Allow configuration of port flow control using udev tag
Add ID_MM_TTY_FLOW_CONTROL udev tag to allow changing the default flow control for a specific port. The allowed values are "rtscts", "xonxoff", and "none"-
Example of udev rule using this:
KERNEL=="ttyS1", ENV{ID_MM_TTY_FLOW_CONTROL}="rtscts"
Edited by Alfonso Sanchez-Beato