AapoTahkola

Hack to do tmc2209 uart mode is at https://github.com/makerbase-mks/MKS-TinyBee/issues/6 You might loose some functionality on display and stuff. Has not been tested very much yet.

I promptly reflashed global firmware to make SIM900A SIM900. I had garbage on the io line until I changed circuit so that TX from esp32 goes to 5V RX on...