Multiplayer game over internet

[Rambutan]

I have my game (made in cocos2d) pretty much ready for putting in the networking but im very unsure of what to use. The game is realtime where 4 people in one lobby constantly need to send each other small amounts of data.

client -> server -> clients

What options are there?

Ive looked on cocoaasyncsocket at google code and my thought right now is to use this together with a socket server (UDP) programmed in python. The downside here is that i need to provide servers by myself. I would really like some kind of cloudservice.

I've also read a little about google app engine but im not very sure of what it is/how it works. Can i use this somehow?

Really appreciate some links or guidance! Anything works

[keeshux]

Is there a reason why you wouldn't use GameKit? It's very easy to use and provides Game Center matchmaking for free.