Async_AutoConnectWithFSParameters.ino

/****************************************************************************************************************************
  Async_AutoConnectWithFSParameters.ino
  For ESP8266 / ESP32 boards

  ESPAsync_WiFiManager is a library for the ESP8266/Arduino platform, using (ESP)AsyncWebServer to enable easy
  configuration and reconfiguration of WiFi credentials using a Captive Portal.

  Modified from
  1. Tzapu               (https://github.com/tzapu/WiFiManager)
  2. Ken Taylor          (https://github.com/kentaylor)
  3. Alan Steremberg     (https://github.com/alanswx/ESPAsyncWiFiManager)
  4. Khoi Hoang          (https://github.com/khoih-prog/ESP_WiFiManager)

  Built by Khoi Hoang https://github.com/khoih-prog/ESPAsync_WiFiManager
  Licensed under MIT license
 *****************************************************************************************************************************/

#if !( defined(ESP8266) ||  defined(ESP32) )
  #error This code is intended to run on the ESP8266 or ESP32 platform! Please check your Tools->Board setting.
#endif

#define ESP_ASYNC_WIFIMANAGER_VERSION_MIN_TARGET      "ESPAsync_WiFiManager v1.15.0"
#define ESP_ASYNC_WIFIMANAGER_VERSION_MIN             1015000

// Use from 0 to 4. Higher number, more debugging messages and memory usage.
#define _ESPASYNC_WIFIMGR_LOGLEVEL_    3

// To not display stored SSIDs and PWDs on Config Portal, select false. Default is true
// Even the stored Credentials are not display, just leave them all blank to reconnect and reuse the stored Credentials
//#define DISPLAY_STORED_CREDENTIALS_IN_CP        false

#include <FS.h>

//Ported to ESP32
#ifdef ESP32
  #include <esp_wifi.h>
  #include <WiFi.h>
  #include <WiFiClient.h>

  // From v1.1.1
  #include <WiFiMulti.h>
  WiFiMulti wifiMulti;

  // LittleFS has higher priority than SPIFFS
  #if ( defined(ESP_ARDUINO_VERSION_MAJOR) && (ESP_ARDUINO_VERSION_MAJOR >= 2) )
    #define USE_LITTLEFS    true
    #define USE_SPIFFS      false
  #elif defined(ARDUINO_ESP32C3_DEV)
    // For core v1.0.6-, ESP32-C3 only supporting SPIFFS and EEPROM. To use v2.0.0+ for LittleFS
    #define USE_LITTLEFS          false
    #define USE_SPIFFS            true
  #endif

  #if USE_LITTLEFS
    // Use LittleFS
    #include "FS.h"

    // Check cores/esp32/esp_arduino_version.h and cores/esp32/core_version.h
    //#if ( ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(2, 0, 0) )  //(ESP_ARDUINO_VERSION_MAJOR >= 2)
    #if ( defined(ESP_ARDUINO_VERSION_MAJOR) && (ESP_ARDUINO_VERSION_MAJOR >= 2) )
      #if (_ESPASYNC_WIFIMGR_LOGLEVEL_ > 3)
        #warning Using ESP32 Core 1.0.6 or 2.0.0+
      #endif

      // The library has been merged into esp32 core from release 1.0.6
      #include <LittleFS.h>       // https://github.com/espressif/arduino-esp32/tree/master/libraries/LittleFS

      FS* filesystem =      &LittleFS;
      #define FileFS        LittleFS
      #define FS_Name       "LittleFS"
    #else
      #if (_ESPASYNC_WIFIMGR_LOGLEVEL_ > 3)
        #warning Using ESP32 Core 1.0.5-. You must install LITTLEFS library
      #endif

      // The library has been merged into esp32 core from release 1.0.6
      #include <LITTLEFS.h>       // https://github.com/lorol/LITTLEFS

      FS* filesystem =      &LITTLEFS;
      #define FileFS        LITTLEFS
      #define FS_Name       "LittleFS"
    #endif

  #elif USE_SPIFFS
    #include <SPIFFS.h>
    FS* filesystem =      &SPIFFS;
    #define FileFS        SPIFFS
    #define FS_Name       "SPIFFS"
  #else
    // +Use FFat
    #include <FFat.h>
    FS* filesystem =      &FFat;
    #define FileFS        FFat
    #define FS_Name       "FFat"
  #endif
  //////

  #define LED_BUILTIN       2
  #define LED_ON            HIGH
  #define LED_OFF           LOW

#else

  #include <ESP8266WiFi.h>          //https://github.com/esp8266/Arduino
  //needed for library
  #include <ESPAsyncDNSServer.h>

  // From v1.1.1
  #include <ESP8266WiFiMulti.h>
  ESP8266WiFiMulti wifiMulti;

  #define USE_LITTLEFS      true

  #if USE_LITTLEFS
    #include <LittleFS.h>
    FS* filesystem =      &LittleFS;
    #define FileFS        LittleFS
    #define FS_Name       "LittleFS"
  #else
    FS* filesystem =      &SPIFFS;
    #define FileFS        SPIFFS
    #define FS_Name       "SPIFFS"
  #endif
  //////

  #define ESP_getChipId()   (ESP.getChipId())

  #define LED_ON      LOW
  #define LED_OFF     HIGH
#endif

// Pin D2 mapped to pin GPIO2/ADC12 of ESP32, or GPIO2/TXD1 of NodeMCU control on-board LED
#define PIN_LED       LED_BUILTIN

