@gratizzz try this code. Update info where needed;

#!/bin/sh hex=`echo $1 | tr '[:lower:]' '[:upper:]'` a=`echo $hex | cut -c-2` b=`echo $hex | cut -c3-4` c=`echo $hex | cut -c5-6` r=`echo "ibase=16; $a" | bc` g=`echo "ibase=16; $b" | bc` b=`echo "ibase=16; $c" | bc` #post to pimatic #generate value to variable, seperated by a comma value=$r','$g','$b #pimatic username user=yourusername #pimatic password password=yourpassword #variable you want to change variable=test #pimatic ip address pimaticip=192.168.0.0 #do the actual variable change through patching curl -s -X PATCH --header "Content-Type:application/json" --data '{"type": "value", "valueOrExpression": "'$value'"}' --user "$user:$password" http://$pimaticip/api/variables/$variable > /dev/null exit 0

Since the forum alters posted code, here is a pastebin link if copying this code doesnt work;

https://pastebin.com/HYRdnkwb

Use sameway as mentioned before.

dummy rgb picker