The intent of this library is to foster experimentation with e.g. automated beacons. For example, FT8 supports free-text messages and raw telemetry data (71 bits).
The encoding process is relatively light on resources, and an Arduino should be perfectly capable of running this code.
Decoding is is still work in progress. So far a 15-second WAV file can be decoded on a desktop machine or SBC, and the routines are somewhat ready for a fast microcontroller, perhaps with some tradeoffs. One definite limitation is the necessity to store the whole 15-second window in some representation (either waveform or DFT spectrum) for decoding at the end of the time slot. The current implementation uses about 200 KB of RAM for that purpose.
I'm currently working on decoding, which still needs refactoring. The code is not yet really a library, rather a collection of routines and example code.
You can generate 15-second WAV files with your own messages as a proof of concept or for testing purposes. They can either be played back or opened directly from WSJT-X. To do that, run ```make``` and build ```gen_ft8```. Then run it. Currently messages are modulated at 1000-1050 Hz.
Thanks to Robert Morris, AB1HL, whose Python code (https://github.com/rtmrtmrtmrtm/weakmon) inspired this and helped to test various parts of the code.
This would not of course be possible without the original WSJT-X code, which is mostly written in Fortran (http://physics.princeton.edu/pulsar/K1JT/wsjtx.html). I believe that is the only 'documentation' of the FT8 protocol available, and the source code was used as such in this project.
