Socket.io vs Ably

// Server (Node.js)
import { createServer } from 'http';
import { Server } from 'socket.io';

const httpServer = createServer();
const io = new Server(httpServer, { cors: { origin: '*' } });

io.on('connection', (socket) => {
  console.log('client connected', socket.id);
  socket.on('message', (data) => io.emit('message', data));
});

httpServer.listen(3001);

// Client
import { io } from 'socket.io-client';
const socket = io('http://localhost:3001');
socket.on('message', (data) => console.log(data));

import * as Ably from 'ably';

const client = new Ably.Realtime(process.env.ABLY_API_KEY!);

// Subscribe to a channel
const channel = client.channels.get('my-channel');
await channel.subscribe('greeting', (message) => {
  console.log('Received:', message.data);
});

// Publish a message
await channel.publish('greeting', { text: 'Hello from Ably!' });

// Clean up
client.close();