I've looked into something like this before but the problem is that you need root permissions to attach to the bluetooth stack as far as I understand. Some developers (reader42) had a moving map application for gps almost finished but reached a dead end when they learned that they can't connect to the bluetooth GPS device because of a "permission" problem. (1)
So unless you have root access to your device I would doubt that you can solve your task. Of course there is always the possibility of JTAG. But then you need to write far more than just your own application.
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references:
1)
http://translate.google.com/translat...hp%3Ft%3D99627