Firefly can read serial ports if the firmata is on an arduino.
But can python scripting in GH open and read a com port / UART data that’s streaming there directly?
Trying to channel real time data from this into GH: https://learn.adafruit.com/circuitpython-libraries-on-any-computer-with-mcp2221/uart
Other approach would be if the ghPython could read an excel data sheet (lunchbox) that’s being written to /added to by the device in external python program.