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Oops. Sorry, problem was user error. All working now. Too many look alike raspberry pis. Arduino plugged into the wrong Pi.

I have a new Z-Way install on a Raspbrry Pi 2 with a RaZberry daughter card and Buster Lite OS. Z-Way appears to work fine but a small existing app using a USB attached Arduino no longer works. The app says no Arduino is attached. Checking /dev, lsusb and usb-devices all show the arduino is not bein...