How can I use MQTT with Node.js?

How can I use MQTT with Node.js?

You can use the 'mqtt' package in Node.js to connect to an MQTT broker. Would you like a code example?

Yes, please provide a simple code example.

Here's a basic example:

const mqtt = require('mqtt');
const client = mqtt.connect('mqtt://broker.hivemq.com');

client.on('connect', () => {
  console.log('Connected to MQTT broker');
  client.subscribe('test/topic', (err) => {
    if (!err) {
      client.publish('test/topic', 'Hello MQTT!');
    }
  });
});

client.on('message', (topic, message) => {
  console.log(`Received message: ${message.toString()}`);
});

What is an MQTT broker and why do I need one?

An MQTT broker is a server that manages message distribution between clients. You need one to facilitate communication.