Thank you so much.
If I understand your prior-art question, I think there is a few: - the OSC protocol for audio gear and some other studio equipment. - In the lighting world I heard DMX is king - OBS has a very extensive Websocket client
For PTZ cameras I'm not sure, our old PTZ camera needs HTTP GET-s to weird urls (RPC).
Thanks again for starring!
IP based security cameras have had a lot of proprietary protocols over the years but ONVIF[1] is the standard that's been adopted to communicate to cameras and access control panels.
* [1] https://linkdhome.com/articles/ip-camera-protocols