Hello, I am trying to integrate MAG254 box with a Home Automation System, and I need to have the control over ethernet, but I can not find the way how to do it. Can anyone help me with this?

Not sure if this can be linked to your HAS but it is a way of controlling the STB remotely.

https://wiki.infomir.eu/eng/set-top-box/stb-linux-webkit/embedded-portal/remote-control-app