Ethernet over HDMI

Thanks for this. Looks like it’s a rare protocol.

Excerpt from the article

If you have an HEC-compatible device, it will most likely be self-described somewhere in the user’s manual. Unfortunately, this technology is rarely implemented, and you would be hard-pressed to find a device that uses HEC. Through our research, we were unable to find any modern consumer device that uses HEC.

I am slightly relieved.