Maybe the existing algorithm could be made working correctly if we introduce a backlash on every turnaraound, which might be adjustable. For my tamron the backlash would be 8 medium steps.

Today my lense does not move at all no matter what I do. It won't focus neither with or without LiveView activated. I'm unsure whether or not this is a user error.

Try to enable view finder mode in the action panel of the indi dirver and select an item from the far3...near3 drop down menu (no matter which item you choose). This worked for me.

Nope, sorry. Have there been any changes to the driver lately? It did work recently, albeit moving the mirror 80x up and down. No click-clack today at all.

I didn‘t upgrade today ...

Then don't do it.

I tried gphoto2 --shell commands and these do work. So my cam is OK. Are there any other camera settings that might prevent focusing from doing its job? Who knows, maybe I have changed some inadvertently.

Now focusing via Indi panel works again but the autofocus routine in Ekos won't move the lense at all. I can hear the mirror does not go up (other than for taking pictures) so it appears to me LiveView mode isn't activated at any time. Lots of pictures are being taken but they are all the same.

Awesome data Christian! Ok, so I might either have to adjust t he Ekos autofocus algorithm, or make one special for DSLRs. I need to examine the data and see how it can accommodate that.

Will investigate this more once I get the artificial star.

Herrhausen, I would like to help, but I am afraid I don‘t know any new advice. When I experienced the autofocus routine wouldn‘t move the lense, I could solve this by manually enableing the view finder mode in indi AND select an arbitrary focus move from the drop down menu on the same panel.
I noticed that after a live view window is closed, view finder mode is being disabled. In the inidi panel it remains checked as enabled, though. Then I had to re-enable viewfinder mode by unchecking and rechecking it in the indi panel.

Thank you, Jasem. I am looking forward to that.

chengel, that's exactly what I do. In Indi it works as expected. In Ekos though LiveView is not being activated and the lens does not move. Maybe you should update to find out whether the difference in behaviour stems from the fact that the canon drivers and/or Ekos versions we use are not the same.