The battery and current time service I think is inherent to the iPhone, not necessarily whatever software is running. I've seen that a lot when doing totally unrelated BLE/iBeacon stuff. A... clever combination of CoreBluetooth and iBeacon is used for discovery, messaging is actually handled via data connection. We toyed with some ways to transfer data directly (multipeer and decidedly-not-multipeer), but we haven't used those in this release.