====== Monitor ======
===== With idf.py =====
Connect to the ESP with the idf.py:
  idf.py -p /dev/ttyUSB0 monitor
  
===== With miniterm =====
Connect to the ESP with the miniterm that is part of the ESP-IDF installation:
   ~/development/esp32/idf-tools/python_env/idf4.2_py3.7_env/bin/miniterm.py /dev/ttyUSB0 115200