Great to hear that things are moving forward for you on this project.
It's been awhile since I have update the code and my memory is not as good as it use to be.
The file for the Arduino code is part of the master downloaded from here:
there is a download button on the right side of the page.
If you have updated the BB from the Master you should have these files on the BB.
But you can also download the master to your laptop, to a folder of your choice then point to it from the cockpit.
One item to try on the software that *might* increase the odds of success:
try changing the :
change the atmega328.upload.speed=57600 to 115200
Also, you can get more detail by editing "
and changing the end of the file by adding the -vvv option as:
'-U', 'flash:w:%s:i' % self.e['hex_path'],