if the value is below a reference value for more than x hours, then do something. Hello I have a question to the forum how you would approach it. I have the measured value, which comes from mqtt, written into a flow.set and compare this every few seconds with the latest value, if this is below my…

If you need it to survive a restart then use the persistent storage feature which retains context variables over a restart. Every time you get a good value update a persistent flow value with the current time. When you get a bad value check the time against that flow variable and if greater than two…

I think this could all be done using a Trigger node. Think of the problem the other way round, feed only values above the threshold to the Trigger, set to send nothing then wait x hours, then send the error. With Extend selected it will restart the timer every time a good value is seen.

Ahh!! THX persistent storage feature that's something new for me, I'll have to ask aunt google for more information. I haven't worked with it yet. This seems to be exactly what I am looking for

[image] A guide to understanding 'Persistent Context' General This is something I wrote up after playing with the context options. I've filed a PR with some of this added to the Node-RED documentation but thought I'd release it here also. I hope people find it useful. Pau…

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If the value is below a reference value for more than x hours, then do something "fail-safe"

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Colin 30 July 2022 19:49 5

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If the value is below a reference value for more than x hours, then do something "fail-safe"

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