...
Use TLS: Enables TLS for the network connection. When disabled the link does not use any authentication or encryption.
TLS client certificates need to be stored in the local certificate store. To do this open Run and open Certlm.msc. Open Personal and right click on Certificates. Select All Tasks and Import. Select the Certificate required and follow the instructions through on default settings. The import will confirm it has been successful at finish.
Advanced
Will Topic: This is the topic that the LWT (Last Will and Testament) message will be sent to. If the client disconnects, the MQTT broker will automatically post the LWT message to the Will Topic. It is used to keep track of the clients connection state. If the client disconnects, it posts: "{"connected":false}" and when it connects, it posts: "{"connected":true}" to the Will Topic. By default, it is set to “/clearway/status”.
...