Some guy in Apeldoorn (the Netherlands) setup a multi-node Bluetooth tracker [1] around the city (in 4 locations for now). It looks kind of similar to what I did with the Bluetooth Location Tracker [2] a couple of years ago at the CCCamp. The interesting thing is that he puts the live data on the web including some cool statistics about the type, manufacturer and model of Bluetooth device.
Also this is a real cool project I have some problems with publishing the complete BD_ADDR (Bluetooth MAC addresses) with date time and position on the web.
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