====== Programmierumgebung auf Linux einrichten ======

  * Ubuntu 20.4, 22.4:
    * add yourself to the group "dialout": ''sudo usemod -a -G dialout $( id -un )''
    * ''sudo apt install git wget flex bison gperf python3 python3-venv cmake ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0d'' 
    * ''sudo apt clean''
    * ''mkdir -p ~/prog/esp32''
    * ''cd ~/prog/esp32''
    * ''git clone --recursive https://github.com/espressif/esp-idf.git''
    * ''cd ~/prog/esp32/esp-idf''
    * ''./install.sh esp32,esp32c3,esp32s2''
    * add to your ~/.bashrc: ''. ~/prog/esp32/esp-idf/export.sh''