Hi Ken,
thank you for your reply. Building from source was also an approach I thought of but I didn't found the sources in github.com/indilib/indi (can aou tell me were the source is for the future?) and I'm also not so familiar with compiling.
But I found yesterday, that at least in Astroberry there is the driver "Astroberry relays" (github.com/rkaczorek/astroberry-diy) which is I think quite the same. The control of my relais worked with that :-)

I also use Stellarmate, but I didnt had the chance to check that in Stellarmate 1.6.1 (Kstars 3.5.6), as far as I remember, with the Stellarmate Version 1.6.0 (Kstars 3.5.5) it worked with the indi-rpi-gpio.

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