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index.js
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index.js
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import AnimationService from "./AnimationService.js";
import config from "./config.js";
export default class MundusBluetoothService {
constructor() {
this.listeners = {
press: null,
move: null,
step: null,
version: null,
batteryCharge: null,
chargeState: null,
leds: null,
brightness: null,
};
this.server = null;
this.services = {
board: null,
battery: null,
leds: null,
};
this.characteristics = {
press: null,
move: null,
step: null,
version: null,
batteryCharge: null,
chargeState: null,
leds: null,
brightness: null,
};
}
async connect() {
const device = await navigator.bluetooth.requestDevice({
filters: Object.values(config.serviceUUIDs).map((service) => ({
services: [service.serviceUUID],
})),
});
this.device = device;
return device;
}
async disconnect() {
this.server.disconnect();
}
async startListeners() {
this.device.addEventListener(
"gattserverdisconnected",
this._onDisconnected
);
this.server = await this.device.gatt.connect();
await Promise.all(
Object.entries(config.serviceUUIDs).map(
async ([serviceName, service]) => {
const btService = await this.server.getPrimaryService(
service.serviceUUID
);
this.services[serviceName] = btService;
await Promise.all(
Object.entries(service.characteristicUUIDs).map(
async ([characteristicName, characteristicUUID]) => {
const btCharacteristic = await btService.getCharacteristic(
characteristicUUID
);
this.characteristics[characteristicName] = btCharacteristic;
await btCharacteristic.startNotifications();
btCharacteristic.addEventListener(
"characteristicvaluechanged",
this._eventTriger(characteristicName)
);
}
)
);
}
)
);
}
async read(characteristicName) {
const data = await this.characteristics[characteristicName].readValue();
return translateCharacteristicValue(data);
}
async write(characteristicName, data) {
await this.characteristics[characteristicName].writeValueWithResponse(
stringToArrayBuffer(data)
);
}
addListenerCallback(characteristicName, callback) {
this.listeners[characteristicName] = callback;
}
removeListenerCallback(characteristicName) {
this.listeners[characteristicName] = null;
}
_onDisconnected(event) {
const device = event.target;
console.log(`Device ${device.name} is disconnected.`);
}
_eventTriger(eventName) {
return (event) => {
if (this.listeners[eventName]) {
this.listeners[eventName](
translateCharacteristicValue(event.target.value)
);
}
};
}
}
function translateCharacteristicValue(value) {
const buffer = Buffer.from(value.buffer, "base64");
const data = buffer.toString("utf8");
return data;
}
function stringToArrayBuffer(str) {
return new TextEncoder().encode(str);
}
export { AnimationService };