Ok, go through this:
And then: MQTT Things and Channels - Bindings | openHAB and https://www.openhab.org/addons/bindings/mqtt.generic/ for more details on how to set-up mqtt with OH
Also, this might help:
and:
When you get to the stage of sending RF commands to the tasmota from OH then we’ll go though the rule that you need for the delay that you mentioned in your first post