I followed your suggestion and installed PostMan. I installed your collection as well. thanks for that.
I setup my globals with my IP and PORT, then executed the devices sample from your collection.
the result is shown in the attached screenshot but the important part is:
“error”: “Not authenticated”,
both the MacBook running PostMan and the Pi are on the same LAN (192.168.1.x)
additional troubleshooting / debugging suggestions appreciated.