tty0uart: Null-modem emulator connecting virtual tty to virtual UART
/dev/ttyhk0 <--> /dev/ttyHK0
Various programs can detect /dev/ttyHK0 but usually not /dev/ttyhk0.
git clone https://github.com/hhk7734/tty0uart.git
cd tty0uart
make &&
sudo make install
cd tty0uart
sudo make uninstall