May I recommend the following tutorial - it should help you with the basics of getting Tasmota devices into openHAB via MQTT - there’s quite a few parts which need correctly configuring, and the tutorial goes into some depth to try and help.
May I recommend the following tutorial - it should help you with the basics of getting Tasmota devices into openHAB via MQTT - there’s quite a few parts which need correctly configuring, and the tutorial goes into some depth to try and help.