rs485: Add options to enable rtscts flowcontrol, add receive delay
Option -c enables flowcontrol with rts and cts, for none RS485 mode. Option -t adds a delay after the reception of the first byte, usable to test the flowcontrol.
Option -c enables flowcontrol with rts and cts, for none RS485 mode. Option -t adds a delay after the reception of the first byte, usable to test the flowcontrol.