// Now support ArduinoJson 6.0.0+ ( tested with v6.14.1 )
#include <ArduinoJson.h>          //https://github.com/bblanchon/ArduinoJson

char configFileName[] = "/config.json";

// SSID and PW for your Router
String Router_SSID;
String Router_Pass;

// From v1.1.1
// You only need to format the filesystem once
//#define FORMAT_FILESYSTEM       true
#define FORMAT_FILESYSTEM         false

#define MIN_AP_PASSWORD_SIZE    8

#define SSID_MAX_LEN            32
//From v1.0.10, WPA2 passwords can be up to 63 characters long.
#define PASS_MAX_LEN            64

typedef struct
{
  char wifi_ssid[SSID_MAX_LEN];
  char wifi_pw  [PASS_MAX_LEN];
}  WiFi_Credentials;

typedef struct
{
  String wifi_ssid;
  String wifi_pw;
}  WiFi_Credentials_String;

#define NUM_WIFI_CREDENTIALS      2

// Assuming max 49 chars
#define TZNAME_MAX_LEN            50
#define TIMEZONE_MAX_LEN          50

typedef struct
{
  WiFi_Credentials  WiFi_Creds [NUM_WIFI_CREDENTIALS];
  char TZ_Name[TZNAME_MAX_LEN];     // "America/Toronto"
  char TZ[TIMEZONE_MAX_LEN];        // "EST5EDT,M3.2.0,M11.1.0"
  uint16_t checksum;
} WM_Config;

WM_Config         WM_config;

#define  CONFIG_FILENAME              F("/wifi_cred.dat")
//////

// Indicates whether ESP has WiFi credentials saved from previous session, or double reset detected
bool initialConfig = false;

// SSID and PW for Config Portal
String AP_SSID;
String AP_PASS;

// Use false if you don't like to display Available Pages in Information Page of Config Portal
// Comment out or use true to display Available Pages in Information Page of Config Portal
// Must be placed before #include <ESP_WiFiManager.h>
#define USE_AVAILABLE_PAGES     true

// From v1.0.10 to permit disable/enable StaticIP configuration in Config Portal from sketch. Valid only if DHCP is used.
// You'll loose the feature of dynamically changing from DHCP to static IP, or vice versa
// You have to explicitly specify false to disable the feature.
//#define USE_STATIC_IP_CONFIG_IN_CP          false

// Use false to disable NTP config. Advisable when using Cellphone, Tablet to access Config Portal.
// See Issue 23: On Android phone ConfigPortal is unresponsive (https://github.com/khoih-prog/ESP_WiFiManager/issues/23)
#define USE_ESP_WIFIMANAGER_NTP     true

// Just use enough to save memory. On ESP8266, can cause blank ConfigPortal screen
// if using too much memory
#define USING_AFRICA        false
#define USING_AMERICA       true
#define USING_ANTARCTICA    false
#define USING_ASIA          false
#define USING_ATLANTIC      false
#define USING_AUSTRALIA     false
#define USING_EUROPE        false
#define USING_INDIAN        false
#define USING_PACIFIC       false
#define USING_ETC_GMT       false

// Use true to enable CloudFlare NTP service. System can hang if you don't have Internet access while accessing CloudFlare
// See Issue #21: CloudFlare link in the default portal (https://github.com/khoih-prog/ESP_WiFiManager/issues/21)
#define USE_CLOUDFLARE_NTP          false

// New in v1.0.11
#define USING_CORS_FEATURE          true

////////////////////////////////////////////

// Use USE_DHCP_IP == true for dynamic DHCP IP, false to use static IP which you have to change accordingly to your network
#if (defined(USE_STATIC_IP_CONFIG_IN_CP) && !USE_STATIC_IP_CONFIG_IN_CP)
  // Force DHCP to be true
  #if defined(USE_DHCP_IP)
    #undef USE_DHCP_IP
  #endif
  #define USE_DHCP_IP     true
#else
  // You can select DHCP or Static IP here
  #define USE_DHCP_IP     true
  //#define USE_DHCP_IP     false
#endif

#if ( USE_DHCP_IP )
  // Use DHCP

  #if (_ESPASYNC_WIFIMGR_LOGLEVEL_ > 3)
    #warning Using DHCP IP
  #endif

  IPAddress stationIP   = IPAddress(0, 0, 0, 0);
  IPAddress gatewayIP   = IPAddress(192, 168, 2, 1);
  IPAddress netMask     = IPAddress(255, 255, 255, 0);

#else
  // Use static IP

  #if (_ESPASYNC_WIFIMGR_LOGLEVEL_ > 3)
    #warning Using static IP
  #endif

  #ifdef ESP32
    IPAddress stationIP   = IPAddress(192, 168, 2, 232);
  #else
    IPAddress stationIP   = IPAddress(192, 168, 2, 186);
  #endif

  IPAddress gatewayIP   = IPAddress(192, 168, 2, 1);
  IPAddress netMask     = IPAddress(255, 255, 255, 0);
#endif

////////////////////////////////////////////


#define USE_CONFIGURABLE_DNS      true

IPAddress dns1IP      = gatewayIP;
IPAddress dns2IP      = IPAddress(8, 8, 8, 8);

