Using certificates will give you an additional layer of security for your MQTT communication.
To integrate MQTT with certificate into Home Assistant, add the following section to your
# Example configuration.yaml entry mqtt: certificate: /home/paulus/dev/addtrustexternalcaroot.crt
certificate (Optional): ‘auto’ or the certificate authority certificate file that is to be treated as trusted by this client. ‘auto’ uses the bundled certificates. If a file is specified the file should contain the root certificate of the certificate authority that signed your broker’s certificate, but may contain multiple certificates. Example:
client_key (Optional): Client key, eg.
client_cert (Optional): Client certificate, eg.