Using AppWarp, developers can now add realtime communication in their Corona games and build real-time PvP, collaboration, chatroom etc type of applications. The great thing is that developers can do this without any server side code or socket level programming as all the communication is managed by AppWarp Lua SDK and the cloud servers. Also the base plan is free forever for Indies 
Please visit our corona dev center to learn more 
http://appwarp.shephertz.com/game-development-center/corona-game-developers-home/