I know there is a module for fhem,

https://github.com/BenRoe/MMM-FHEM

but most of the people can’t use because mostly every fhem system uses a user and password to login. U can only use it if you don’t protect your system.
Maybe some developers can update the version or make their own version cause I think a lot of people would love it.

Maybe also integrate a list of devices which are turned on and off so u can edit the list of the devices you want to show on the mirror.

Thank you very much.