It comes with iwmon, a monitoring tool for nl80211* messages, which I just tried out and it's really cool.
Now just figure out what all these messages mean... :o

(*nl80211 = netlink for 802.11 /WiFi. Netlink is a protocol to exchange information on a local operationg system between its kernel and user space.
For example, in nl80211, there are "Scan Request" messages where some application asks your driver to scan for available networks. Then the driver reports the results back in a "Scan Results" message. You can see both in iwmon, but also through tools, like with "iw dev wlan0 scan" on the command line.)