#define USE_CUSTOM_AP_IP          false

IPAddress APStaticIP  = IPAddress(192, 168, 100, 1);
IPAddress APStaticGW  = IPAddress(192, 168, 100, 1);
IPAddress APStaticSN  = IPAddress(255, 255, 255, 0);

#include <ESPAsync_WiFiManager.h>               //https://github.com/khoih-prog/ESPAsync_WiFiManager

// Redundant, for v1.10.0 only
//#include <ESPAsync_WiFiManager-Impl.h>          //https://github.com/khoih-prog/ESPAsync_WiFiManager

#define HTTP_PORT           80

//define your default values here, if there are different values in configFileName (config.json), they are overwritten.
#define BLYNK_SERVER_LEN                64
#define BLYNK_TOKEN_LEN                 32
#define BLYNK_SERVER_PORT_LEN           6

#define MQTT_SERVER_MAX_LEN             40
#define MQTT_SERVER_PORT_LEN            6

char blynk_server [BLYNK_SERVER_LEN]        = "account.duckdns.org";
char blynk_port   [BLYNK_SERVER_PORT_LEN]   = "8080";
char blynk_token  [BLYNK_TOKEN_LEN]         = "YOUR_BLYNK_TOKEN";

char mqtt_server  [MQTT_SERVER_MAX_LEN];
char mqtt_port    [MQTT_SERVER_PORT_LEN]    = "8080";

///////////////////////////////////////////
// New in v1.4.0
/******************************************
   // Defined in ESPAsync_WiFiManager.h
  typedef struct
  {
  IPAddress _ap_static_ip;
  IPAddress _ap_static_gw;
  IPAddress _ap_static_sn;

  }  WiFi_AP_IPConfig;

  typedef struct
  {
  IPAddress _sta_static_ip;
  IPAddress _sta_static_gw;
  IPAddress _sta_static_sn;
  #if USE_CONFIGURABLE_DNS
  IPAddress _sta_static_dns1;
  IPAddress _sta_static_dns2;
  #endif
  }  WiFi_STA_IPConfig;
******************************************/

WiFi_AP_IPConfig  WM_AP_IPconfig;
WiFi_STA_IPConfig WM_STA_IPconfig;

void initAPIPConfigStruct(WiFi_AP_IPConfig &in_WM_AP_IPconfig)
{
  in_WM_AP_IPconfig._ap_static_ip   = APStaticIP;
  in_WM_AP_IPconfig._ap_static_gw   = APStaticGW;
  in_WM_AP_IPconfig._ap_static_sn   = APStaticSN;
}

void initSTAIPConfigStruct(WiFi_STA_IPConfig &in_WM_STA_IPconfig)
{
  in_WM_STA_IPconfig._sta_static_ip   = stationIP;
  in_WM_STA_IPconfig._sta_static_gw   = gatewayIP;
  in_WM_STA_IPconfig._sta_static_sn   = netMask;
#if USE_CONFIGURABLE_DNS
  in_WM_STA_IPconfig._sta_static_dns1 = dns1IP;
  in_WM_STA_IPconfig._sta_static_dns2 = dns2IP;
#endif
}

void displayIPConfigStruct(WiFi_STA_IPConfig in_WM_STA_IPconfig)
{
  LOGERROR3(F("stationIP ="), in_WM_STA_IPconfig._sta_static_ip, ", gatewayIP =", in_WM_STA_IPconfig._sta_static_gw);
  LOGERROR1(F("netMask ="), in_WM_STA_IPconfig._sta_static_sn);
#if USE_CONFIGURABLE_DNS
  LOGERROR3(F("dns1IP ="), in_WM_STA_IPconfig._sta_static_dns1, ", dns2IP =", in_WM_STA_IPconfig._sta_static_dns2);
#endif
}

void configWiFi(WiFi_STA_IPConfig in_WM_STA_IPconfig)
{
#if USE_CONFIGURABLE_DNS
  // Set static IP, Gateway, Subnetmask, DNS1 and DNS2. New in v1.0.5
  WiFi.config(in_WM_STA_IPconfig._sta_static_ip, in_WM_STA_IPconfig._sta_static_gw, in_WM_STA_IPconfig._sta_static_sn,
              in_WM_STA_IPconfig._sta_static_dns1, in_WM_STA_IPconfig._sta_static_dns2);
#else
  // Set static IP, Gateway, Subnetmask, Use auto DNS1 and DNS2.
  WiFi.config(in_WM_STA_IPconfig._sta_static_ip, in_WM_STA_IPconfig._sta_static_gw, in_WM_STA_IPconfig._sta_static_sn);
#endif
}

///////////////////////////////////////////

uint8_t connectMultiWiFi()
{
#if ESP32
  // For ESP32, this better be 0 to shorten the connect time.
  // For ESP32-S2/C3, must be > 500
#if ( USING_ESP32_S2 || USING_ESP32_C3 )
#define WIFI_MULTI_1ST_CONNECT_WAITING_MS           500L
#else
  // For ESP32 core v1.0.6, must be >= 500
#define WIFI_MULTI_1ST_CONNECT_WAITING_MS           800L
#endif
#else
  // For ESP8266, this better be 2200 to enable connect the 1st time
#define WIFI_MULTI_1ST_CONNECT_WAITING_MS             2200L
#endif

#define WIFI_MULTI_CONNECT_WAITING_MS                   500L

  uint8_t status;

  //WiFi.mode(WIFI_STA);

