OpenHAB3 MQTT Configuration with Text Files on Windows 10

Setup, Configuration and Use Migration
21

Thanks. I implemented

    val apples = getActions("mqtt","mqtt:systemBroker:some-mqtt-broker")
   .apples.publishMQTT("Some/Topic", "SomePayload")

in both rules and the OH3 errors. OH3 does not like the decimal before apples.
Is the getActions a time hog? I trigger the 2nd rule every 10 seconds.

I checked the addons.cfg' file. No UI is listed ui = but I still get the message. When I fired the system up for the 1st time I did haveclassic` listed. Does OH3 remember (persist) despite numerous computer reboots since then?

I tried the

myString.postUpdate("my message string.....")

method before receiving your message and learned the hard way it doesn’t work.

I also tried

mqttActions.publishMQTT("Some/Topic", myString.state)
and 
mqttActions.publishMQTT("Some/Topic", myString.state.toString)
and
and mqttActions.publishMQTT("Some/Topic", myString.state.toString, "true" )

and both fail. And I don’t understand what the true retention does?

Do you see what I overlooked?