Send data from chirpstack to heltec ESP32 [lorawan]

I have an ESP32 V3 node from Heltec. I have already configured it, using lorawan, with chirpstack and it can successfully connect and send data to the gateway also from several miles away. However now I would like to send data from the chirpstack connected gateway to the Heltec node. I have no clue where to start as chirpstack seems, on the surface, made only to receive data from the node. Can anybody help me? My main questions are:

-How to modify the .ino of the node to display received data on the OLED?
-Which commands should I send to chripstack to send data to the node (i.e. is there a specific MQTT message)?

Hello, if you want to send downlinkdata, perhaps you can try Snapemu to achieve it. This docunment may be helpful to you.

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