  LOGERROR(F("ConnectMultiWiFi with :"));

  if ( (Router_SSID != "") && (Router_Pass != "") )
  {
    LOGERROR3(F("* Flash-stored Router_SSID = "), Router_SSID, F(", Router_Pass = "), Router_Pass );
    LOGERROR3(F("* Add SSID = "), Router_SSID, F(", PW = "), Router_Pass );
    wifiMulti.addAP(Router_SSID.c_str(), Router_Pass.c_str());
  }

  for (uint8_t i = 0; i < NUM_WIFI_CREDENTIALS; i++)
  {
    // Don't permit NULL SSID and password len < MIN_AP_PASSWORD_SIZE (8)
    if ( (String(WM_config.WiFi_Creds[i].wifi_ssid) != "")
         && (strlen(WM_config.WiFi_Creds[i].wifi_pw) >= MIN_AP_PASSWORD_SIZE) )
    {
      LOGERROR3(F("* Additional SSID = "), WM_config.WiFi_Creds[i].wifi_ssid, F(", PW = "), WM_config.WiFi_Creds[i].wifi_pw );
    }
  }

  LOGERROR(F("Connecting MultiWifi..."));

  //WiFi.mode(WIFI_STA);

#if !USE_DHCP_IP
  // New in v1.4.0
  configWiFi(WM_STA_IPconfig);
  //////
#endif

  int i = 0;
  status = wifiMulti.run();
  delay(WIFI_MULTI_1ST_CONNECT_WAITING_MS);

  while ( ( i++ < 20 ) && ( status != WL_CONNECTED ) )
  {
    status = WiFi.status();

    if ( status == WL_CONNECTED )
      break;
    else
      delay(WIFI_MULTI_CONNECT_WAITING_MS);
  }

  if ( status == WL_CONNECTED )
  {
    LOGERROR1(F("WiFi connected after time: "), i);
    LOGERROR3(F("SSID:"), WiFi.SSID(), F(",RSSI="), WiFi.RSSI());
    LOGERROR3(F("Channel:"), WiFi.channel(), F(",IP address:"), WiFi.localIP() );
  }
  else
  {
    LOGERROR(F("WiFi not connected"));

#if ESP8266
    ESP.reset();
#else
    ESP.restart();
#endif
  }

  return status;
}

//flag for saving data
bool shouldSaveConfig = false;

//callback notifying us of the need to save config
void saveConfigCallback()
{
  Serial.println(F("Should save config"));
  shouldSaveConfig = true;
}

bool loadFileFSConfigFile()
{
  //clean FS, for testing
  //FileFS.format();

  //read configuration from FS json
  Serial.println(F("Mounting FS..."));

  if (FileFS.begin())
  {
    Serial.println(F("Mounted file system"));

    if (FileFS.exists(configFileName))
    {
      //file exists, reading and loading
      Serial.println(F("Reading config file"));
      File configFile = FileFS.open(configFileName, "r");

      if (configFile)
      {
        Serial.print(F("Opened config file, size = "));
        size_t configFileSize = configFile.size();
        Serial.println(configFileSize);

        // Allocate a buffer to store contents of the file.
        std::unique_ptr<char[]> buf(new char[configFileSize + 1]);

        configFile.readBytes(buf.get(), configFileSize);

        Serial.print(F("\nJSON parseObject() result : "));

#if (ARDUINOJSON_VERSION_MAJOR >= 6)
        DynamicJsonDocument json(1024);
        auto deserializeError = deserializeJson(json, buf.get(), configFileSize);

        if ( deserializeError )
        {
          Serial.println(F("failed"));
          return false;
        }
        else
        {
          Serial.println(F("OK"));

          if (json["blynk_server"])
            strncpy(blynk_server, json["blynk_server"], sizeof(blynk_server));

          if (json["blynk_port"])
            strncpy(blynk_port, json["blynk_port"], sizeof(blynk_port));

          if (json["blynk_token"])
            strncpy(blynk_token,  json["blynk_token"], sizeof(blynk_token));

          if (json["mqtt_server"])
            strncpy(mqtt_server, json["mqtt_server"], sizeof(mqtt_server));

          if (json["mqtt_port"])
            strncpy(mqtt_port,   json["mqtt_port"], sizeof(mqtt_port));
        }

        //serializeJson(json, Serial);
        serializeJsonPretty(json, Serial);
#else
        DynamicJsonBuffer jsonBuffer;
        // Parse JSON string
        JsonObject& json = jsonBuffer.parseObject(buf.get());
        // Test if parsing succeeds.

        if (json.success())
        {
          Serial.println("OK");

          if (json["blynk_server"])
            strncpy(blynk_server, json["blynk_server"], sizeof(blynk_server));

          if (json["blynk_port"])
            strncpy(blynk_port, json["blynk_port"], sizeof(blynk_port));

          if (json["blynk_token"])
            strncpy(blynk_token,  json["blynk_token"], sizeof(blynk_token));

          if (json["mqtt_server"])
            strncpy(mqtt_server, json["mqtt_server"], sizeof(mqtt_server));

          if (json["mqtt_port"])
            strncpy(mqtt_port,   json["mqtt_port"], sizeof(mqtt_port));
        }
        else
        {
          Serial.println(F("failed"));
          return false;
        }

        //json.printTo(Serial);
        json.prettyPrintTo(Serial);
#endif

        configFile.close();
      }
    }
  }
  else
  {
    Serial.println(F("failed to mount FS"));
    return false;
  }

  return true;
}

bool saveFileFSConfigFile()
{
  Serial.println(F("Saving config"));

