For anybody who might stumble accross this with the same problem:
You might just have switched the values in the javascript section of the webcode:

function toggleCheckbox(element) {
var xhr = new XMLHttpRequest();
if(element.checked){ xhr.open(“GET”, “/update?state=0”, true); }
else { xhr.open(“GET”, “/update?state=1”, true); }
xhr.send();

replace the state=0 with state=1 and vice versa or just replace the original script section with above code, where this is already taken care of.

You need to move the function String outputState() above the function String processor(const String& var) then it should compile in the example above the function String processor(const String& var) is calling a not yet defined function

src/main.cpp:105:28: error: ‘outputState’ was not declared in this scope
String outputStateValue = outputState();
^~~~~~~~~~~
src/main.cpp:105:28: note: suggested alternative: ‘OutputState’
String outputStateValue = outputState();
^~~~~~~~~~~
OutputState
*** [.pio\build\esp32dev\src\main.cpp.o] Error 1

Can you help me?

Thanks for the suggestion once again.
I’ll take a look at it.
Regards,
Sara

Hi Sara, I’m keen too please to see this tutorial and the web socket tutorial have added a code example of multiple buttons. Its easy to learn and modify your code but knowing exactly what to change or add, and what not to touch to expand beyond one IO is difficult. Thankyou.

Hi.
I’m sorry.
I didn’t make that yet.
I already have post lined up for the next month.
Maybe in July… but I can’t promise it..
Regards,
Sara