Hello, Potto,
yes, the solution is completely outside of kstars, as you can see in the blog I connected the remote trigger contact of the 5d directly to a GPIO of the Raspi via cable and controlled it with the code (in the blog). To control it directly from the Raspi you need a resistor and a transistor, so it's not that easy.
take a look at that site:
www.staff.uni-mainz.de/naethboh/raspberry.html
Greetings
Matthias

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