Save data (byte, number and string data types) to the non-volatile storage (NVS) of the ESP32. Wrapper for the ESP32 Preferences library (https://github.com/espressif/arduino-esp32/tree/master/libraries/Preferences). Tutorial on using the library: https://www.hackster.io/wayland2/access-esp32-non-volatile-storage-using-xod-252ec9