Hi Tom, So there was no such file. I created it using sudo -s and here is what I put in it:
# Arduino Uno Rolloffino Roof controller roofCtrl. Shown as Arduino SA - Arduino Uno. SUBSYSTEMS=="usb", ATTRS{idVendor}=="2341", ATTRS{idProduct}=="0043", MODE="0666", SYMLINK+="roofCtrl" # Arduino Nano weather/met station controller. - Shown as QinHeng Electronics CH340 serial converter SUBSYSTEMS=="usb", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", MODE="0666", SYMLINK+="metCtrl"
99-observatory.rules