use Jelly Bean's Simple Secure Pairing ( Bluetooth )
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as of #io2012 and this doc http://www.android.com/about/jelly-bean/ there is now a way to pair BT-devices via NFC. That sounds really nice, but I do not find documentation about that. I am especially interested to know if that works with SPP modules that do not support SDP - can I simply write some NFC tag with the PIN-Info and the device gets paired? Would help a lot as a lot of users have problems with the PIN-Pairing Process ..