How to receive messages in "downlink" from TTN to LoRa node (RAK811 LPWAN Breakout Module + NodeMCU ESP8266)

hi!
I am sending data from a humidity sensor and the status of a motorized valve from Node (RAK811 Breakout Module) -Gateway (RAK7243C) -TTN-Ubidots. But I can’t get the data sent from TTN to LoRa node. I have tried using the examples from the TTN library
and “RAK811.h” for Arduino. I can’t find a way to receive the data frame in the node, I have tried a function from the TTN library (DHT11) but the node never receives anything. Could someone help me with an example of how to receive the data in the node from TTN?

Cross-posting alert on RAK forum.

Answer in progress over there as more appropriate place.

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