Installation MQTT-Server (Broker) Mosquitto unter Debian¶

Pakete installieren¶

sudo apt install mosquitto mosquitto-clients

Konfiguration¶

/etc/mosquitto/mosquitto.conf

# 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

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

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

Test¶

mosquitto_sub -h localhost -t '#' -v

Script zum Löschen von persistenten Daten¶

cleanmqtt.sh:

#!/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