It took a while to set things up correctly but with community help I finally managed it (here’s some information if needed: Communication between openwb and openhab via MQTT - how to set it up? - #7 by Joerg_Schreiner)
Once you know how it’s done, it’s quite simple, though: “you just need to configure the broker thing in OpenHAB with the IP-address of your openWB and port 1883”
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The bridge:
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The connection incl. channels from which items can be generated:
example of channel definition/configuration:
The state and command topics to use can be found here: MQTT - openWB Forum