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The README manual does not explain how one can turn the hotspot off again (And I'm too stupid too understand the code). Currently I am just restarting my pi.

GPIO.22 is set to OUT, and it controls the state of the big blueish LED under the element14 logo: 0 apparently means on, and 1 means blink (try it!)

Given this, I would not be surprised if there were other issues with the documentation, too.

from README.md

When using Wifi configure Wifi settings via Ansible

if you create a valid wpa_supplicant.conf file and place in your boot partition the pi copies it over using stock rPi images (seems to now include lite)

the file disappears after it copies but activates network on first boot so you just have to ensure ssh service is enabled to use WiFi