RAK831. how to show data from rak811 to RAK831 on rasberrypi

Gateways
1

hi all,
I have a RAK831 + Pi3 Lora gateway and RAK811 Lora node.
I don’t understand payload packet that rak811 send to rak831. when I send “00112233” to rak831, I received payload that I don’t know what the byte means.
screen start.sh and data on thethingsnetwork.
sh
arduino + rak811 shield code and code show json payload & p->payload.
code

2

the data is encrypted
please read some background here

https://www.thethingsnetwork.org/docs/network/security.html

3

how to decrypt payload and show data on the raspberry pi. Temporary I don’t need to send data to the server. I want to understand the process of sending data between RAK831 and RAK811

4

search for private server

5

thank you, I will learn more.