Setting default wallpaper with a script

[Antony Loebs]

So I've continued to play around with scripting the default Plasma desktop
(with JavaScript) and have a quick question: how can I set the wallpaper? I
tried the following
---
var activity = new Activity("desktop");
activity.currentConfigGroup = new Array("Wallpaper");
activity.writeConfig("wallpaper",
"/usr/share/wallpapers/Default_wallpaper/");
---
but with no joy.

Thanks in advance!
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