Know-how

h1. Installation MQTT-Server (Broker) Mosquitto unter Debian

h2. Pakete installieren

<pre><code class="shell">

sudo apt install mosquitto mosquitto-clients

</code></pre>

h2. Konfiguration

/etc/mosquitto/mosquitto.conf 

<pre>

# Place your local configuration in /etc/mosquitto/conf.d/

#

# A full description of the configuration file is at

# /usr/share/doc/mosquitto/examples/mosquitto.conf.example

pid_file /var/run/mosquitto.pid

persistence true

persistence_location /var/lib/mosquitto/

persistent_client_expiration 30d

log_timestamp_format %Y-%m-%dT%H:%M:%S

log_dest file /var/log/mosquitto/mosquitto.log

include_dir /etc/mosquitto/conf.d

</pre>

Im Verzeichnis /etc/mosquitto/conf.d werden die Konfigurationsdateien hinterlegt. Die Angaben in spitzen Klammern, wie <host> sind anzupassen, die Spitzen Klammern sind wegzulassen. Beispiel für eine Verbindung (Bridge) zu einem anderen Mosquitto-Broker:

/etc/mosquitto/conf.d/andino.conf

<pre>

listener 1883

allow_anonymous true

connection <bridge-name>

address <host>:8883

bridge_cafile /etc/ssl/certs/ISRG_Root_X1.pem

remote_username <username>

remote_password <password>

try_private true

cleansession true

# topic abc/def/# out 1 "" <prefix>/

# topic # in 1 <prefix>/ ""

topic # both 1

</pre>

h2. Test

<pre>

mosquitto_sub -h localhost -t '#' -v

</pre>

h2. Script zum Löschen von persistenten Daten

cleanmqtt.sh:

<pre><code class="shell">

#!/bin/sh

# Clean mqtt from all retained messages.

# Usage: ./cleanmqtt hostname

# 2020-11-05 MG

echo "cleaning " $1 " :: usage: cleanmqtt <host>"

mosquitto_sub -h $1 -t "#" -v --retained-only | while read line

do

	mosquitto_pub -h $1 -t "${line% *}" -r -n

done

</code></pre>