Bump up

Any idea? The only suggestion I can find around is about launching "indiserver", but as I wrote I get an error message.

I feel like it should be something pretty easy for an experienced user or developer (like the ones in this forum) to help with, even with just a link to a guide (maybe I'm not reading the right tutorials).

Thanks in advance for your time

if you are using eqmod maybe you haven't installed the eqmod driver (which doesn't come with libindi as it lives in the 3rd party drivers)

If you get messages about launching drivers, indiserver is (most likely) running. If in the profile editor the Mode: is 'Local', EKOS will launch it. Verify this (from a console/terminal) using 'ps aux | grep indiserver'.
So it means it cannot talk to the mount controller.
I don't have an EQ6, only an Vixen GP-DX with EQ3/5 upgrade kit. For that one I either need the synscan driver to go via the hand controller, or an EQDIR cable that connects to the port where usually the hand controller is plugged in.
You mention the mount has a serial port. Are you sure you need the EQDIR and not just a simple USB-to-serial converter?