Domotique/WifiControlSensor/EEPROM.ino

/*  EEPROM LAYOUT
                  "BOOTMODE;SSID;PASSWORD;HOSTNAME;MQTT_SERVER;MQTT_USERNAME;MQTT_PASSWD"
    BOOTMODE could be 0 for Setup, 1 for normal use, 2 for OTA
    Setup mode is trigger by setting GPIO3 to ground or at first boot
*/


int saveConfig(int bootMode, String ssid, String password, String host, String mqttServer, String mqttUser, String mqttpasswd) {
  String eeprom;

  eeprom = String(bootMode) + ";" + ssid + ";" + password + ";" + host + ";" + mqttServer +  ";" + mqttUser + ";" + mqttpasswd +";";

  if (eeprom.length() > EEPROM_SIZE )
    return -EMSGSIZE;

  Serial.println("Saving " + eeprom);

  for (int i = 0; i < eeprom.length() && i < EEPROM_SIZE; i++) {
    EEPROM.write(i, eeprom.charAt(i));
  }

  EEPROM.commit();
  delay(100);

  return 0;
}

int saveBootMode(int bootMode) {
  EEPROM.write(0, String(bootMode).charAt(0));
  EEPROM.commit();
  delay(100);
  return 0;
}

void readConfElement(char** element, int &i) {
  *element = &eeprom[i];
  do {
    eeprom[i] = EEPROM.read(i);
    i++;
  } while (i < EEPROM_SIZE && eeprom[i - 1] != ';');
  eeprom[i - 1] = '\0';

  if(i == EEPROM_SIZE)
    **element = '\0';

}

void readEEPROM(int &bootMode, char **ssid, char **password, char **host, char **mqttServer, char **mqttUser, char **mqttPasswd) {

  int i = 2;

  int boot = EEPROM.read(0);

  if (boot == '1') {
    bootMode = BOOTMODE_NORMAL;
  } else if (boot == '2') {
    bootMode = BOOTMODE_OTA;
  } else {
    //Do not need to parse EEPROM when not configured
    bootMode = BOOTMODE_SETUP;
    return;
  }

  readConfElement(ssid, i);
  readConfElement(password, i);
  readConfElement(host, i);
  readConfElement(mqttServer, i);
  readConfElement(mqttUser, i);
  readConfElement(mqttPasswd, i);
}