Aeons Blue Chat (free)

Aeon's Blue Chat is a simple Bluetooth chat to exchange public or private text messages between users via Bluetooth. Internet or WLAN is not required, but participating devices need to have this app installed.

Create your own network by connecting as many devices as you want (up to seven connections per device). To connect to a certain device tap on it in the device list. If the desired device runs this app as well then the group chat screen will open up.

To send private messages to another user just click on a message from the desired in the group chat user to open up a private chat screen.

Flip through the chat screens (left/right) to pick a certain chat or the list of available devices.

Use the menu (Settings->Communication option "routing in background") to enable this app running in background if you still want to receive or forward messages from your friends after closing this app.

A few devices may have trouble to pair properly. This app adds a Bluetooth profile for chats that's not known to devices that are already paired. To avoid this issue the following steps are recommended:
1 - start the app
2 - open menu->Settings->Communication and enable "routing in background"
3 - close app
4 - open the systems Bluetooth settings
5 - unpair the device you have trouble with
6 - repeat the steps mentioned above on other devices you want to chat with
7 - re-pair desired devices

Thank you for using this app.