my MQTT source can produce packets at a random intervals.
I have no need for fast logging.
Is it possible to make node-red provide this logic?
at 10:10 , 10:20, 10:30 a certain payload object arrives, but only at 00minutes (once a hour) the last packet is forwarded to next step. so that at 11:00 - the payload from 10:30 is processed. (payload from 10:10 is overwritten by 10:20 , 10:20 payload os overwritten by 10:30 payload, which is let thru at 11:00)
You can use a change node to store the value in flow or global context and then use an inject node to (at the desired time), grab the value from context & and use it as desired.
limited to two pictures, so here is the rest:
But the output is not as expected: I the debug shows me:
I expected the msg.payload to look something like this { "battery": 57, "humidity": 52.37, "humidity": 52.31, "linkquality": 45, "power_outage_count": 9, "pressure": 997.3, "temperature": 4.08, "pressure": 997.4, "temperature": 4.14, "voltage": 2935 }
What am I doing wrong?
The issue is you set global.last but then restore global.payload!
Use the context viewer on the right hand side bar to see what is stored where.
Ouch - that was embarrassing.
Thank you. -also for teaching me about the context viewer.
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