I am developing a C program using POSIX (so it also runs in Linux) to open the serial port and write data to it. I am having a heck of a problem trying to figure out what exactly is going on. My OSX version is is 10.9, Arduino version is 1.0.5 and my Arduino hardware is a Mega 2560 R3. If I open th…

OSX POSIX open() does not work until Arduino serial monitor is started

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