Trigger rule on empty MQTT message?

  • Hardware Contributor

    Is anyone aware of any way at all to trigger a rule to execute if openHAB receives a blank message via MQTT?

    At the moment the below code works but only if the message contained a value, i need it to trigger if the message is blank.

    rule "solve"
                    Item monitor1 received update

    I have a open question on the openHAB forum but wondered if anyone around here has done something similar?

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