It's been a long road to getting the Dropbear V2 designed and test, but everything is now ready to go!
Buy Dropbear V2: https://speeduino.com/shop/speeduino-boards/44-dropbear-v2.html
Manual: https://wiki.speeduino.com/en/boards/Dropbear
Teensy 4.1 testing: https://www.youtube.com/watch?v=xgNpUEs6CWE