There are many guides, and libraries available to make HTTP communication between iOS apps/servers easier. I’ve found an excellent step-by-step tutorial that demonstrates how to use NSStream and CSStream to communicate from within your iOS apps to a TCP server.
The tutorial is from Cesare Rocchi and also demonstrates the basics of creating a custom TCP server using Python, and the Twisted networking engine along with how to make a simple interface for the client in Cocoa Touch..
You can find the tutorial here:
How To Create A Socket Based iPhone App And Server
You can read more about the Twisted networking engine on their offical site here:
Overall this is a great tutorial that guides you with detail through every step.
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