Well, you triggered me to lift the hood on this after the previous thread went dormant and after just today noticing slightly different menu verbiage under the Hisense/Google Settings.
Channels & Input - External inputs - Network IP Control Port - ON/OFF
Seems somebody has found some level of success communicating to a Hisense TV.
""
Yes, using port 7310 for me works for a TCP connection and command from that link. For example, power on is: SALLPOWR0001\xCB\x0D
""
Edit Add 1:
Just now discovering relevant Hisense documentation. Haven't looked into it. I did just flip the switch in the menu to enable this on the TV so I will start looking into it more seriously.
The manual below came up in a search with another manual that is directed at businesses wanting to use Hisense monitors for commercial displays ...but it may lead to instructions that work on their Google TVs.
https://www.hisense-b2b.com/en/Attachment/DownloadFile?downloadId=519
Edit Add 2:
Doesn't seem different than what was discovered a year ago.
Port Scan Results:
7000
8088
9001
Services Identified:
airplay
androidtvremote2
