Hi,
i tried to install domoticz on a Rpi3+.
I made a clean install.
Domoticz is starting WITHOUT any error, but the UI shows the "Offline" page !!

I also tried a clean install with the latest Stretch version. Same issue..
I tried to compile domoticz from source under Buster. Same issue...

What is ...

Blockly ist documented at: https://developers.google.com/blockly/
There is a Online-Guide where you can test your blockly-scripts.
It is also possible to make your own blocks, but it is not so easy....
I managed to implement "Loops", "Math" and "Variables" into domoticz.
It seems to work, but i do ...

It's much more easier to use "external input" in logical blocks.....

ebretteville you are my sunshine !
That is exactly what i am looking for a long time.
i've tried to implement the original google code, but i was not succesful.
in January i will try it with your file.
is there somthing else to do....?