https://www.linovision.com/4k-poe-ip-un ... inspection
According to the manual it looks as though I should be able to control the LED and other features via HTTP URL commands, but I am stumbling over how the URL should be formatted.
These are the various combinations I have tried:
http://172.16.5.91/LAPI/V1.0/Channels/0 ... 2817%0A%7D
http://172.16.5.91/LAPI/V1.0/PTZ/PTZCmd=2817/
http://172.16.5.91/LAPI/V1.0/Channels/0 ... ZCmd:2817/
http://172.16.5.91/LAPI/V1.0/Channels/0 ... %221%22%7D
While they all give some sort of reply, this one was most promising, but the "PTZCmd" value isn't being passed:
http://172.16.5.91/LAPI/V1.0/Channels/0 ... ZCmd":2817}

Manual can be downloaded here: https://docdro.id/6dX2dqp