Title: Register multiples wifi networks on OpenBSD
       Author: Solène
       Date: 05 August 2021
       Tags: openbsd
       Description: 
       
       # Introduction
       
       This is a short text to introduce you about an OpenBSD feature arrived
       in 2018 and that may not be known by everyone.  Wifi interfaces can
       have a list of network and their associated passphrase to automatically
       connect when network is known.
       
 (HTM) phessler@ hackathon report including wifi join feature
       
       # How to configure
       
       The relevant configuration information is in the ifconfig man page,
       look for "WIRELESS DEVICES" and check the "join" keyword.
       
 (HTM) OpenBSD ifconfig man page anchored on the join keyword
 (HTM) OpenBSD FAQ about wireless LAN
       
       Basically, in your /etc/hostname.if file (if being replaced by the
       interface name like iwm0, athn0 etc...), list every access point you
       know and their according password.
       
       ```configuration sample
       join android_hotspot wpakey t00345Y4Y0U
       join my-home wpakey goodbyekitty
       join friends1 wpakey ilikeb33r5
       join favorite-bar-hotspot
       ```
       
       This will make the wifi interface to try to connect to the first
       declared network in the file if multiples access points are available. 
       You can temporarily remove a hotspot from the list using "ifconfig iwm0
       -join android_hotspot" if you don't want to connect to it.