Trouble getting booleans from "rpi-gpio in" node

I'm trying to get the 0 value that is coming from the GPIO pin 40, but when I print the payload it shows some numbers, not a boolean output such as the documentation says

The numbers are the timestamp you are injecting.

The gpio will send a message when it changes state. Try switching the physical input on/off.

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Thanks dude, the documentation wasn't so clear, since I'm using it to recive data from a analog sensor through Arduino I wasnt able to change the inputs, but with some functions it worked

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