If you're trying to talk over a serial port in #linux odds are you'll run into a permission error. A lot of guides will tell you that you need to add yourself to dialout to access the serial port. I imagine this worked well in the past but today there are many ways to use a serial port and many device groups. Instead use the command stat /dev/whatever to find out exactly what group the port you're trying to access is in. #HowTo #IWishIKnew