#include 

Preferences preferences;

void setup() {
    Serial.begin(115200);
    preferences.begin("my-app", false);  // Initialize preferences storage

    // Store a value
    preferences.putInt("key", 123);

    // Retrieve the value
    int value = preferences.getInt("key", 0);
    Serial.println(value);

    preferences.end();
}

void loop() {
    // Your loop code
}