====== ESP32-Projekte ======
  * https://forum.iobroker.net/topic/7660/siedle-klingel-t%C3%BCr%C3%B6ffner-mit-esp8266-und-mqtt/196
  * heise "überallklingel": {{ :computer:arduino:esp-ueberallklingel_c_t_heise_magazine.pdf |}}
  * https://github.com/tobias-klingel/Embedded-projects/tree/main/Arduino-ESP32/Projects/Noise-detector-to-Influxdb
  * https://eloquentarduino.com/posts/esp32-cam-motion-detection
  * https://medium.com/engineering-iot/building-a-real-time-ocr-system-with-esp32-cam-a-complete-guide-86f40a5312dc