How to Install and Secure Mosquitto MQTT Broker on Ubuntu 24.04

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Mosquitto is a lightweight, open-source MQTT message broker designed for IoT devices operating under low bandwidth or limited power conditions. It uses a publish-subscribe model where publishers send messages to a broker and subscribers receive them via designated topics. The broker can be installed on Ubuntu 24.04 from the default package repositories and managed as a systemd service. Command-line client tools allow users to test message exchange by publishing and subscribing to topics. Security can be enforced by disabling anonymous access and configuring password-based authentication using an encrypted credentials file.

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