I just bought and installed a Sesto Senso 2 focuser.

It works via USB and its built-in Wifi. I had reset it and re-calibrated it on my scope from scratch with the WiFi and the browser based GUI.

When connecting the device to a RPi with a USB cable and running EKOS, it seems the SS2 is being detected, but EKOS cannot read or interpret the absolute position of the focuser:
... Sesto Senso 2 @ 192.168.68.55: [WARNING] Failed to process position response: _STEP80933 (10 bytes)

The value 80933 is the absolute position... but it is not transferred to the driver.

Any idea what is going on? I have INDI 1.9.7 installed.
Driver Info yields:
Name: Sesto Senso 2
Exec: indi_sestosenso2_focus
Version 0.7
Interface: 8

Update its firmware and update INDI to v2.0.3

Thank you for your quick reply.

The FW has been up to date.

INDI is running on the Avalon StarGO2 computer and controlling the proprietary drivers from the M-UNO mount. A full INDI update might break that link …

Is there a way to just update the sestosenso2_focus driver?

OK. I tried to give the updating/upgrading a shot.

I made a full backup (image) of the SD card and then I tried to run the following commands... several times including rebooting.
The system is not updating to indi 2.0.x... it seems to be stuck on 1.9.7.

Right, they're apparently using Astroberry repo and I guess that's still on 1.9.7

I followed this guide, which seems to be based on AstroBerry:
INDI installation on Raspberry Pi

That makes sense. Is there another repo I could try, like Stellarmate?

How would I install the StellarMate INDI drivers repo on the StarGO2? Or is that too risky?

I do have an extra RPi4B and a StellarMate account. I will give this a try again. At the time, when I bought StellarMate, the communication with the StarGO2 was not very stable. I will need to try this again.

You could build from sources using the scripts from gitea.nouspiro.space/nou/astro-soft-build
It's pretty much click and play (see the README at the above) but building on a PI4 8GB does take a couple of hours.

Thank you for the link! I might just do that!

Well, isn't there an easy way just to compile the new driver files (*.h, *cpp) of the focuser under 1.9.7....

OK... rather than trying to compile everything from scratch, I tried first with StellarMate, latest version after letting itself update last night.

StellarMate finds the Sesto Sense 2 focuser, but whenever I click on the imaging loop button, not auto-focussing yet, the motor just goes off and I could not stop it.This actually happened when turning the loop OFF... Why would the motor even start to move when clicking the loop button (the one with the two curved arrows that changes into a box).

Autofocussing did not work either. It goes all over the place but did not find focus... even when being in focus at the start of the routine, I wanted SM to do the fine tuning... Again it goes everywhere takes lots of images, but not finding focus.

I tried different setting in the process and mechanics to no avail.

If you selected "Polynomial" algorithm, is it any better? What's the step size? select a large step size (500 or 1000)

Unfortunately not.

I also played with different step sizes.

The main issue was that the motor started going off without stopping, when I pressed the stop button on the imaging loop. I think that should not have happened.

I was also connected to the focuser with the iPad via the wifi link for monitoring the position. Maybe that was the problem.