Fun with Bluetooth @ DomoticaGrunn

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fun with bluetooth

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bluetooth sucks

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classic bluetooth the reason everybody   hates bluetooth bluetooth low energy vs. control drones and other cool shit

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bluetooth low energy also known as BLE Bluetooth LE Bluetooth Smart Bluetooth 4

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playbulb sphere playbulb

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spherio bb-8

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parrot mini drone

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activity tracker

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the boring theoretical stuff

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central peripheral

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central

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generic attribute proﬁle gatt, because gap was already taken

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central peripheral client server

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§ i device information light multiple services per device

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i device information battery ﬂight control

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i device information battery steering control

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i device information battery heart rate

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heart rate i device information battery

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i device information battery heart rate

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i device information manufacturer model number serial number hardware revision ﬁrmware revision software revision ... multiple characteristics   per service

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server service characteristic value array of objects object property value

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services and characteristics are identiﬁed by uuid’s 16 bit or 128 bit

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0x180A 0000180A-0000-1000-8000-00805F9B34FB 16 bit 128 bit i device information

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0x180F 0000180F-0000-1000-8000-00805F9B34FB 16 bit 128 bit battery

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not recommended any UUID outside of the range  xxxxxxxx-0000-1000-8000-00805F9B34FB 16 bit 128 bit light steering control ﬂight c still, everybody does this

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i device information manufacturer model number serial number hardware revision ﬁrmware revision software revision ...

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i 0x180A 0x2A29 0x2A24 0x2A25 0x2A27 0x2A26 0x2A28 ... bad for readability,   good for saving bandwidth

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read write write without response notify each characteristic supports one or more of these

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every value is an array of bytes no fancy datatypes, just bytes

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pfew...

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fun with bluetooth boring facts  about

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fun with bluetooth

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web  bluetooth api still not the fun part :-(

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connecting to a device

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navigator.bluetooth.requestDevice({ filters: [ { namePrefix: 'PLAYBULB' } ], optionalServices: [ 0xff0f ] }) .then(device => device.gatt.connect()) .then(server => server.getPrimaryService(0xff0f)) .then(service => service.getCharacteristic(0xfffc)) .then(characteristic => { return characteristic.writeValue( new Uint8Array([ 0x00, r, g, b ]) ); }) 1 we tell the browser what   kind of device we want

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the user selects the actual device

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writing data

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reading data

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navigator.bluetooth.requestDevice({ ... }) .then(device => device.gatt.connect()) .then(server => server.getPrimaryService(0xff0f)) .then(service => service.getCharacteristic(0xfffc)) .then(c => c.readValue()) .then(value => { let r = value.getUint8(1); let g = value.getUint8(2); let b = value.getUint8(3); }) read some bytes

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get notiﬁed of changes

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navigator.bluetooth.requestDevice({ ... }) .then(device => device.gatt.connect()) .then(server => server.getPrimaryService(0xff0f)) .then(service => service.getCharacteristic(0xfffc)) .then(c => { c.addEventListener('characteristicvaluechanged', e => { let r = e.target.value.getUint8(1); let g = e.target.value.getUint8(2); let b = e.target.value.getUint8(3); }); c.startNotifications(); }) add event listener don't forget to start listening

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things you need to know: • javascript  • the webbluetooth api • promises • typed arrays duh!

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browser support Chrome Opera Samsung  (behind ﬂag) Servo  (soon)

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browser support Chrome Opera Samsung  (behind ﬂag) kinda works Servo  (soon) WebBLE  for iOS

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and... npm install node-web-bluetooth

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and... the puck.js

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command-  line tools Oh, come on! (linux)

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hcitool lescan  LE Scan ... 82:4C:4B:17:AC:E6 PLAYBULB sphere 11:75:58:1B:52:85 TimeBox-mini-light D9:97:A2:35:42:2C BB-422C D5:72:4A:3F:C2:1F Puck.js c21f scan for   ble devices

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gatttool --device=82:4C:4B:17:AC:E6 --characteristics    handle = 0x0002, char properties = 0x20,   char value handle = 0x0003,   uuid = 00002a05-0000-1000-8000-00805f9b34fb  handle = 0x0028, char properties = 0x06,   char value handle = 0x0029,   uuid = 0000fffc-0000-1000-8000-00805f9b34fb handle = 0x004a, char properties = 0x02,   char value handle = 0x004b,   uuid = 00002a50-0000-1000-8000-00805f9b34fb get a list   of all   characteristics

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gatttool --device=82:4C:4B:17:AC:E6   --char-read --handle=0x0029    Characteristic value/descriptor: 00 00 00 ff reading the value   of a characteristic

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gatttool --device=82:4C:4B:17:AC:E6   --char-write --handle=0x0029 --value=0000ff00  writing the value   of a characteristic

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custom characteristics. wtf!

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writing a value: function(r, g, b) { return new Uint8Array([ 0x00, r, g, b ]); } reading a value: function(buffer) { return {   r: buffer.getUint8(1),   g: buffer.getUint8(2),   b: buffer.getUint8(3)   } } writing to and reading  from the same characteristic

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writing a value: function(r, g, b) { return new Uint8Array([ 0x01, g, 0x01, 0x00, 0x01,   b, 0x01, r, 0x01, 0x00   ]); } reading the current   color is not possible

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writing a value:   function(r, g, b) { var buffer = new Uint8Array([   0xaa, 0x0a, 0xfc, 0x3a, 0x86, 0x01, 0x0d,   0x06, 0x01, r, g, b, 0x00, 0x00,   (Math.random() * 1000) & 0xff, 0x55, 0x0d   ]); for (var i = 1; i < buffer.length - 2; i++) { buffer[15] += buffer[i]; } return buffer; } reading the current   color is not possible

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reading a value: add event listener write a speciﬁc value get the event with the color 1 2 3 service 0xffe0  characteristic 0xffe4 service 0xffe5  characteristic 0xffe9

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adafruit  bluetooth   sniffer

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demo ﬁnally the fun part

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warning experimental technology  setting low expectations

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warning wiﬁ interference  lowering them even further

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https:/ /bluetooth.rocks/lightbulb  https:/ /github.com/NielsLeenheer/BluetoothBulb change the colour   of a lightbulb

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https:/ /bluetooth.rocks/racer https:/ /github.com/NielsLeenheer/BluetoothRacer control a lego racer   using a gamepad use css animations to   deﬁne a path

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https:/ /bluetooth.rocks/drone  https:/ /github.com/poshaughnessy/web-bluetooth-parrot-drone control a drone   from your browser

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https:/ /bluetooth.rocks/pixel pixel matrix display

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https:/ /bluetooth.rocks/pulse  https:/ /github.com/NielsLeenheer/BluetoothPulse ﬁnd out your   current heartbeat