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elfy.js
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elfy.js
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async function exponentialBackoff(max, delay, toTry, success, fail) {
try {
const result = await toTry();
console.log('result', result);
success(result);
} catch(error) {
if (max === 0) {
return fail();
}
time('Retrying in ' + delay + 's... (' + max + ' tries left)');
setTimeout(function() {
exponentialBackoff(--max, delay * 2, toTry, success, fail);
}, delay * 1000);
}
}
class Elfy {
constructor() {
this.device = null;
this.isReady = false;
this.onDisconnected = this.onDisconnected.bind(this);
}
isReady() {
return this.isReady;
}
async request() {
let options = {
"filters": [{
"namePrefix": "b+EMIE"
}],
"optionalServices": ['6e402001-b5a3-f393-e0a9-e50e24dcca9e']
};
this.device = await navigator.bluetooth.requestDevice(options);
if (!this.device) {
throw "No device selected";
}
this.device.addEventListener('gattserverdisconnected', this.onDisconnected);
}
async connect() {
if (!this.device) {
return Promise.reject('Device is not connected.');
}
await exponentialBackoff(3, 2,
async () => await this.device.gatt.connect(),
() => console.log('Connected.'),
() => console.log('Failed to connect')
);
}
async writeGreen() {
const green = new Uint8Array([0xaa, 0x16, 0x00, 0xff, 0x00]);
await this.writeData(green);
}
async writePink() {
const color = new Uint8Array([0xaa, 0x16, 0x0a, 0x00, 0x09]);
await this.writeData(color);
}
// aa 15 0r gb 0000 0fff 0fff 0fff etc
async defaultWhiteOnly() {
const color = new Uint8Array([0xaa, 0x15, 0x0a, 0xaa, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]);
await this.writeData(color);
console.log('white');
}
async defaultRGB() {
const color = new Uint8Array([0xaa, 0x15, 0x0a, 0xaa, 0x0a, 0x00, 0x00, 0xa0, 0x00, 0x0a, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]);
await this.writeData(color);
console.log('rgb');
}
async writeData(data) {
if (this.isReady) {
const service = await this.device.gatt.getPrimaryService('6e402001-b5a3-f393-e0a9-e50e24dcca9e');
const characteristic = await service.getCharacteristic( '6e402002-b5a3-f393-e0a9-e50e24dcca9e');
await characteristic.writeValue(data);
} else {
console.debug('Device is not ready');
}
}
disconnect() {
if (!this.device) {
return Promise.reject('Device is not connected.');
}
return this.device.gatt.disconnect();
}
onDisconnected() {
console.log('Device is disconnected.');
this.isReady = false;
console.debug('Reconnecting...');
this.reconnect();
}
async reconnect() {
await this.connect();
this.isReady = true;
console.log('Reconnected');
}
async start() {
try {
await this.request();
await this.connect();
this.isReady = true;
console.log('ready');
} catch(error) {
console.log(error);
}
}
async writeColors(r, g, b) {
try {
const colors = [r, g, b]
.map(e => e / 16)
.map(e => Math.floor(e));
const command = new Uint8Array([0xaa, 0x16].concat(colors));
if (this.isReady) {
return await this.writeData(command);
}
} catch(error) {
console.error(error);
}
}
}
export default Elfy;