AutoLAN

AutoLAN is now free for everyone to use and learn from! If you want to get started in local networking here is the place to start!

AutoLAN is a library for Corona SDK library that allows you to create a new multiplayer game or networking application!
AutoLAN uses the a robust client server based networking model and is built on top of the high speed UDP transport layer. Connecting device A to device B is as simple as 5 lines of code and clicking a connect button! Automatic network discovery makes it simple for your end user and more sales for you!

Please see the product page for more information:
http://www.mydevelopersgames.com/AutoLAN/