Looking at this:
http://codeatuts.blogspot.com/2013/04/tutorial-28-codea-v152-objective-c-add.html?m=1
…it seems like the CodeaAddOn ability could fairly easily handle simple GameCenter communications.
I’ve done a fair amount with one-to-one Game Center multiplayer communication in native iOS, and while setting up a player connection and authentication and all that would still have to be written natively in Xcode, ultimately, once a match is made, there’s basically just a sendData(…) and a receiveData(…) function that would have to be hooked up via a CodeaAddOn.
Is there documentation on CodeaAddOn somewhere?