ConfigPortalParamsOnSwitch.ino

/****************************************************************************************************************************
  ConfigPortalParamsOnSwitch.ino
  For Ethernet shields using ESP32_W5500 (ESP32 + LwIP W5500)

  WebServer_ESP32_W5500 is a library for the ESP32 with Ethernet W5500 to run WebServer

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

  Built by Khoi Hoang https://github.com/khoih-prog/ESP32_W5500_Manager
  Licensed under MIT license
 *****************************************************************************************************************************/
/****************************************************************************************************************************
   This example will open a configuration portal when a predetermined button is pressed

   You then can modify ConfigPortal Parameters.
   This example will open a configuration portal when no configuration has been previously entered or when a button is pushed.

   Also in this example, a configurable password is required to connect to the configuration portal
   network. This is inconvenient but means that only those who know the password or those
   already connected to the target network can access the configuration portal and
   the network credentials will be sent from the browser over an encrypted connection and
   can not be read by observers.
 *****************************************************************************************************************************/

#if !( defined(ESP32) )
  #error This code is intended to run on the (ESP32 + LwIP W5500) platform! Please check your Tools->Board setting.
#endif

// Use from 0 to 4. Higher number, more debugging messages and memory usage.
#define _ESP32_ETH_MGR_LOGLEVEL_    4

// 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

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

// Enter a MAC address and IP address for your controller below.
#define NUMBER_OF_MAC      20

byte mac[][NUMBER_OF_MAC] =
{
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x01 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x02 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x03 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x04 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x05 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x06 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x07 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x08 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x09 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0A },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0B },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0C },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0D },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0E },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0F },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x10 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x11 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x12 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x13 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x14 },
};

// Select the IP address according to your local network
//IPAddress myIP(192, 168, 2, 232);
//IPAddress myGW(192, 168, 2, 1);
//IPAddress mySN(255, 255, 255, 0);

// Google DNS Server IP
//IPAddress myDNS(8, 8, 8, 8);

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

// Optional values to override default settings
// Don't change unless you know what you're doing
//#define ETH_SPI_HOST        SPI3_HOST
//#define SPI_CLOCK_MHZ       25

// Must connect INT to GPIOxx or not working
//#define INT_GPIO            4

//#define MISO_GPIO           19
//#define MOSI_GPIO           23
//#define SCK_GPIO            18
//#define CS_GPIO             5

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

#include <FS.h>
// Now support ArduinoJson 6.0.0+ ( tested with v6.14.1 )
#include <ArduinoJson.h>      // get it from https://arduinojson.org/ or install via Arduino library manager

//For ESP32, To use ESP32 Dev Module, QIO, Flash 4MB/80MHz, Upload 921600
//Ported to ESP32
#include <esp_wifi.h>

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

// 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 (_ESP32_ETH_MGR_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 (_ESP32_ETH_MGR_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_ON            HIGH
#define LED_OFF           LOW

//See file .../hardware/espressif/esp32/variants/(esp32|doitESP32devkitV1)/pins_arduino.h
#define LED_BUILTIN       2         // Pin D2 mapped to pin GPIO2/ADC12 of ESP32, control on-board LED
#define PIN_LED           2         // Pin D2 mapped to pin GPIO2/ADC12 of ESP32, control on-board LED

#define PIN_D0            0         // Pin D0 mapped to pin GPIO0/BOOT/ADC11/TOUCH1 of ESP32
#define PIN_D1            1         // Pin D1 mapped to pin GPIO1/TX0 of ESP32
#define PIN_D2            2         // Pin D2 mapped to pin GPIO2/ADC12/TOUCH2 of ESP32
#define PIN_D3            3         // Pin D3 mapped to pin GPIO3/RX0 of ESP32
#define PIN_D4            4         // Pin D4 mapped to pin GPIO4/ADC10/TOUCH0 of ESP32
#define PIN_D5            5         // Pin D5 mapped to pin GPIO5/SPISS/VSPI_SS of ESP32
#define PIN_D6            6         // Pin D6 mapped to pin GPIO6/FLASH_SCK of ESP32
#define PIN_D7            7         // Pin D7 mapped to pin GPIO7/FLASH_D0 of ESP32
#define PIN_D8            8         // Pin D8 mapped to pin GPIO8/FLASH_D1 of ESP32
#define PIN_D9            9         // Pin D9 mapped to pin GPIO9/FLASH_D2 of ESP32

