In Progress :-)

Setup IDE

* Install the Arduino IDE  (2.3.3)
https://www.arduino.cc/en/software

* Install the ESP32 board package

Add in ArduinoIDE -> Preferences -> add. Board manager 
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
https://dl.espressif.com/dl/package_esp32_index.json

* Download the for the Arduino IDE 2 modified KNX-Stack from Thorsten Gering
 https://github.com/thernst-de/arduino-tpuart-knx-user-forum.git
Save the KnxTpUart Folder in your library folder (in most cases it is C:\Users\USERNAME\Documents\Arduino\libraries)

* Use as Target Board the ESP32S3 Dev Module