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arduino-cli/libraries/WiFiManager/examples/Parameters/LittleFS/LittleFSParameters.ino

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+/**
+ * Basic example using LittleFS to store data
+ */
+
+#include <Arduino.h>
+#include <LittleFS.h>
+#include <FS.h>
+
+String readFile(fs::FS &fs, const char * path){
+  Serial.printf("Reading file: %s\r\n", path);
+  File file = fs.open(path, "r");
+  if(!file || file.isDirectory()){
+    Serial.println("- empty file or failed to open file");
+    return String();
+  }
+  Serial.println("- read from file:");
+  String fileContent;
+  while(file.available()){
+    fileContent+=String((char)file.read());
+  }
+  file.close();
+  Serial.println(fileContent);
+  return fileContent;
+}
+void writeFile(fs::FS &fs, const char * path, const char * message){
+  Serial.printf("Writing file: %s\r\n", path);
+  File file = fs.open(path, "w");
+  if(!file){
+    Serial.println("- failed to open file for writing");
+    return;
+  }
+  if(file.print(message)){
+    Serial.println("- file written");
+  } else {
+    Serial.println("- write failed");
+  }
+  file.close();
+}
+
+int data = 4; 
+
+#include <WiFiManager.h>
+#define TRIGGER_PIN 2
+int timeout = 120; // seconds to run for
+
+void setup() {
+if (!LittleFS.begin()) { //to start littlefs
+Serial.println("LittleFS mount failed");
+return;
+}
+data = readFile(LittleFS, "/data.txt").toInt();
+WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP  
+  // put your setup code here, to run once:
+  pinMode(TRIGGER_PIN, INPUT_PULLUP);
+  WiFiManager wm;
+  //wm.resetSettings();
+  bool res;
+  res = wm.autoConnect("Setup");
+  if(!res) {
+     Serial.println("Failed to connect");
+     // ESP.restart();
+  } 
+
+}
+
+void loop() {
+if ( digitalRead(TRIGGER_PIN) == LOW) {
+    WiFiManager wm;    
+    //wm.resetSettings();
+    wm.setConfigPortalTimeout(timeout);
+    if (!wm.startConfigPortal("Sharmander")) {
+      Serial.println("failed to connect and hit timeout");
+      delay(3000);
+      ESP.restart();
+      delay(5000);
+    }
+    Serial.println("connected...yeey :)");
+}
+}