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Let's Get Physical
- 3. @joel__lord #midwestjs Our Agenda for today… • What is Bluetooth • The Physical Web • Web Bluetooth API • Demos, code and lots of fun • Q&A
- 7. @joel__lord #midwestjs Why use it? • Available on modern devices • Stable • Good Range • Connectivity • Auto Pair
- 13. @joel__lord #midwestjs For more on Bluetooth specs: https://www.bluetooth.com/specifications/gatt
- 15. @joel__lord #midwestjs The Physical Web • Everything is a tap away • See what’s useful around you • Any object or place can broadcast content
- 21. @joel__lord #midwestjs What you need • A URL that you want to broadcast • Has to resolve to HTTPS and public • Has to be less than 18 characters • A phone or device that can receive nearby notifications
- 28. @joel__lord #midwestjs Broadcast that URL • You will need • Compatible Bluetooth 4.0 USB adapter or built-in BT (Macbook Pro) • NodeJs • See full list of requirements
- 30. @joel__lord #midwestjs Broadcast that URL var beacon = require("eddystone-beacon"); var options = { name: "MyBeacon" }; var url = "https://goo.gl/SuTBBh"; beacon.advertiseUrl(url, options);
- 31. @joel__lord #midwestjs Broadcast that URL var beacon = require("eddystone-beacon"); var options = { name: "MyBeacon" }; var url = "https://goo.gl/SuTBBh"; beacon.advertiseUrl(url, options);
- 32. @joel__lord #midwestjs Broadcast that URL var beacon = require("eddystone-beacon"); var options = { name: "MyBeacon" }; var url = "https://goo.gl/SuTBBh"; beacon.advertiseUrl(url, options);
- 33. @joel__lord #midwestjs Broadcast that URL var beacon = require("eddystone-beacon"); var options = { name: "MyBeacon" }; var url = "https://goo.gl/SuTBBh"; beacon.advertiseUrl(url, options);
- 34. @joel__lord #midwestjs Broadcast that URL var beacon = require("eddystone-beacon"); var options = { name: "MyBeacon" }; var url = "https://goo.gl/SuTBBh"; beacon.advertiseUrl(url, options);
- 37. @joel__lord #midwestjs What about controlling devices? • Available in Chrome 56 and Chrome for Android M • Lets you: • Request and connect to nearby Bluetooth devices • Read and write Bluetooth Characteristics • Receive GATT Notifications • Know about disconnects
- 38. @joel__lord #midwestjs What about controlling devices? • Still experimental • Full specs here • Only Google implementing it so far • Security is a big concern
- 39. @joel__lord #midwestjs What about controlling devices • You will need a compatible browser • Understanding of Promises • A User gesture event document.querySelector("button") .addEventListener("click", _ => { //User event });
- 41. @joel__lord #midwestjs Web Bluetooth API • First, we need to connect to a device. • Requires a mandatory service filter navigator.bluetooth.requestDevice({ filters: [ { services: ['heart_rate'] } ]}) .then(device => { /* ... */ }) .catch(error => { console.log(error); });
- 42. @joel__lord #midwestjs Web Bluetooth API • First, we need to connect to a device. • Requires a mandatory service filter navigator.bluetooth.requestDevice({ filters: [ { services: ['heart_rate'] } ]}) .then(device => { /* ... */ }) .catch(error => { console.log(error); });
- 43. @joel__lord #midwestjs Web Bluetooth API • You can see all the devices but you will get an error later if you don’t add a service filter navigator.bluetooth.requestDevice({acceptAllDevices: true}) .then(device => { /* ... */ }) .catch(error => { console.log(error); });
- 44. @joel__lord #midwestjs Web Bluetooth API • First, we need to connect to a device. • Requires a mandatory service filter navigator.bluetooth.requestDevice({ filters: [ { services: ['heart_rate'] } ]}) .then(device => { /* ... */ }) .catch(error => { console.log(error); });
- 45. @joel__lord #midwestjs Web Bluetooth API • First, we need to connect to a device. • Requires a mandatory service filter navigator.bluetooth.requestDevice({ filters: [ { services: ['heart_rate'] } ]}) .then(device => { /* ... */ }) .catch(error => { console.log(error); });
