Ref Your book:  “Build_WEB_Servers” – chapter 2_5_Websocket_Control_Multiple_Outputs
I am trying to add more GPIO’s and have set the following GPIO’s in main.cpp:

This is a beginnners question I think – just a handling problem in Java.

I have found my error and deleted any not relevant information. It actually was very well explained in the book. I did not understand the grid layout. This problem was solved by going back to the original code and start with addition of one card only.

Also when I modified the GPIO’s it worked without any problems. It turn on and off as planned.

Sorry for this  :-/