How can I make utorrent stop when someone connects to the network?

I am running an always on PC with windows 7 and utorrent

I want to configure a torrent client (hopefully utorrent) to stop torrents for running when a Pc or phone connects to the network through wifi.
like this when I come home and my phone automatically connects the service stops, and restarts when it is no longer connected.
the same would happen, if a computer joins the network.

for bonus points: be able to include a blacklist, so that some computers joining would not affect the torrents