Determine whether XBOX 360 is on

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http://unix.stackexchange.com – I want to determine in close to real-time (up to 5s lag would be OK) when my XBOX 360 is switched on or off over the network. The XBOX gets a static IP address which I know. However the XBOX seems to be very much like a black hole in that it does not respond to pings and seems to have no ports open all the time (TCP 1029 is open when in XBOX Home, but not when actually playing a game). What other ways could there be to find out whether the XBOX is online? (HowTos)