Eclipse Mosquitto Test Server: connection details & online test

Endpoints and ports

Credentials: rw / readwrite. Optional. Authenticated listeners (e.g. port 1884) accept rw / readwrite.

About Eclipse Mosquitto Test Server

test.mosquitto.org is the public test server of the Eclipse Mosquitto project. It often runs development builds of Mosquitto and exposes many listeners, including authenticated and certificate-based variants.

It is intended for testing clients against Mosquitto and can be restarted or upgraded at any time.

Highlights

• Runs the reference Mosquitto implementation
• Many listener variants (TLS, client certs, auth)
• No sign-up

Limitations

• Fully public
• Frequently restarted, may run unstable builds
• Can be slow under load

Connect with code

mosquitto_sub -h test.mosquitto.org -p 1883 -t 'testmqtt/mosquitto/#' -v

import mqtt from 'mqtt';

const client = mqtt.connect('wss://test.mosquitto.org:8081');

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