Hi, I've been struggling for some time now trying, to get my Onstep to work with Astroberry on a RPi 3B+. I've flashed and updated the latest version of Astroberry, and am running Onstep in the STM32 Blue Pill configuration. When connecting via /dev/ttyUSB0, I get the message '..Port /dev/ttyUSB0.is already used by another driver or process.' I've also been able to connect with WiFi--sort of, as EKOS can sometimes read the local RA/DEC, but nothing else happens. I've found other threads which allude to a problem that this version of the Onstep has using the CP2102 UART to TTL, but I've been unable to wind my way through the threads successfully to a solution (too many trial and error paths leading nowhere that I can follow).
Can someone please guide me through the fixes that I need to implement? I understand that it should be possible, but finding the help has been problematic.

I should note that my OnStep system runs just fine with ASCOM, supporting also PHD2 guiding and camera/mount control through APT on a creaky old PC laptop. I keep telling myself that if I can't get this INDI solution to work, then the RPi becomes either a garage door controller or a paperweight.

Thanks for any assistance

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