HiveMQ Public Broker: connection details & online test

Endpoints and ports

About HiveMQ Public Broker

The HiveMQ public broker is a free MQTT sandbox operated by HiveMQ. It accepts anonymous connections on plain TCP, TLS and WebSockets, which makes it a common default in tutorials and sample code.

Because it is completely open, every message you publish can be read by anyone subscribed to the same topic. Use unique topic names and never send real data through it.

Highlights

• No sign-up or credentials
• TCP, TLS, WS and WSS endpoints
• Commonly used in tutorials

Limitations

• Fully public — anyone can read your topics
• No authentication or access control
• No uptime guarantee; intended for testing only

Connect with code

mosquitto_sub -h broker.hivemq.com -p 1883 -t 'testmqtt/hivemq/#' -v

import mqtt from 'mqtt';

const client = mqtt.connect('wss://broker.hivemq.com:8884/mqtt');

client.on('connect', () => {
  client.subscribe('testmqtt/hivemq/#');
  client.publish('testmqtt/hivemq/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.