My recent experience. Be carefull, I’m also a beginner :o)
– The parameter to change is “level”, which takes values between 0 (closed) and 99 (opened). Try a low value. You can create a scene to put roller shutter at this value.
– First, you have to calibrate the roller shutter (with “force calibrate” parameter). Be sure you added a line in a file to add this device, as explained Mika in this post.
If you need “always” the roller shutter 20 cm above, you can also set the limits directly with two screws in the engine, but it’s not an elegant solution.