was from my talk at the RubyMotion #inspect 2013 conference on using Bluetooth LE from RubyMotion. It was a wonderful conference organized by HipByte and there was amazing beer!

Transcript

1. Bluetooth LE Sensing the Real World with RubyMotion Rich Kilmer @rich_kilmer Hell Yes! +
2. Bluetooth History 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 SIG Form ed Bluetooth 1.0 Headset, U SB Laptop/M ouse G PS, Cam era Bluetooth 1.2 Bluetooth 2.0 4k SIG M em bers 1B Devices TV/Radio 2B Devices Bluetooth 3.0 Bluetooth 4.0 M acM ini/A ir iPhone 5/iPad M ini 18k SIG M em bers 1mb/s 3mb/s 54mb/s ~260kb/s Our focus
3. www.sticknfind.com
4. Client Device Support
5. Client Server iPhone Sensor
6. Broadcaster Ad Ad Ad Ad Ad Scanning Observer (iPhone) (Sensor) advertising interval Advertising 3 advertisements per second powered off: 99.9999%
7. Peripheral connect communications interval Central (iPhone) (Sensor) accept read respond Communications
8. Peripheral Peripheral Service Temperature Characteristic Current temp Characteristic Battery level has many has many
9. CoreBluetooth CBCentralManager CBPeripheral CBPeripheralManager CBCentral CBService CBCharacteristic CBMutableService CBMutableCharacteristic CBUUID CBATTRequest main data helper
10. Rakefile app.frameworks << 'CoreBluetooth'
11. #instantiate CBCentralManager @manager = CBCentralManager.alloc.initWithDelegate self, queue: nil
12. #wait for CBCentralManager to be powered on and ready def centralManagerDidUpdateState(manager) if manager.state == CBCentralManagerStatePoweredOn # do something now! end end
13. #scan for peripherals options = { CBCentralManagerScanOptionAllowDuplicatesKey => true } services = nil # services = [ServiceUUID1, ServiceUUID2] @manager.scanForPeripheralsWithServices services, options:options
14. #peripheral discovery delegate method def centralManager(manager, didDiscoverPeripheral: peripheral, # CBPeripheral advertisementData: data, # Hash RSSI: rssi #Signal strength...distance ) #do something with the discovered peripheral #NOTE: peripheral name/uuid may or may not be set... end
15. #connect to peripheral manager.stopScan @peripheral = peripheral #prevent GC! manager.connectPeripheral(peripheral, options:{ CBConnectPeripheralOptionNotifyOnConnectionKey: true, CBConnectPeripheralOptionNotifyOnDisconnectionKey: true, CBConnectPeripheralOptionNotifyOnNotificationKey: false })
16. #connected peripheral def centralManager(central_manager, didConnectPeripheral:peripheral) #peripheral.name and peripheral.UUID ARE set end def centralManager(central_manager, didFailToConnectPeripheral:peripheral, error:error) #could not connect to peripheral (toggle BT in Sim?) end
17. #connected peripheral now discover services! peripheral.delegate = self peripheral.discoverServices(nil) #all service UUIDs
18. #discovered services now discover characteristics def peripheral(peripheral, didDiscoverServices:error) return if error || !peripheral.services peripheral.services.each do |service| # if service.UUID == CBUUID.UUIDWithString("XXXX") # do something specific # end peripheral.discoverCharacteristics nil, forService:service end end
19. #discovered characteristics, now read them def peripheral(peripheral, didDiscoverCharacteristicsForService:service, error:error) return if error || !service.characteristics service.characteristics.each do |char| if char.UUID == CBUUID.UUIDWithString("XXXX") peripheral.readValueForCharacteristic char end if char.UUID == CBUUID.UUIDWithString("YYYY") peripheral.setNotifyValue(true, forCharacteristic:char) end end end
20. #retrieved values def def peripheral(peripheral, didUpdateValueForCharacteristic:char, error:error) return if error if char.UUID == CBUUID.UUIDWithString("XXXX") #do something char.value.bytes... end end
21. #write values value = Pointer.new(:uchar) value[0] = 32 data = NSData.dataWithBytes(value[0], length:8) peripheral.writeValue data, forCharacteristic:char, type:CBCharacteristicWriteWithResponse
22. Bluetooth Demo Variable Technologies Node Platform
23. sudo nvram bluetoothHostControllerSwitchBehavior="never" Simulator + BT LE
24. Thank you! Props to Ruben Fonseca (rubenfonseca) for BT LE Example! +