- 46. @joel__lord #midwestjs Web Bluetooth API • You can *then* connect to the device and get information about this device navigator.bluetooth.requestDevice(options) .then(device => { // Human-readable name of the device. console.log(device.name); }) .catch(error => { console.log(error); });
- 47. @joel__lord #midwestjs Web Bluetooth API • Once you have a device, you can access the GATT server navigator.bluetooth.requestDevice(options) .then(device => { // Attempts to connect to remote GATT Server. return device.gatt.connect(); }) .then(server => { /* ... */ }) .catch(error => { console.log(error); });
- 48. @joel__lord #midwestjs Web Bluetooth API • Once you have a device, you can access the GATT server navigator.bluetooth.requestDevice(options) .then(device => { // Attempts to connect to remote GATT Server. return device.gatt.connect(); }) .then(server => { /* ... */ }) .catch(error => { console.log(error); });
- 49. @joel__lord #midwestjs Web Bluetooth API • And you can now access the service to get the desired characteristic navigator.bluetooth.requestDevice(options) .then(device => device.gatt.connect()) .then(server => { // Getting Battery Service return server.getPrimaryService('battery_service'); }) .then(service => { // Getting Battery Level Characteristic. return service.getCharacteristic('battery_level'); }) .catch(error => { console.log(error); });
- 50. @joel__lord #midwestjs Web Bluetooth API • And you can now access the service to get the desired characteristic navigator.bluetooth.requestDevice(options) .then(device => device.gatt.connect()) .then(server => { // Getting Battery Service return server.getPrimaryService('battery_service'); }) .then(service => { // Getting Battery Level Characteristic. return service.getCharacteristic('battery_level'); }) .catch(error => { console.log(error); });
- 51. @joel__lord #midwestjs Web Bluetooth API • You can finally read the value of the characteristic navigator.bluetooth.requestDevice(options) .then(device => device.gatt.connect()) .then(server => server.getPrimaryService('battery_service')) .then(service => service.getCharacteristic('battery_level')) .then(characteristic => { // Reading Battery Level return characteristic.readValue(); }) .then(value => { console.log('Characteristic value: ' + value); }) .catch(error => { console.log(error); });
- 52. @joel__lord #midwestjs Web Bluetooth API • You can finally read the value of the characteristic navigator.bluetooth.requestDevice(options) .then(device => device.gatt.connect()) .then(server => server.getPrimaryService('battery_service')) .then(service => service.getCharacteristic('battery_level')) .then(characteristic => { // Reading Battery Level return characteristic.readValue(); }) .then(value => { console.log('Characteristic value: ' + value); }) .catch(error => { console.log(error); });
- 53. @joel__lord #midwestjs Web Bluetooth API • When reading the value, it returns a ArrayBuffer which you need to convert into an int value navigator.bluetooth.requestDevice(options) .then(device => device.gatt.connect()) .then(server => server.getPrimaryService('battery_service')) .then(service => service.getCharacteristic('battery_level')) .then(characteristic => characteristic.readValue()) .then(value => { var intVal = value.getUint8(0); console.log('Battery percentage is ' + intVal); }) .catch(error => { console.log(error); });
- 54. @joel__lord #midwestjs Web Bluetooth API • Or subscribe to the notifications navigator.bluetooth.requestDevice(options) .then(device => device.gatt.connect()) .then(server => server.getPrimaryService('battery_service')) .then(service => service.getCharacteristic('battery_level')) .then(c => { // Set up event listener for when characteristic value changes. c.addEventListener('characteristicvaluechanged', console.log); }) .catch(error => { console.log(error); });