I am communicating with the arduino via firmata through an external program, where I am setting the serial port name by hand. Everytime my mac renames the serial port, my program can no longer find the arduino.
The more difficult method would be to write something that detects serial ports like the arduino IDE and then leave some instructions for the attendant like "when starting the program each day, be sure to choose the serial port that titled 'usbmodemxxxx'" and hope that they get it right. But that just seems like such a recipe for disaster...
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