MQTT Broker IP address or hostname Port Use TLS Username Password Retain LastWillAndTestament (What's this?) [Experimental] If set, sets Retain on the Last Will and Testament message. Only turn this off if you use a broker that does not support this(e.g. AWS IoT Core) Defaults to True Root Cert Path (.pem/.crt) (What's this?) [Experimental] If set, use this certificate in the TLS configuration for the MQTT connection. This will be a pem or crt file provided by your broker. Client Cert Path (.pfx) (What's this?) [Experimental] If set, use this certificate in the TLS configuration for the MQTT connection. This should be the private key .pfx file for a device created in your broker corresponding to this Windows PC. Save