Cool! Actually I was looking at and have copied that specific thread. AND - Lord and behold - I have manged to make it work. (Proud Newbie!) The challenge is that I will be using 12 buttons, so I thought I'd copy each sequence over and over and - yeah you get it.
Unfortunately that doesn't seem to work. When starting from button 1 ->4 it works, but I can not seem to be able to turn off 1 again before i've turned off the higher number ones.
I think it is the global variable lightstate that creates the problem. Unfortunately, I'm too newbie to understand what I should do. Changing the name lightstate to lighstate1, ls2, ls3... didn't work so I need help.
The input from the mqtt from my Shelly RGBW switch is
ison: t/f
mode: "white"
brightness: nn
power: nn
overpower: t/f
Thankful for any assistance or pointers in this project! 
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