#define PIN_D10           10        // Pin D10 mapped to pin GPIO10/FLASH_D3 of ESP32
#define PIN_D11           11        // Pin D11 mapped to pin GPIO11/FLASH_CMD of ESP32
#define PIN_D12           12        // Pin D12 mapped to pin GPIO12/HSPI_MISO/ADC15/TOUCH5/TDI of ESP32
#define PIN_D13           13        // Pin D13 mapped to pin GPIO13/HSPI_MOSI/ADC14/TOUCH4/TCK of ESP32
#define PIN_D14           14        // Pin D14 mapped to pin GPIO14/HSPI_SCK/ADC16/TOUCH6/TMS of ESP32
#define PIN_D15           15        // Pin D15 mapped to pin GPIO15/HSPI_SS/ADC13/TOUCH3/TDO of ESP32
#define PIN_D16           16        // Pin D16 mapped to pin GPIO16/TX2 of ESP32
#define PIN_D17           17        // Pin D17 mapped to pin GPIO17/RX2 of ESP32     
#define PIN_D18           18        // Pin D18 mapped to pin GPIO18/VSPI_SCK of ESP32
#define PIN_D19           19        // Pin D19 mapped to pin GPIO19/VSPI_MISO of ESP32

#define PIN_D21           21        // Pin D21 mapped to pin GPIO21/SDA of ESP32
#define PIN_D22           22        // Pin D22 mapped to pin GPIO22/SCL of ESP32
#define PIN_D23           23        // Pin D23 mapped to pin GPIO23/VSPI_MOSI of ESP32
#define PIN_D24           24        // Pin D24 mapped to pin GPIO24 of ESP32
#define PIN_D25           25        // Pin D25 mapped to pin GPIO25/ADC18/DAC1 of ESP32
#define PIN_D26           26        // Pin D26 mapped to pin GPIO26/ADC19/DAC2 of ESP32
#define PIN_D27           27        // Pin D27 mapped to pin GPIO27/ADC17/TOUCH7 of ESP32     

#define PIN_D32           32        // Pin D32 mapped to pin GPIO32/ADC4/TOUCH9 of ESP32
#define PIN_D33           33        // Pin D33 mapped to pin GPIO33/ADC5/TOUCH8 of ESP32
#define PIN_D34           34        // Pin D34 mapped to pin GPIO34/ADC6 of ESP32

//Only GPIO pin < 34 can be used as output. Pins >= 34 can be only inputs
//See .../cores/esp32/esp32-hal-gpio.h/c
//#define digitalPinIsValid(pin)          ((pin) < 40 && esp32_gpioMux[(pin)].reg)
//#define digitalPinCanOutput(pin)        ((pin) < 34 && esp32_gpioMux[(pin)].reg)
//#define digitalPinToRtcPin(pin)         (((pin) < 40)?esp32_gpioMux[(pin)].rtc:-1)
//#define digitalPinToAnalogChannel(pin)  (((pin) < 40)?esp32_gpioMux[(pin)].adc:-1)
//#define digitalPinToTouchChannel(pin)   (((pin) < 40)?esp32_gpioMux[(pin)].touch:-1)
//#define digitalPinToDacChannel(pin)     (((pin) == 25)?0:((pin) == 26)?1:-1)

#define PIN_D35           35        // Pin D35 mapped to pin GPIO35/ADC7 of ESP32
#define PIN_D36           36        // Pin D36 mapped to pin GPIO36/ADC0/SVP of ESP32
#define PIN_D39           39        // Pin D39 mapped to pin GPIO39/ADC3/SVN of ESP32

#define PIN_RX0            3        // Pin RX0 mapped to pin GPIO3/RX0 of ESP32
#define PIN_TX0            1        // Pin TX0 mapped to pin GPIO1/TX0 of ESP32

