"agent-circuit-id" in HotSpot Login Page

Hi,

I want to get “agent-circuit-id” variable in my HotSpot Login Page.

For instance, I can get “MAC” variable like below:

...
<input type="hidden" name="mac" value="$(mac)">
...

but I can’t access “agent-circuit-id”:
MikroTik.png
How can I do this?

Thank you in Advance.