Mosquitto SSL Configuration -MQTT TLS Security

In this tutorial we will configure the mosquitto MQTT broker to use TLS security. We will be using openssl to create our own Certificate authority (CA), Server keys and certificates. We will also test the broker by using the Paho Python client to connect to the broker using a SSL connection. You should have a basic understanding of PKI, certificates and keys before proceeding. See SSL and SSL Certificates Explained

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Mosquitto ACL -Configuring and Testing MQTT Topic Restrictions

Not only can you restrict access to the Mosquitto MQTT broker using a username and password you can also restrict access to topics using an ACL (Access control list). Unless you are running an open broker you will want to restrict access to topics so that only authorized users/clients can publish or subscribe to them.

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Mosquitto Username and Password Authentication -Configuration and Testing

The Mosquitto MQTT broker can be configured to require client authentication using a valid username and password before a connection is permitted. The username and password combination is transmitted in clear text, and is not secure without some form of transport encryption.(SSL) However using username and password authentication does provide an easy way of restricting access to a broker.

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