Created
May 10, 2017 14:42
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<title>Bluetooth Web API</title> | |
</head> | |
<body> | |
<button class="bt">BT</button> | |
<script> | |
let lamp = null | |
const log = console.log.bind(console); | |
const [button] = document.getElementsByClassName('bt') | |
const toBuff = str => { | |
const buf = new ArrayBuffer(str.length) | |
const view = new Uint8Array(buf) | |
for (var i=0; i < str.length; i++) { | |
bufView[i] = str.charCodeAt(i) | |
} | |
return buf | |
} | |
function str2ab(str) { | |
var buf = new ArrayBuffer(str.length); | |
var bufView = new Uint8Array(buf); | |
for (var i=0, strLen=str.length; i < strLen; i++) { | |
bufView[i] = str.charCodeAt(i); | |
} | |
return buf; | |
} | |
const handleNotifications = evt => { | |
let v = event.target.value; | |
let w = Math.round((v.getUint16(1, true) / 100) / 2) | |
log(w.toString()); | |
log(lamp) | |
let command = `255,255,255,${w}` | |
for (var j = command.length; j < 18; j++) { | |
command += ',' | |
} | |
log(command) | |
lamp && lamp.writeValue(str2ab(command)) | |
} | |
button.addEventListener('pointerup', function(event) { | |
log('called') | |
navigator.bluetooth.requestDevice({ filters: [{ services: ['weight_scale'] }] }) | |
.then(device => (log(device), device.gatt.connect())) | |
.then(server => (log(server), server.getPrimaryService(0x181d))) | |
.then(service => (log(service), service.getCharacteristic(0x2a9d) )) | |
.then(ch => (log(ch), ch )) | |
.then(characteristic => { | |
myCharacteristic = characteristic; | |
return myCharacteristic.startNotifications().then(_ => { | |
log('> Notifications started'); | |
myCharacteristic.addEventListener('characteristicvaluechanged', | |
handleNotifications); | |
}); | |
}) | |
.catch(error => { log(error); }); | |
}); | |
</script> | |
<button class="bt2">lamp</button> | |
<script> | |
const [button2] = document.getElementsByClassName('bt2') | |
button2.addEventListener('pointerup', function(event) { | |
log('called', 0xFFF0) | |
navigator.bluetooth.requestDevice({ filters: [{ services: [0xFFF0] }] }) | |
.then(device => (log(device), device.gatt.connect())) // | |
.then(server => (log(server), server.getPrimaryService(0xFFF0))) | |
.then(service => (log(service), service.getCharacteristic(0xFFF1) )) | |
.then(ch => (log(ch), ch )) | |
.then(characteristic => { | |
lamp = characteristic | |
}) | |
.catch(error => { log(error); }); | |
}); | |
</script> | |
</body> | |
</html> |
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