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I have a native iPhone application in development which requires me to interact with a server that uses a stateful protocol over a persistent connection to transfer messages over the wire. This is definitely not a trivial application to write, even though the UI itself is very simple.
Stateful protocols and persistent connections are often interrelated, but not by design. My first problem was to divide the original problem in two: how to manage the persistent connection, and how to handle the underlying protocol so that the stateful aspects did not bubble up throughout the UI.
Topics: iPhone SDK, NSURLProtocol, Objective-C