How to integrate with another OH Instance

Customization
2

Thank you for this tutorial @rlkoshak

I attach a modified tested version of Rules DSL, which is coherent with the naming above

rule "Send commands to HestiaPi"
when
    Item vHeating_Mode received command
then
    val mqttActions = getActions("mqtt","<broker Thing ID>") // replace <broker Thing ID with the Thing UID for your Broker Thing

    // Only publish the command if the new state is different from the message currently on the MQTT topic.
    // This will prevent loops.
    if(vHeating_Mode.state != vHeating_Mode_Stat.state) {
        mqttActions.publishMQTT("hestia/local/stat/heatingmode", receivedCommand.toString, true) // the last true makes the message retained
    }
    if(vHeating_Mode.state != vHeating_Mode_Cmnd.state)  {
        mqttActions.publishMQTT("hestia/local/cmnd/heatingmode", receivedCommand.toString, true)
    }
end

rule "Updates from HestiaPi"
when
    Item vHeating_Mode_Stat changed or
    Item vHeating_Mode_Cmnd changed
then
    // Only update the proxy if the change is different from the current proxy state. This helps
    // avoid loops.
    if(triggeringItem.state != vHeating_Mode.state)  vHeating_Mode.postUpdate(triggeringItem.state)
end
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