rxpoweredup/src/hub-scanner/hub-scanner.js

A Typescript RxJS-based library for controlling LEGO Powered UP hubs & peripherals.

import { from, map } from 'rxjs';
import { HUB_SERVICE_UUID } from '../constants';
export class HubScanner {
    hubScannerErrorFactory;
    bluetoothApi;
    constructor(hubScannerErrorFactory, bluetoothApi) {
        this.hubScannerErrorFactory = hubScannerErrorFactory;
        this.bluetoothApi = bluetoothApi;
    }
    discoverHub() {
        return from(this.bluetoothApi.requestDevice({
            filters: [{ services: [HUB_SERVICE_UUID] }],
        })).pipe(map((device) => {
            if (this.isDeviceWithGatt(device)) {
                return device;
            }
            else {
                throw this.hubScannerErrorFactory.createGattUnavailableError();
            }
        }));
    }
    isDeviceWithGatt(device) {
        return !!device.gatt;
    }
}