Hi Micheal,
Assuming you are using our AT command code, the payload of the down link packet will be output on the main serial port… not the debug port.
I’m not sure if this might work for you but in our AT command code, the +PING command displays the RSSI and SNR that the gateway sees from the mDot in up link packets. The +RSSI and +SNR commands display the RSSI and SNR as seen in down link packets.
Leon