Difference between revisions of "Automation - MQTT"
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Revision as of 21:55, 14 January 2022
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As always...
Start with:
sudo apt updatesudo apt upgrade
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)
Note: Ubuntu repositories have an outdated version
If you want to know which version you've installed...
mosquitto
(Ignore the error message "Error: Address already in use". It's already running as a service.)
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).
Debian / Version Caveat
During an install on a raw Debian system, I discovered that Mosquitto refused connection when I tried to access it with anything other than "localhost" as the hostname...
Apparently, mosquitto 2.0 binds only to the loopback interface unless specifically told otherwise.
& Debian installs v2.0 or higher...
But for now, It's a simple matter of editing the config file for Mosquitto.
sudo vi /etc/mosquitto/mosquitto.conf
& add in:
listener 1883 allow_anonymous true
Then,
sudo service mosquitto restart