#if (ARDUINOJSON_VERSION_MAJOR >= 6)
  DynamicJsonDocument json(1024);
#else
  DynamicJsonBuffer jsonBuffer;
  JsonObject& json = jsonBuffer.createObject();
#endif

  json["blynk_server"] = blynk_server;
  json["blynk_port"]   = blynk_port;
  json["blynk_token"]  = blynk_token;

  json["mqtt_server"] = mqtt_server;
  json["mqtt_port"]   = mqtt_port;

  File configFile = FileFS.open(configFileName, "w");

  if (!configFile)
  {
    Serial.println(F("Failed to open config file for writing"));

    return false;
  }

#if (ARDUINOJSON_VERSION_MAJOR >= 6)
  //serializeJson(json, Serial);
  serializeJsonPretty(json, Serial);
  // Write data to file and close it
  serializeJson(json, configFile);
#else
  //json.printTo(Serial);
  json.prettyPrintTo(Serial);
  // Write data to file and close it
  json.printTo(configFile);
#endif

  configFile.close();
  //end save

  return true;
}

void toggleLED()
{
  //toggle state
  digitalWrite(PIN_LED, !digitalRead(PIN_LED));
}

#if USE_ESP_WIFIMANAGER_NTP

void printLocalTime()
{
#if ESP8266
  static time_t now;

  now = time(nullptr);

  if ( now > 1451602800 )
  {
    Serial.print("Local Date/Time: ");
    Serial.print(ctime(&now));
  }

#else
  struct tm timeinfo;

  getLocalTime( &timeinfo );

  // Valid only if year > 2000.
  // You can get from timeinfo : tm_year, tm_mon, tm_mday, tm_hour, tm_min, tm_sec
  if (timeinfo.tm_year > 100 )
  {
    Serial.print("Local Date/Time: ");
    Serial.print( asctime( &timeinfo ) );
  }

#endif
}

#endif

void heartBeatPrint()
{
#if USE_ESP_WIFIMANAGER_NTP
  printLocalTime();
#else
  static int num = 1;

  if (WiFi.status() == WL_CONNECTED)
    Serial.print(F("H"));        // H means connected to WiFi
  else
    Serial.print(F("F"));        // F means not connected to WiFi

  if (num == 80)
  {
    Serial.println();
    num = 1;
  }
  else if (num++ % 10 == 0)
  {
    Serial.print(F(" "));
  }

#endif
}

void check_WiFi()
{
  if ( (WiFi.status() != WL_CONNECTED) )
  {
    Serial.println(F("\nWiFi lost. Call connectMultiWiFi in loop"));
    connectMultiWiFi();
  }
}

void check_status()
{
  static ulong checkstatus_timeout  = 0;
  static ulong LEDstatus_timeout    = 0;
  static ulong checkwifi_timeout    = 0;

  static ulong current_millis;

#define WIFICHECK_INTERVAL    1000L

#if USE_ESP_WIFIMANAGER_NTP
#define HEARTBEAT_INTERVAL    60000L
#else
#define HEARTBEAT_INTERVAL    10000L
#endif

#define LED_INTERVAL          2000L

  current_millis = millis();

  // Check WiFi every WIFICHECK_INTERVAL (1) seconds.
  if ((current_millis > checkwifi_timeout) || (checkwifi_timeout == 0))
  {
    check_WiFi();
    checkwifi_timeout = current_millis + WIFICHECK_INTERVAL;
  }

  if ((current_millis > LEDstatus_timeout) || (LEDstatus_timeout == 0))
  {
    // Toggle LED at LED_INTERVAL = 2s
    toggleLED();
    LEDstatus_timeout = current_millis + LED_INTERVAL;
  }

  // Print hearbeat every HEARTBEAT_INTERVAL (10) seconds.
  if ((current_millis > checkstatus_timeout) || (checkstatus_timeout == 0))
  {
    heartBeatPrint();
    checkstatus_timeout = current_millis + HEARTBEAT_INTERVAL;
  }
}

int calcChecksum(uint8_t* address, uint16_t sizeToCalc)
{
  uint16_t checkSum = 0;

  for (uint16_t index = 0; index < sizeToCalc; index++)
  {
    checkSum += * ( ( (byte*) address ) + index);
  }

  return checkSum;
}

bool loadConfigData()
{
  File file = FileFS.open(CONFIG_FILENAME, "r");
  LOGERROR(F("LoadWiFiCfgFile "));

  memset((void *) &WM_config,       0, sizeof(WM_config));

  // New in v1.4.0
  memset((void *) &WM_STA_IPconfig, 0, sizeof(WM_STA_IPconfig));
  //////

  if (file)
  {
    file.readBytes((char *) &WM_config,   sizeof(WM_config));

