Yes, that part could have been explained a little better, but it seems fairly clear that the person is developing a chat app to run on a local area network. The

Yes, that part could have been explained a little better, but it seems fairly clear that the person is developing a chat app to run on a local area network. There are a couple ways to do that. One is bluetooth, which has a very limited range. Another is radio signals, which I've never heard of anyone using in an iPhone app (but then again, I don't know much). Another is Wifi direct, which I've heard is very insecure, but again I don't know. It has the advantage of not requiring a central router/server. Would someone who knows more than me care to flesh out any of these points, since I clearly don't have much information and would like to know more?