SocketChat is a messaging app that helps you communicate with your friends on the same network, where one of the devices with this app installed acts as server. Just make a session and enjoy talking to your friends.

The app does not use any third party database to store your chat, its all saved in a local database and you can delete any session whenever you want.

You can customize the app however you want:

change chat bubble appearance
connection history
continue chatting in any network
server authentication

This app is all you need when it comes to local network text chatting.