EMQX Public Broker: connection details & online test

Endpoints and ports

About EMQX Public Broker

broker.emqx.io is a free public MQTT broker run by EMQ, the company behind EMQX. It supports MQTT 3.1, 3.1.1 and MQTT 5 and exposes TCP, TLS, WebSocket and secure WebSocket listeners.

Like every public sandbox it is shared by many users at once, so treat any topic as visible to the world.

Highlights

• MQTT 5 support
• TCP, TLS, WS and WSS endpoints
• No sign-up

Limitations

• Fully public — anyone can read your topics
• No authentication
• Testing only, no SLA

Connect with code

mosquitto_sub -h broker.emqx.io -p 1883 -t 'testmqtt/emqx/#' -v

import mqtt from 'mqtt';

const client = mqtt.connect('wss://broker.emqx.io:8084/mqtt');

client.on('connect', () => {
  client.subscribe('testmqtt/emqx/#');
  client.publish('testmqtt/emqx/hello', 'Hello from MQTT.js');
});

client.on('message', (topic, payload) => {
  console.log(topic, payload.toString());
});

Having trouble? See common MQTT connection errors or learn how to test an MQTT broker step by step.