This is a message broker that supports version 5.0, 3.1.1, and 3.1 of the MQTT protocol. MQTT provides a method of carrying out messaging using a publish/subscribe model. It is lightweight, both in terms of bandwidth usage and ease of implementation. This makes it particularly useful at the edge of the network where a sensor or other simple device may be implemented using an arduino for example.

By default mosquitto will be installed as a system service, using the default configuration at /snap/mosquitto/current/default_config.conf. If this does not meet your needs, create the file /var/snap/mosquitto/common/mosquitto.conf and this will be used instead. Note that only files inside /var/snap/mosquitto/common can be read by mosquitto, you cannot put other configuration files in /etc/mosquitto.

In addition to the latest channel, there are also the 1.5 and 1.6 channels which you can use to track those versions.

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