How can i change the led colour by the true or false payload message?
Your payload seems to be an array
payload: [true]
whereas it needs to be a boolean
payload: true
How to put it as boolean?
If you could be confident that the value you want is the first element of the array, you could use a change node:
I have no knowledge of the FINS Read Multiple node, but looking at the name, I'd guess it might sometimes return an array with multiple elements. That's why I didn't make a suggestion in my first answer.
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