It stopped working for me after the stellarmate update.
Then I did the firmware update (hoping to fix it), but the calibration fails.
After a calibration with the primalucelab program (play under windows 10) the focuser moves without errors even in ekos (I dont' have tried the calibration under ekos after calibration under windows)
Rendering Error in layout Message/Item: array_keys(): Argument #1 ($array) must be of type array, null given. Please enable debug mode for more information.
Maybe a bit late but I ran into the same problem. Updated my Sesto Senso 2 firmware using the Primaluce Play software (on windows). Works well now on my Stellarmate and Indi drivers.