Linux.mqtt

Root — Fri, 03 Jul 2026 17:24:06 GMT

mosquitto

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			== mosquitto ==

			#
			# a MQTT broker is a 24/7 message relay/örtöö for topics
			# it is not a database, the broker duplicates messages for all subscribers
			# you can ask if you get notified if a topic of your interest changes (="subscribe")
			# you can send out a message (="publish") so all subscribers get it
			# The Broker is not persistent so values from "missed" messages can not be retrieved
			# But, if a Client publish a value with a "retain"-Flag the Broker hold the value for a time
			# after the publish by system A, if a client system B is a bit late - still unconnected, in the moment subscribing
			# to a retained message, system B gets the last known value stored by the broker. System B so
			# must not wait for the next live value, wich maybe come in minutes or hours
			#



			* installation

			apt install mosquitto

			* /etc/mosquitto/mosquitto.conf erweitern:

			allow_anonymous false
			password_file /etc/mosquitto/passwd
			listener 1883 0.0.0.0

			* user anlegen

			mosquitto_passwd -c -b /etc/mosquitto/passwd <i>user</i> <i>password</i>

			* neustart

			systemctl restart mosquitto

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