The objective here is to start/stop the consumption of camera stream from Smart Client.
Thanks.
XProtect comes with a Default Start Feed rule, I suggest you disable this rule and create your own rule to control whether camera feed is started or not. You could then create events which could be used to control the feed and trigger those events from a MIP SDK application.
If you disable a camera the effect is the same as if you delete a camera when looking at it from the Smart Client perspective. The Smart Client does not know a disabled camera exists. When you enable the camera after the Smart Client is started the Smart Client will have to do a re-login to get to know the camera. It is possible to develop a utility to disable and enable cameras by use of Configuration API, but I must advise against this approach.