Hi hamza995,

The purpose of LMQTT is to allow a controller to communicate as a MQTT client. It is likely that your power meter will also work as a MQTT client. So both would need a MQTT broker to communicate with.

To be honest, I don't have much experience with WinCC Professional, but I don't know of any MQTT broker option for WinCC Professional. Also the "WinCC Cloud Connector" only works as a MQTT client.

So I do not know any MQTT broker from Siemens, but you will find others if you search the internet.

Kind regards
Stefan