In the absence of an internet connection, such as when your area is disconnected, the app attempts to use Bluetooth to form a mesh network between nearby devices, provided that nearby people also have the app installed. When a person carries his phone through the effective area of the mesh network, the messages on the device will be synchronized to everyone, and the messages are in store-and-forward mode, so even if the original sender's phone is turned off or damaged, the messages will continue to spread.
Our app is currently the only app that can be authorized for use without connecting to any server. Considering that some users install the app on their own phones by extracting it from other people's phones, and there is no internet available, as long as he installs the app, from the first installation and opening of the app to each subsequent use, no network connection is required.
No need to insert a SIM card, no need to connect to WiFi, just turn on Bluetooth to use the app.
It should be noted here that location permissions are required for Bluetooth devices on devices below Android 12 to search for nearby Bluetooth devices, and do not actually obtain your location. You can rest assured.
Currently, text transmission is supported, and we will continue to adjust and gradually add image and voice transmission.
Please note that by default, the app will only search and connect to surrounding devices when you open it, but as long as you manually grant the permission to allow positioning in the permission settings of the app, you can unlock your phone without taking it out. In this case, it will automatically search and connect to surrounding devices in the background. We will enable this feature by default for the latest Android devices in subsequent updates.

After installing and opening the app, you will see a user created by default, which is the anonymous account created for you. If you need the ability to connect to surrounding devices, please open the settings page and fill in the Bluetooth address of your device. You can find this address on the Android device's Settings-About-Hardware Information page, such as 11:22:33:44:55:66, then return to the app settings page, long press the Bluetooth address input box, and enter the Bluetooth address you just found. Only by entering this address can you actively search for nearby devices and connect. Otherwise, you can only connect passively.

In order to ensure the best connectivity of the software and background communication capabilities, please grant as many permissions as possible one by one.
Our app does not have internet communication capabilities. Please rest assured that we will not send messages to any server on the internet through this app.

BTMeshChat