BBB WiFi Client
To be a WiFi client, you'll need the following files installed:
- /etc/network/interfaces.client (overwrite '/etc/network/interfaces' with this file)
- /etc/wpa supplicant/wpa supplicant.conf
You'll need the 'wpa_supplicant' package installed, but that comes installed by default (IIRC).
'hostapd' must not be running, so if you're using AP mode, make sure this is stopped (see BBB WiFi Client/AP Switcher for scripts and details)