I used to test the module with iphone4sbledemo and keyfob sample coming with BLESstack 1.1a. The iphone4s was using iOS5.0.1 and it seems that the keyfob could connect with iphone. Then I updated the iphone with iOS5.1. When I press the "connect" button of the demo, I can see that the BT icon became blue and then grey again. If I setup breakpoint in keyfob application, I can see that the connection has been established. But I don't know why iphone dropped the connection immediately.
Then I tried to load the keyfob hex file coming with BLEStack 1.2 and it works fine. Does anybody know why this is happening?