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I have a USB CDC ACM device which appears in the /dev filesystem as /dev/tty.usbmodem... and /dev/cu.usbmodem... . Most of the time, I am able to read from and write to this device using serial port libraries, including the POSIX calls open(), read(), write(), etc.   However, if the device is plugged in, then my mac goes to sleep for at least a… (Show more)
in Drivers and Device Access