Create TAG for a Device that still doesn't exist

[Sergio Fernández]

Hi again, sorry for the inconveniences and all the questions I send.

I wanted to know if there's a way to create a TAG for a device that 
still doesn't exist. I ask this because I send a query like:

curl -i 'http://185.44.24.18:7557/devices/DEVICE-ID/tags/W300D' -X POST

And it answers with a 200 OK. But when I connect the router for the 
first time the TAG doesn't appear.
I wanted to know if there's some other way to do it, or if I am doing 
anything wrong.

Thank you.

- Sergio Fernández.