STM32duino / wiringPi gpio thermal printer filter for cups
Clockworkpi CPI-58 (grayscale)
serial:/dev/ttyACM0?baud=115200+bits=8+parity=none+flow=none
serial:/tmp/DEVTERM_PRINTER_IN?baud=115200+bits=8+parity=none+flow=none
sudo apt -y install libcups2-dev make sudo make install