Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/AutoConnect/src/commit/258fb327226bfb2ccfc85c02ea2767de53991d86/examples/mqttRSSI
You should set ROOT_URL correctly, otherwise the web may not work correctly.
Hieromon Ikasamo