When a smart phone, specifically an iPhone, connects to a server through an app, what information, if any, is available to the server?
Just in case knowing the scenario helps answer my question:
There is an iPhone app that allows the user to enter an IP address and port number from which the app receives a data feed. I would like to provide users of this app with a feed available by subscription. Because I have no control over the app, I cannot send any additional information to the server, but I do need a way to identify that the phone has a subscription to my feed.
Thanks in advance for any help.