Eldiabolo18

I would just run wireshark/tcpdump, ideally on the switchport or if possibel between switch and tv. Maybe you have a spare computer w two ports which you can bridge and then inspect traffic

If you use luks, you can just add dropbear to have a ssh-server running and enter your password there.

Regarding the ASRock Paul, theres a lenghty discussion on the Level1 Tech Forums: https://forum.level1techs.com/t/asrock-rack-introduces-the-paul-an-ipmi-pcie-card/162977/74?page=6

I mean thats a pretty shit discription in the MB manual, thank your for providing all necessary information and giving a clear problem.

As others have said, what are you trying to detect here? Unless its all just for fun/testing