Hi,
yesterday I was playing around with the Focuser Simulator and I get failures when I Focus In with Relative Position by the INDI Control Panel.
When I Focus Out or when I use EKOS everything works fine. Attached the LOG for such an action.
In the mean time I found that the failure can be fixed by an explicit casting in line 329 of the simulator source code (focus_simulator.cpp).
Attached an image of the fixed code.