Nov 17 21:28:58 ferrari pppd[7101]: Serial connection established.
Nov 17 21:28:58 ferrari ifplugd.hotplug[7173]: Invoking ifplugd for ppp0
Nov 17 21:28:58 ferrari pppd[7101]: Using interface ppp0
Nov 17 21:28:58 ferrari pppd[7101]: Connect: ppp0 <--> /dev/ttyACM0
Nov 17 21:28:58 ferrari pppd[7101]: tcflush failed: Bad file descriptor
Nov 17 21:28:59 ferrari ifplugd.hotplug[7192]: Stopping ifplugd for ppp0
Nov 17 21:29:00 ferrari pppd[7101]: tcsetattr: Invalid argument (line 1010)
Nov 17 21:29:00 ferrari pppd[7101]: Exit.