I'm new to Node-Red and I don't know if that's possible without some storage (SQL database for example). So, I have an MQTT endpoint that pushes numeric value when update made. For example - message.payload = 799. How to on every new message compare this new value with the previous one (the one t…

ukmoose 21 February 2019 10:47 2

Have you read the section on context variables in the docs?

And then read this thread in the FAQ section Store a value in a function

2 Likes

Topic		Replies	Views
Store a value and compare it with previous value General	11	9802	29 June 2020
How to compare consecutive payloads in node-red? General	4	917	29 August 2018
Compare two payloads General function-node	6	1734	25 October 2022
Storing Previous Value of msg.payload General	5	2893	1 November 2020
Knot following? General	6	1024	4 June 2020

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Node-Red compare new and previous values

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