Difference between revisions of "Automation - MQTT"
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expected result is <u><code>Active: active (running)</code></u> | expected result is <u><code>Active: active (running)</code></u> | ||
== Debian Caveat | = Install client tools for testing etc = | ||
(Do this on any machine expected to manually use MQTT) | |||
*<code>sudo apt install mosquitto-clients</code> | |||
== Testing == | |||
=== In a terminal: === | |||
*<code>mosquitto_sub -h localhost -t "mqtt" -v</code> | |||
=== In another terminal: === | |||
*<code>mosquitto_pub -h localhost -t "mqtt" -m "Hello MQTT"</code> | |||
Now the message “<code>mqtt Hello MQTT</code>” will be displayed in the first terminal where the topic “'''mqtt'''” is subscribed. | |||
Subscribing to '''<code>#</code>''' gives you a subscription to everything except for topics that start with a '''<code>$</code>''' (these are normally control topics anyway). | |||
= Debian 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... | 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... | ||
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* <code class="mwt-code">sudo service mosquitto restart</code> | * <code class="mwt-code">sudo service mosquitto restart</code> | ||
[[Category:ServerBuilding]] | [[Category:ServerBuilding]] | ||
[[Category:AutomationServers]] | [[Category:AutomationServers]] | ||
Revision as of 17:33, 12 January 2022
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| 19.3 / 20.3 | 4 | 11 (bullseye) | 20.04.3 | 5.11 |
| (caveat) |
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).
Debian 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