Creating a certificate for each MQTT client

Now, we want to require each MQTT client to provide a valid certificate to establish a connection with the MQTT server. This way, only the clients that have a valid certificate will be able to publish or subscribe to topics. We will use the previously created private certificate authority to create client certificates for authentication.

We will generate a sample certificate for our local computer that will act as a client. We can follow the same procedure to generate additional certificates for additional devices that we want to be able to connect to the Mosquitto server. We just need to use a different name for the file and use a different device name in the corresponding option.

Tip

We must use the same certificate authority certificate that we used to generate the server certificate to generate the client certificates.

First, we must generate a new private key that will be different from the private keys we generated for our own private certificate...