@Torgeir_Rimeslatten Also realize that Smarthings is a full home automation hub that “competes” with OpenHAB. All you really need is a USB stick like - https://aeotec.com/z-wave-usb-stick
Even Z-Way is meant to work as much as a standalone system. I actually tested it here recently to switch off my Aeotec but decided the ability to pull the Aeotec off my RPi and walk it to devices was worth the lack of clean form factor. Plus I was having some range issues with the Z-Way but that just might have been my house.
Here is a discussion of a combo device if you decided you wanted to go the combined ZWave/ZigBee route -