I searched a bit on the forum and found this older post:
So apparently, this was already possible on v2, I only found about it now. Setting attributes is only accessible through ttnctl, not the console web interface.
Now with v3, I noticed the text in the v3 console “Attributes can be used to set arbitrary information about the entity, to be used by scripts, or simply for your own organization.” However I have no idea how to actually use it in a script. I’m not seeing it in the v3 MQTT uplink message right now. In a way, I think, it’s not so different from other metadata, like the WGS84 position which is sent with the uplink message.
@descartes what kind of API feed could I use for this?