The following steps are how I configured MySQL with OpenHAB. Repeat those steps for every user you want. Username: The username for the MQTT Server.format: text: The default format ('none', 'HTML' or 'monospace') of a message. This is a better approach for many reasons, one being that you cannot start the car without the password. Openhab user password Now the default method is to install OpenHAB is to download it and unzip it to /opt/OpenHAB and then do all the stuff.