Downlink Issue on Chipstack

I am using Dragino LoRa Shield V1.4 for connect chirpstack server. I can upload the data from Dragino Lora Node to chirpstack but unable to do downlink. Can you please share the Arduino code for help this issue. I want to control my Node LEDs using downlink commands from chirpstack server. Hope you understand my issue. Please help me

\Regards
Manoj G Ramachandran

Which LoRaWAN library are you using?
Can try RadioLib.

Hi Datnus,Thank you for your reply, I am using IBM LMIC Library. Let try on RadioLib.

Regards
Manoj G Ramachandran

Hi Datnus
I am trying to use Radio Lib instead of IBM LMIC Library. But my node is not communicate after I change the Library. Any another way you know please

Regards
Manoj G Ramachandran