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Allow configuration of port flow control using udev tag

Alfonso Sanchez-Beato requested to merge alfonsosanchezbeato/ModemManager:rts-cts-udev-tag into master

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

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