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Activate LED on publish to topic

Hi, Ive got my esp32 NodeMCU up and running with MOS, connected to AWS, and it subscribes and publishes no problem. Im now looking for a tutorial to guide me on how to turn on a simple LED on when I publish to a topic via AWS (or any MQTT service).

The Mongoose OS tutorials on youtube are great, and many thanks for making them. But they reference non existing API references on your website so I cant find the sample code that goes along with the references.

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