    // New in v1.4.0
    file.readBytes((char *) &WM_STA_IPconfig, sizeof(WM_STA_IPconfig));
    //////

    file.close();
    LOGERROR(F("OK"));

    if ( WM_config.checksum != calcChecksum( (uint8_t*) &WM_config, sizeof(WM_config) - sizeof(WM_config.checksum) ) )
    {
      LOGERROR(F("WM_config checksum wrong"));

      return false;
    }

    // New in v1.4.0
    displayIPConfigStruct(WM_STA_IPconfig);
    //////

    return true;
  }
  else
  {
    LOGERROR(F("failed"));

    return false;
  }
}

void saveConfigData()
{
  File file = FileFS.open(CONFIG_FILENAME, "w");
  LOGERROR(F("SaveWiFiCfgFile "));

  if (file)
  {
    WM_config.checksum = calcChecksum( (uint8_t*) &WM_config, sizeof(WM_config) - sizeof(WM_config.checksum) );

    file.write((uint8_t*) &WM_config, sizeof(WM_config));

    displayIPConfigStruct(WM_STA_IPconfig);

    // New in v1.4.0
    file.write((uint8_t*) &WM_STA_IPconfig, sizeof(WM_STA_IPconfig));
    //////

    file.close();
    LOGERROR(F("OK"));
  }
  else
  {
    LOGERROR(F("failed"));
  }
}

void setup()
{
  // put your setup code here, to run once:
  Serial.begin(115200);

  while (!Serial);

  delay(200);

  Serial.print(F("\nStarting Async_AutoConnectWithFSParams using "));
  Serial.print(FS_Name);
  Serial.print(F(" on "));
  Serial.println(ARDUINO_BOARD);
  Serial.println(ESP_ASYNC_WIFIMANAGER_VERSION);

#if defined(ESP_ASYNC_WIFIMANAGER_VERSION_INT)

  if (ESP_ASYNC_WIFIMANAGER_VERSION_INT < ESP_ASYNC_WIFIMANAGER_VERSION_MIN)
  {
    Serial.print("Warning. Must use this example on Version later than : ");
    Serial.println(ESP_ASYNC_WIFIMANAGER_VERSION_MIN_TARGET);
  }

#endif

  if (FORMAT_FILESYSTEM)
    FileFS.format();

  // Format FileFS if not yet
#ifdef ESP32

  if (!FileFS.begin(true))
#else
  if (!FileFS.begin())
#endif
  {
#ifdef ESP8266
    FileFS.format();
#endif

    Serial.println(F("SPIFFS/LittleFS failed! Already tried formatting."));

    if (!FileFS.begin())
    {
      // prevents debug info from the library to hide err message.
      delay(100);

#if USE_LITTLEFS
      Serial.println(F("LittleFS failed!. Please use SPIFFS or EEPROM. Stay forever"));
#else
      Serial.println(F("SPIFFS failed!. Please use LittleFS or EEPROM. Stay forever"));
#endif

      while (true)
      {
        delay(1);
      }
    }
  }

  loadFileFSConfigFile();

  // The extra parameters to be configured (can be either global or just in the setup)
  // After connecting, parameter.getValue() will get you the configured value
  // id/name placeholder/prompt default length
  ESPAsync_WMParameter custom_blynk_server("blynk_server", "blynk_server", blynk_server, BLYNK_SERVER_LEN + 1);
  ESPAsync_WMParameter custom_blynk_port  ("blynk_port",   "blynk_port",   blynk_port,   BLYNK_SERVER_PORT_LEN + 1);
  ESPAsync_WMParameter custom_blynk_token ("blynk_token",  "blynk_token",  blynk_token,  BLYNK_TOKEN_LEN + 1 );

  ESPAsync_WMParameter custom_mqtt_server("mqtt_server", "mqtt_server", mqtt_server, MQTT_SERVER_MAX_LEN + 1);
  ESPAsync_WMParameter custom_mqtt_port  ("mqtt_port",   "mqtt_port",   mqtt_port,   MQTT_SERVER_PORT_LEN + 1);

  unsigned long startedAt = millis();

  // New in v1.4.0
  initAPIPConfigStruct(WM_AP_IPconfig);
  initSTAIPConfigStruct(WM_STA_IPconfig);
  //////

  //Local intialization. Once its business is done, there is no need to keep it around
  // Use this to default DHCP hostname to ESP8266-XXXXXX or ESP32-XXXXXX
  //ESPAsync_WiFiManager ESPAsync_wifiManager(&webServer, &dnsServer);
  // Use this to personalize DHCP hostname (RFC952 conformed)
  AsyncWebServer webServer(HTTP_PORT);

#if ( USING_ESP32_S2 || USING_ESP32_C3 )
  ESPAsync_WiFiManager ESPAsync_wifiManager(&webServer, NULL, "AutoConnect-FSParams");
#else
  AsyncDNSServer dnsServer;

  ESPAsync_WiFiManager ESPAsync_wifiManager(&webServer, &dnsServer, "AutoConnect-FSParams");
#endif

  //set config save notify callback
  ESPAsync_wifiManager.setSaveConfigCallback(saveConfigCallback);

  //add all your parameters here
  ESPAsync_wifiManager.addParameter(&custom_blynk_server);
  ESPAsync_wifiManager.addParameter(&custom_blynk_port);
  ESPAsync_wifiManager.addParameter(&custom_blynk_token);

  ESPAsync_wifiManager.addParameter(&custom_mqtt_server);
  ESPAsync_wifiManager.addParameter(&custom_mqtt_port);

  //reset settings - for testing
  //ESPAsync_wifiManager.resetSettings();

  ESPAsync_wifiManager.setDebugOutput(true);

#if USE_CUSTOM_AP_IP
  //set custom ip for portal
  // New in v1.4.0
  ESPAsync_wifiManager.setAPStaticIPConfig(WM_AP_IPconfig);
  //////
#endif

