wifi
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`Wifi security <https://www.wi-fi.org/discover-wi-fi/security>`_


overview
============

`Wild Wireless <http://ilta.personifycloud.com/webfiles/productfiles/914126/ETPG2.pdf>`_


sta: client

ap: access point

akm : Authentication and Key Management

bss: Basic service set

ess : Extended service set 

802.11u
==========================================================

`Understanding Hotspot Profiles <https://www.arubanetworks.com/techdocs/Instant_40_Mobile/Advanced/Content/UG_files/Hotspot_profiles/HotspotProfileOverview.htm>`_

gas: Generic Advertisement Service

anqp: Access Network Query Protocol

gas & anqp 用于network discovery and selection