I used example on TTN (https://www.thethingsnetwork.org/docs/applications/python/) to build a python SDK to send and receive message. I have successfully received uplink message and stored them. However, I had no idea about how to use codes in this website (https://www.thethingsnetwork.org/docs/applications/python/api-reference.html#send) especially the code following:
In addition, do I need this code to set? And how to use this?