libmosquitto1 - 2.0.11-1+deb11u1 main

This is a C library for implementing MQTT version 5.0/3.1.1/3.1 clients.
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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.