reverse engineer IOS Gamekit session messages
===

I want to write a third party Iphone app that can receive messages from a peer to peer
GameKitSession.

Is it possible to reverse engineer peer to peer messages when you have the sessionId? 
I have tried Wifi sniffing, but cannot see any data transmitted
from the controlling iphone app. I have written an test App the can connect as a client using
the sessionId but only receive events on PeerChanged but nothing on ReceiveData.

Any Ideas on reverseEngineering it?

thanks