How to move WiFi-Access from one Device to another?

[Custello]

I want to write a small bash script which can be used to auto-configure all my Ubuntu Touch devices after resets to factory defaults. In this case I want to move the WiFi-passwords onto the devices, so that I do not have to type them in manually via keyboard all the time.

I thought it would be enough to just copy the file /etc/NetworkManager/system-connections/<wifi-name> from one device to another.

Unfortunately this is not sufficient, something seems to be missing. Do I need more files?