Darwin/OSX Bluetooth code

Dear Hackers,

Does anyone know if Apple has released Darwin/OSX Bluetooth code to the
public? Quick look at http://www.opensource.apple.com/ did not reveal
anything particularly useful (although i did not try really hard :)

I'm currently thinking about un-Netgraph'ing FreeBSD code to make it portable
to other BSD style systems. I'm trying to look at other implementations
and learn as much as i can. In particular i'm trying to figure out how to 
minimize OS dependent code and what is the right abstractions levels.

thanks,
max

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