How to add a local multiplayer feature in a game with bluetooth?

I have developed a turn based game with Android Studio. I want to add a local multiplayer feature. You do not need a detailed explanation, a little idea would be very useful.

I saw the code of the bluetooth chat application. In that code, only two devices can communicate with each other. But my game must be played with four players and I can not find a way to connect and communicate between four devices.