ESP8266 EEPROM Wifi credential issues

Projects Programming
1

I am using the following code to save and load credentials to and from EEPROM:

void loadCredentials() {
  EEPROM.begin(512);
  EEPROM.get(0, ssid);
  EEPROM.get(0+sizeof(ssid), password);
  char ok[2+1];
  EEPROM.get(0+sizeof(ssid)+sizeof(password), ok);
  EEPROM.end();
  if (String(ok) != String("OK")) {
    ssid[0] = 0;
    password[0] = 0;
  }
  Serial.println("Recovered credentials:");
  Serial.println(ssid);
  Serial.println(strlen(password)>0?"********":"<no password>");
}

/** Store WLAN credentials to EEPROM */
void saveCredentials() {
  EEPROM.begin(512);
  EEPROM.put(0, ssid);
  EEPROM.put(0+sizeof(ssid), password);
  char ok[2+1] = "OK";
  EEPROM.put(0+sizeof(ssid)+sizeof(password), ok);
  EEPROM.commit();
  EEPROM.end();
  Serial.print("Saving SSID: ");
  Serial.println(ssid);
  Serial.print("Password: ");
  Serial.println(password); 
  Serial.println("Done");
}

However, loadCredentials() always returns empty or invalid credentials. I cannot quite understand why though as saveCredentials() appears to run correctly, and WiFi.begin(ssid, passaord) works without any issues (until you reset)

here is the code used to set the credentials into the variables:

    if(ssidchange){
      a = String(a);
      a.toCharArray(tempssid, 50);
      ssid = tempssid;
      Serial.print("Done, SSID changed to ");
      Serial.println(ssid);
      ssidchange = false;
    }
    else if(passchange){
      char temppass[50];
      String a2 = String(a);
      a2.toCharArray(temppass, 50);
      ssid = tempssid;
      password = temppass;
      Serial.print("SSID changed to ");
      Serial.println(tempssid);
      Serial.print("and pass changed to ");
      Serial.println(password);
      saveCredentials();
      delay(3000);
      ESP.restart();
    }

Compilable verison of the code

Thank you very much in advance!

2

so the esp8266 Arduino EEPROM library is an emulation. it stores in flash.

the esp8266 SDK stores the ssid and password to automatically connect at boot by it self so why store the store the credentials in sketch?
after successful begin(ssid, pass), next time it is enough to wait until connection is established.

3

Ok, thank you for the information and the quick reply. Does this mean that once WiFi.begin(ssid, password) is run it does not have to be executed again upon startup?

Edit: that worked perfectly! Thank you very much!!!