Alternatives

1. Use use INDISERVER in command line mode only (NO EKOS/Kstars) - so just drives your devices (Astroberry will do this simply via Panels) - and run CCDCIEL/CDC on a remote Windows laptop. The latter will automatically download the files to your Laptop and control all the devices,plus includes Platesolving via a number of ways(you have to set up the Platesolving software - ASTAP,ANSNVR etc). Then use Astrotaoster (uses DSS) on your laptop to create/show real time stacked images.

OR

2. Do the "normal" Kstars/Ekos local set up and monitor via VNC but place your image folder in the Public area - if you are using Astroberry this automatically shares this area via Samba and you will be able to see the files from Windows. Then run Astrotoaster ,on your laptop, and use the inbuilt Rsync function to sync and monitor the image folder on the RPI. Platesolving would be done on the RPI,

You didn't say what your kit was so this is a "general" solution assuming No guiding just a Image camera and Mount. It also assumes you have a Windows device and are not an Apple person.

Live Image stacking ,IMHO, just does not work well on a RPI(any) as it needs resources (CPU etc) that the poor old RPI cannot provide and run everything else.

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