  //set minimum quality of signal so it ignores AP's under that quality
  //defaults to 8%
  //ESPAsync_wifiManager.setMinimumSignalQuality();
  ESPAsync_wifiManager.setMinimumSignalQuality(-1);

  // From v1.0.10 only
  // Set config portal channel, default = 1. Use 0 => random channel from 1-13
  ESPAsync_wifiManager.setConfigPortalChannel(0);
  //////

#if !USE_DHCP_IP
  // Set (static IP, Gateway, Subnetmask, DNS1 and DNS2) or (IP, Gateway, Subnetmask). New in v1.0.5
  // New in v1.4.0
  ESPAsync_wifiManager.setSTAStaticIPConfig(WM_STA_IPconfig);
  //////
#endif

  // New from v1.1.1
#if USING_CORS_FEATURE
  ESPAsync_wifiManager.setCORSHeader("Your Access-Control-Allow-Origin");
#endif

  // We can't use WiFi.SSID() in ESP32 as it's only valid after connected.
  // SSID and Password stored in ESP32 wifi_ap_record_t and wifi_config_t are also cleared in reboot
  // Have to create a new function to store in EEPROM/SPIFFS/LittleFS for this purpose
  Router_SSID = ESPAsync_wifiManager.WiFi_SSID();
  Router_Pass = ESPAsync_wifiManager.WiFi_Pass();

  //Remove this line if you do not want to see WiFi password printed
  Serial.println("ESP Self-Stored: SSID = " + Router_SSID + ", Pass = " + Router_Pass);

  bool configDataLoaded = false;

  // From v1.1.0, Don't permit NULL password
  if ( (Router_SSID != "") && (Router_Pass != "") )
  {
    LOGERROR3(F("* Add SSID = "), Router_SSID, F(", PW = "), Router_Pass);
    wifiMulti.addAP(Router_SSID.c_str(), Router_Pass.c_str());

    ESPAsync_wifiManager.setConfigPortalTimeout(120); //If no access point name has been previously entered disable timeout.
    Serial.println(F("Got ESP Self-Stored Credentials. Timeout 120s for Config Portal"));
  }

  if (loadConfigData())
  {
    configDataLoaded = true;

    ESPAsync_wifiManager.setConfigPortalTimeout(120); //If no access point name has been previously entered disable timeout.
    Serial.println(F("Got stored Credentials. Timeout 120s for Config Portal"));

#if USE_ESP_WIFIMANAGER_NTP

    if ( strlen(WM_config.TZ_Name) > 0 )
    {
      LOGERROR3(F("Current TZ_Name ="), WM_config.TZ_Name, F(", TZ = "), WM_config.TZ);

#if ESP8266
      configTime(WM_config.TZ, "pool.ntp.org");
#else
      //configTzTime(WM_config.TZ, "pool.ntp.org" );
      configTzTime(WM_config.TZ, "time.nist.gov", "0.pool.ntp.org", "1.pool.ntp.org");
#endif
    }
    else
    {
      Serial.println(F("Current Timezone is not set. Enter Config Portal to set."));
    }

#endif
  }
  else
  {
    // Enter CP only if no stored SSID on flash and file
    Serial.println(F("Open Config Portal without Timeout: No stored Credentials."));
    initialConfig = true;
  }

  String chipID = String(ESP_getChipId(), HEX);
  chipID.toUpperCase();

  // SSID and PW for Config Portal
  AP_SSID = "ESP_" + chipID + "_AutoConnectAP";
  AP_PASS = "MyESP_" + chipID;

  if (initialConfig)
  {
    Serial.println(F("We haven't got any access point credentials, so get them now"));

    Serial.print(F("Starting configuration portal @ "));

#if USE_CUSTOM_AP_IP
    Serial.print(APStaticIP);
#else
    Serial.print(F("192.168.4.1"));
#endif

    Serial.print(F(", SSID = "));
    Serial.print(AP_SSID);
    Serial.print(F(", PWD = "));
    Serial.println(AP_PASS);

#if DISPLAY_STORED_CREDENTIALS_IN_CP
    // New. Update Credentials, got from loadConfigData(), to display on CP
    ESPAsync_wifiManager.setCredentials(WM_config.WiFi_Creds[0].wifi_ssid, WM_config.WiFi_Creds[0].wifi_pw,
                                        WM_config.WiFi_Creds[1].wifi_ssid, WM_config.WiFi_Creds[1].wifi_pw);
#endif

    // Starts an access point
    //if (!ESPAsync_wifiManager.startConfigPortal((const char *) ssid.c_str(), password))
    if ( !ESPAsync_wifiManager.startConfigPortal(AP_SSID.c_str(), AP_PASS.c_str()) )
      Serial.println(F("Not connected to WiFi but continuing anyway."));
    else
      Serial.println(F("WiFi connected...yeey :)"));

