dirigera/dist/src/mdnsDiscovery.js

A TypeScript client for IKEA's DIRIGERA smart home hub

import createMdnsServer from 'mdns-server';
const name = '_ihsp._tcp.local.';
export const discoverGatewayIP = async (timeoutMilliseconds = 10000) => {
    const mdnsServer = createMdnsServer({
        reuseAddr: true,
        loopback: false,
        noInit: true,
    });
    return new Promise((resolve, reject) => {
        const timeout = setTimeout(() => {
            rejectWithError(new Error('Gateway discovery timed out. Try specifying the gateway IP address explicitly.'));
        }, timeoutMilliseconds);
        const resolveWithValue = (value) => {
            clearTimeout(timeout);
            mdnsServer.destroy();
            resolve(value);
        };
        const rejectWithError = (error) => {
            clearTimeout(timeout);
            mdnsServer.destroy();
            reject(error);
        };
        mdnsServer.on('response', (response) => {
            const ipv4 = response?.answers?.find((a) => a.type === 'A')?.data;
            if (ipv4) {
                return resolveWithValue(ipv4);
            }
            const ipv6 = response?.answers?.find((a) => a.type === 'AAAA')?.data;
            if (ipv6) {
                return resolveWithValue(`[${ipv6}]`);
            }
        });
        mdnsServer.on('ready', () => {
            mdnsServer.query([
                { name, type: 'A' },
                { name, type: 'AAAA' },
                { name, type: 'PTR' },
            ]);
        });
        mdnsServer.on('error', rejectWithError);
        mdnsServer.initServer();
    });
};