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Trigger rule on empty MQTT message?

Samuel235 Hardware Contributor last edited by
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"
        when
                Item monitor1 received update
        then
                V_VAR1send.postUpdate(V_VAR1.state)
end
```
I have a open question on the openHAB forum but wondered if anyone around here has done something similar?
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To add another option to this thread. I have not yet used them but I am collecting these. They look like they are made for these types of sensors
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@ncollins Great! Seem the problem is the delay. With 1 ms or 100 ms I have double message, but with 200 ms I only one message. Thanks a lot.
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@chrishiscox said in OH3 Serial Gateway Problem: I tried and tried with my serial gateway, and never got it to function porperly. The serial port was working I could see it and data, but OH3 just refused to recognise the data. After a week, I decided to abandon the serial and flashed a esp8266 attached the nRF to it and bobs my uncle as we say. It goes via MQTT, so takes a little more settting up but works fine. If you want more info I will dig out the pages I used to make it work. Hmmm, the pi OH is running on already has an active MQTT broker. So you got me thinking: Wouldn't it be possible to use the MQTT gateway instead of the serial gateway? It should be able to translate radio messages (Hope RF69 in my case) to mqtt messages which are already recognized by OH. I'll have to find a spare pi and try it.
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