If i understand correctly these BLE modes, to have the arduino "listen" for an ibeacon ( or similar) then you need a ble module capable of being set to "central" profile. Something like this should do this http://redbearlab.com/blemini/ but any module with the CC2540 chip should work... im going to try some modules using this chip. Did u seem my post here http://forum.mysensors.org/topic/709/indoor-ble-location-or-presence-detection