Newbie help combining two scripts

[scidam]

You likely need to debug what is happening with js-part of the code. Open browser with your url,

Output:
   let el = document.getElementById('temperature')
  el.innerHTML = data.stringify() // you can do this better

open developer tools (e.g. via inspecting some element on the page),
and put a breakpoint to let el .... or el.innerHTML .... The main question here is to inspect data variable (its value, does updateTemp read temp value correctly?).