I’m bored tonight so I’m reading through the forums… I’ve already done the tutorial on this so I might as well share a link.
“Rollershutter” is not an option in the built in openhab homekit support. Closest option could be the [lighting] tag and call it a “dimmer”. I did it like this for a while.
But there’s a better way. I’ve been compiling the following thread about using a combo of openhab, nodered, and HomeKit. It’s a lot to read but there’s an example of rollershutter (curtain) in there which I use in my house. Have fun, feel free to add questions once you’ve read through if you struggle implementing for your setup, we might be able to help from there.