Interface or file to find information about associated Device

Installing and Using OpenWrt
#1

I want to find the association time of the associated device connected to my OpenWRT installed router. Is there any possible way?

#2

Yes, via the System Log.

#3 
iw dev wlan0 station dump
#4

Thanks @vgaetera I had already used this command but I want to find the API that this command is using.

#5

The API is at the driver level. iw is one user-space tool that uses it. ubus is another.

Edit: See also