Automation - MQTT

• Proven on Mint 19.3
• Proven on SparkyLinux 5.11
• Proven on raw Debian (With a caveat)

Mosquitto MQTT Broker

Installing Mosquitto

• sudo apt-get install mosquitto

Pretty simple, eh?

Ensure that Mosquitto broker is running

• sudo service mosquitto status

expected result is Active: active (running)

Install client tools for testing etc

(Do this on any machine expected to manually use MQTT)

• sudo apt install mosquitto-clients

Testing

In a terminal:

• mosquitto_sub -h localhost -t "mqtt" -v

In another terminal:

• mosquitto_pub -h localhost -t "mqtt" -m "Hello MQTT"

Now the message “mqtt Hello MQTT” will be displayed in the first terminal where the topic “mqtt” is subscribed.

Subscribing to # gives you a subscription to everything except for topics that start with a $ (these are normally control topics anyway).