* FX.25 (AX.25 with error correction) coder/decoder, fully compatible with [Direwolf](https://github.com/wb2osz/direwolf) and [UZ7HO Soundmodem](http://uz7.ho.ua/packetradio.htm)
* Digipeater: 4 settable n-N aliases, 4 simple aliases, viscous delay (known from aprx) or direct only, black and white list
Since version 2.0.0 the component values have changed to provide support for faster modulations (9600 Bd). If you want to use these some components must be replaced. For more informations refer to the [manual](doc/manual.md) ([polska wersja](doc/manual_pl.md)).
The firmware was written using System Workbench for STM32 (SW4STM32) and you should be able to import this repository directly to the IDE. You can get the source code using:
```bash
git clone https://github.com/sq8vps/vp-digi.git
```
Since version 2.0.0 you will also need to get appropriate submodule ([LwFEC](https://github.com/sq8vps/lwfec) for Reed-Solomon FEC):
```bash
git submodule init
git submodule update
```
Since version 2.0.0 there is also a possibility to build the firmware with or without FX.25 protocol support. The ```ENABLE_FX25``` symbol must be defined to enable FX.25 support. On SW4STM32 (and STM32CubeIDE probably) this can be done under *Project->Properties->C/C++ Build->Settings->Preprocessor->Defined symbols*.
The project took a lot of time to finish, but now it's probably the most effective, publicly available, STM32-based modem and the most customizable microcontroller-based APRS digipeater. I would like to mention some resources I found really useful or inspiring:
