Fun with Bluetooth @ Universal JS Day

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fun with bluetooth

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why?

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progressive   web apps

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pwa’s are great !

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but...

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but...

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ethernet   & wiﬁ

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wiﬁ

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zigbee? 

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ethernet

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runs a webserver use fetch or   xmlhttprequest

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[{ "id":"001788fffe100491", "internalipaddress":"192.168.2.23", "macaddress":"00:17:88:10:04:91", "name":"Philips Hue" }, { "id":"001788fffe09a168", "internalipaddress":"192.168.88.252" }, https://www.meethue.com/api/nupnp 1

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1 0 http://192.168.2.23:80/ urn:schemas-upnp-org:device:Basic:1Philips hue (192.168.2.23) Royal Philips Electronics http://192.168.2.23/description.xml 2

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http://192.168.2.23/api  {"devicetype": "hue_pwa#pixel_xl"} 3 [{"success":{"username": "........"}}] User presses physical button on the hub *click* save to local storage

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http://192.168.2.23/api  {"devicetype": "hue_pwa#pixel_xl"} 3 [{"success":{"username": "........"}}] User presses physical button on the hub *click* save to local storage

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4 { "1": { "state": { "on": true, "bri": 144, "hue": 13088, "sat": 212, "xy": [0.5128,0.4147], "ct": 467, "alert": "none", http://192.168.2.23/api/......../lights

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http://192.168.2.23/api/......../lights/1/state  { "hue": 50000, "on": true, "bri": 200 } 5 [ {"success":{"/lights/1/state/bri":200}}, {"success":{"/lights/1/state/on":true}}, {"success":{"/lights/1/state/hue":50000}}

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*click* *click* *reload* *click*

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this does   not work !

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https only http only no certiﬁcate   for you

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= network use remote api’s = access to local devices

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hue remote api also allow control from   outside the local network

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We are currently preparing for release of this remote API which will initially be available to a limited number of partners. “ — Philips

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We are currently preparing for release of this remote API which will initially be available to a limited number of partners. “ — Philips two years ago very just nest,   google assistant   and ifttt

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fun with bluetooth problems local networks

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fun with bluetooth

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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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bluetooth low energy also known as BLE Bluetooth LE Bluetooth Smart Bluetooth 4 and 5

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10 million   bluetooth devices  shipping every day

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mobile phone

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computer

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glucose monitor somebody's hand

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activity tracker

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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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ﬁdget spinner

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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

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generic attribute proﬁle ?

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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: • the webbluetooth api • promises • typed arrays duh!

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browser support Chrome Opera Samsung Servo  (soon)

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browser support Chrome Opera Samsung Servo  (soon) Safari

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browser support Chrome Opera Samsung Servo  (soon) Safari

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

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and...

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and... npm install node-web-bluetooth

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and... npm install cordova-plugin-webbluetooth

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and... the puck.js

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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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writing a value:   function(r, g, b, position) { let buffer = new Uint8Array([ 0x07, 0x02, position + 1, r, g, b ]); return buffer; }

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writing a value:   function(r, g, b, position) { let buffer = new Uint8Array([ 0x58, r, g, b, 0x01, position ]); ...

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writing a value:   function(r, g, b, position) { let buffer = new Uint8Array([ 0x58, r, g, b, 0x01, position ]); let payload = new Uint8Array(buffer.length + 4); payload[0] = payload.length - 2; payload[1] = payload.length - 2 >>> 8; payload.set(buffer, 2); let checksum = payload.reduce((a, b) => a + b, 0); payload[payload.length - 2] = checksum; payload[payload.length - 1] = checksum >>> 8; let extra = payload.filter(value => { 

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message[m] = 0x03; message[m + 1] = 0x05; m += 2; } else if (payload[i] === 0x03) { message[m] = 0x03; message[m + 1] = 0x06; m += 2; } else { message[m] = payload[i]; m++; } } message[0] = 0x01; message[message.length - 1] = 0x02; return message; }

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adafruit  bluetooth   sniffer

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decompiling   the apk don't tell anyone!

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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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#universaljsday

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https:/ /bluetooth.rocks/lightbulb  https:/ /github.com/BluetoothRocks/Lightbulb change the colour   of a lightbulb

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https:/ /bluetooth.rocks/pixel  https:/ /github.com/BluetoothRocks/Matrix draw pixel art on   a led matrix display

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https:/ /bluetooth.rocks/racer https:/ /github.com/BluetoothRocks/Racer 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/BluetoothRocks/Drone control a drone   from your browser

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https:/ /bluetooth.rocks/printer  https:/ /github.com/BluetoothRocks/TweetPrinter print on a receipt printer

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https:/ /bluetooth.rocks/pulse  https:/ /github.com/BluetoothRocks/Pulse ﬁnd out your   current heartbeat