https://www.avrfreaks.net/forum/forbiden-tech-china-has-arrived?page=all
https://www.electrodragon.com/w/Logicgreen
it uses SWD for programming:
https://www.geek-workshop.com/thread-26461-1-1.html
https://github.com/wemos/Arduino_XI
https://github.com/LGTMCU/Larduino_HSP