    // Stored  for later usage, from v1.1.0, but clear first
    memset(&WM_config, 0, sizeof(WM_config));

    for (uint8_t i = 0; i < NUM_WIFI_CREDENTIALS; i++)
    {
      String tempSSID = ESPAsync_wifiManager.getSSID(i);
      String tempPW   = ESPAsync_wifiManager.getPW(i);

      if (strlen(tempSSID.c_str()) < sizeof(WM_config.WiFi_Creds[i].wifi_ssid) - 1)
        strcpy(WM_config.WiFi_Creds[i].wifi_ssid, tempSSID.c_str());
      else
        strncpy(WM_config.WiFi_Creds[i].wifi_ssid, tempSSID.c_str(), sizeof(WM_config.WiFi_Creds[i].wifi_ssid) - 1);

      if (strlen(tempPW.c_str()) < sizeof(WM_config.WiFi_Creds[i].wifi_pw) - 1)
        strcpy(WM_config.WiFi_Creds[i].wifi_pw, tempPW.c_str());
      else
        strncpy(WM_config.WiFi_Creds[i].wifi_pw, tempPW.c_str(), sizeof(WM_config.WiFi_Creds[i].wifi_pw) - 1);

      // Don't permit NULL SSID and password len < MIN_AP_PASSWORD_SIZE (8)
      if ( (String(WM_config.WiFi_Creds[i].wifi_ssid) != "")
           && (strlen(WM_config.WiFi_Creds[i].wifi_pw) >= MIN_AP_PASSWORD_SIZE) )
      {
        LOGERROR3(F("* Add SSID = "), WM_config.WiFi_Creds[i].wifi_ssid, F(", PW = "), WM_config.WiFi_Creds[i].wifi_pw );
        wifiMulti.addAP(WM_config.WiFi_Creds[i].wifi_ssid, WM_config.WiFi_Creds[i].wifi_pw);
      }
    }

#if USE_ESP_WIFIMANAGER_NTP
    String tempTZ   = ESPAsync_wifiManager.getTimezoneName();

    if (strlen(tempTZ.c_str()) < sizeof(WM_config.TZ_Name) - 1)
      strcpy(WM_config.TZ_Name, tempTZ.c_str());
    else
      strncpy(WM_config.TZ_Name, tempTZ.c_str(), sizeof(WM_config.TZ_Name) - 1);

    const char * TZ_Result = ESPAsync_wifiManager.getTZ(WM_config.TZ_Name);

    if (strlen(TZ_Result) < sizeof(WM_config.TZ) - 1)
      strcpy(WM_config.TZ, TZ_Result);
    else
      strncpy(WM_config.TZ, TZ_Result, sizeof(WM_config.TZ_Name) - 1);

    if ( strlen(WM_config.TZ_Name) > 0 )
    {
      LOGERROR3(F("Saving current TZ_Name ="), WM_config.TZ_Name, F(", TZ = "), WM_config.TZ);

#if ESP8266
      configTime(WM_config.TZ, "pool.ntp.org");
#else
      //configTzTime(WM_config.TZ, "pool.ntp.org" );
      configTzTime(WM_config.TZ, "time.nist.gov", "0.pool.ntp.org", "1.pool.ntp.org");
#endif
    }
    else
    {
      LOGERROR(F("Current Timezone Name is not set. Enter Config Portal to set."));
    }

#endif

    // New in v1.4.0
    ESPAsync_wifiManager.getSTAStaticIPConfig(WM_STA_IPconfig);
    //////

    saveConfigData();
  }
  else
  {
    wifiMulti.addAP(Router_SSID.c_str(), Router_Pass.c_str());
  }

  startedAt = millis();

  if (!initialConfig)
  {
    // Load stored data, the addAP ready for MultiWiFi reconnection
    if (!configDataLoaded)
      loadConfigData();

    for (uint8_t i = 0; i < NUM_WIFI_CREDENTIALS; i++)
    {
      // Don't permit NULL SSID and password len < MIN_AP_PASSWORD_SIZE (8)
      if ( (String(WM_config.WiFi_Creds[i].wifi_ssid) != "")
           && (strlen(WM_config.WiFi_Creds[i].wifi_pw) >= MIN_AP_PASSWORD_SIZE) )
      {
        LOGERROR3(F("* Add SSID = "), WM_config.WiFi_Creds[i].wifi_ssid, F(", PW = "), WM_config.WiFi_Creds[i].wifi_pw );
        wifiMulti.addAP(WM_config.WiFi_Creds[i].wifi_ssid, WM_config.WiFi_Creds[i].wifi_pw);
      }
    }

    if ( WiFi.status() != WL_CONNECTED )
    {
      Serial.println(F("ConnectMultiWiFi in setup"));

      connectMultiWiFi();
    }
  }

  Serial.print(F("After waiting "));
  Serial.print((float) (millis() - startedAt) / 1000L);
  Serial.print(F(" secs more in setup(), connection result is "));

  if (WiFi.status() == WL_CONNECTED)
  {
    Serial.print(F("connected. Local IP: "));
    Serial.println(WiFi.localIP());
  }
  else
    Serial.println(ESPAsync_wifiManager.getStatus(WiFi.status()));

  //read updated parameters
  strncpy(blynk_server, custom_blynk_server.getValue(), sizeof(blynk_server));
  strncpy(blynk_port,   custom_blynk_port.getValue(),   sizeof(blynk_port));
  strncpy(blynk_token,  custom_blynk_token.getValue(),  sizeof(blynk_token));

  strncpy(mqtt_server, custom_mqtt_server.getValue(), sizeof(mqtt_server));
  strncpy(mqtt_port, custom_mqtt_port.getValue(),     sizeof(mqtt_port));

  //save the custom parameters to FS
  if (shouldSaveConfig)
  {
    saveFileFSConfigFile();
  }

  Serial.print("Local IP = ");
  Serial.println(WiFi.localIP());
}

void loop()
{
  check_status();
}