Flipper Zero BT Serial Example App

UPDATE: this code might not working with the current version of FW because of API changes. WIP to update this repo.

This is a very simple Serial-over-Bluetooth app for Flipper Zero. You can use it (but better not to :D) as a reference app for building your own solutions.

What does it do?

This application hijacks the default Serial-over-Bluetooth connection of a Flipper Zero device (that is usually used for communication with mobile app) and set a custom callback on data received over the connection. Therefore, by modifying this app you can implement your own custom logic on using Serial connection over Bluetooth. As an example - see this repository: https://github.com/maybe-hello-world/flipper-bp

How to use?

0. Optional: enable debug log on the Flipper device: System - Log level - Debug
1. Compile and upload the app on the flipper.
2. Enable bluetooth and pair your device with the flipper.
3. Run the application on the flipper (optionally: connect flipper via usb and use fbt cli -> log to observe the logs)
4. On your device launch an app that supports serial profile over bluetooth (e.g., for Linux: bluetoothctl) and use these channels for connection:

tx: 19ed82ae-ed21-4c9d-4145-228e62fe0000
rx: 19ed82ae-ed21-4c9d-4145-228e61fe0000

Specifically, try to write into tx channel some bytes. 5. Observe bytes received on the Flipper's side.

How to modify it for my own app?

0. Optional: find a normal Flipper Bluetooth Serial reference app instead of this junk. If it's impossible - go to step 1.
1. The application substites the default serial callback of the Flipper RPC connection. In the fbs.c modify the bt_serial_event_callback function to introduce your own custom logic of processing the data received (or sent) over Bluetooth.

How to build?

See this official documentation on how to build external applications for Flipper Zero.