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So I have an app that includes peer to peer chat, which is only between two users at a time. What I am doing now is upon the user typing a new message, it calls a PHP script which inserts the message into a mysql table. then every 5 seconds the code calls a php script which downloads all the messages. So there is a maximum 10 second gap between messages. So my question is if there is a better way to do peer to peer chat.
You can use the server as a matchmaker – use it only to find the other phone. You provide the IP address so that one phone can contact the other phone and initiate a connection. One of the phones act as a chat server.
You can read about sockets programming with Cocoa for example here: http://cocoawithlove.com/2009/07/simple-extensible-http-server-in-cocoa.html