There are “M” commands to turn it on and off. Pretty much every cam software will issue the on at the beginning, and off at the end - or at least, I haven’t found one that doesn’t. That will turn the switch on and off. If the vac is plugged into that socket, it’ll turn on and off. The IOT switch has a “normally on” and a “normally off” outlet. You would plug the router and the vac into the “normally off” sockets.
…use the vac when not using the router - that’s a lot more complicated and requires some more sophisticated electrical setup that is going to be difficult to explain this way. @azbrewer has the basics in his post, so I won’t go there.