#define PIN_SCL           22        // Pin SCL mapped to pin GPIO22/SCL of ESP32
#define PIN_SDA           21        // Pin SDA mapped to pin GPIO21/SDA of ESP32   

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

/* Trigger for inititating config mode is Pin D3 and also flash button on NodeMCU
   Flash button is convenient to use but if it is pressed it will stuff up the serial port device driver
   until the computer is rebooted on windows machines.
*/
const int TRIGGER_PIN = PIN_D0;   // Pin D0 mapped to pin GPIO0/BOOT/ADC11/TOUCH1 of ESP32
/*
   Alternative trigger pin. Needs to be connected to a button to use this pin. It must be a momentary connection
   not connected permanently to ground. Either trigger pin will work.
*/
#if ( ARDUINO_ESP32C3_DEV )
  const int TRIGGER_PIN2  = PIN_D8;       // Pin D8 mapped to pin GPIO8/FLASH_D1 of ESP32
#else
  const int TRIGGER_PIN2  = PIN_D25;      // Pin D25 mapped to pin GPIO25/ADC18/DAC1 of ESP32
#endif

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

const char* JSON_CONFIG_FILE = "/ConfigSW.json";

// You only need to format the filesystem once
//#define FORMAT_FILESYSTEM       true
#define FORMAT_FILESYSTEM         false

// Variables

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

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

EthConfig         Ethconfig;

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

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

// Indicates whether ESP has credentials saved from previous session
bool initialConfig = false;

// 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 <ESP32_W5500_Manager.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_ETH_MANAGER_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 (_ESP32_ETH_MGR_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 (_ESP32_ETH_MGR_LOGLEVEL_ > 3)
    #warning Using static IP
  #endif

  IPAddress stationIP   = IPAddress(192, 168, 2, 232);
  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);

#include <ESP32_W5500_Manager.h>               //https://github.com/khoih-prog/ESP32_W5500_Manager

#define HTTP_PORT     80

///////////////////////////////////////////
/******************************************
   // Defined in ESP32_W5500_Manager.hpp
  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
  }  ETH_STA_IPConfig;
******************************************/

ETH_STA_IPConfig EthSTA_IPconfig;

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

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

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

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

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

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

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

#if USE_ESP_ETH_MANAGER_NTP
void printLocalTime()
{
  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

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

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

  if (ESP32_W5500_isConnected())
    Serial.print(F("H"));        // H means connected to Ethernet
  else
    Serial.print(F("F"));        // F means not connected to Ethernet

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

#endif
}

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

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

  static ulong current_millis;

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

#define LED_INTERVAL          2000L

  current_millis = millis();

  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("LoadCfgFile "));

  memset((void *) &Ethconfig,       0, sizeof(Ethconfig));
  memset((void *) &EthSTA_IPconfig, 0, sizeof(EthSTA_IPconfig));

  if (file)
  {
    file.readBytes((char *) &Ethconfig,   sizeof(Ethconfig));
    file.readBytes((char *) &EthSTA_IPconfig, sizeof(EthSTA_IPconfig));
    file.close();

    LOGERROR(F("OK"));

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

      return false;
    }

    displayIPConfigStruct(EthSTA_IPconfig);

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

    return false;
  }
}

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

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

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

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

    displayIPConfigStruct(EthSTA_IPconfig);

    file.write((uint8_t*) &EthSTA_IPconfig, sizeof(EthSTA_IPconfig));
    file.close();

    LOGERROR(F("OK"));
  }
  else
  {
    LOGERROR(F("failed"));
  }
}

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

bool readConfigFile()
{
  // this opens the config file in read-mode
  File f = FileFS.open(JSON_CONFIG_FILE, "r");

  if (!f)
  {
    Serial.println(F("Configuration file not found"));

    return false;
  }
  else
  {
    // we could open the file
    size_t size = f.size();
    // Allocate a buffer to store contents of the file.
    std::unique_ptr<char[]> buf(new char[size + 1]);

    // Read and store file contents in buf
    f.readBytes(buf.get(), size);
    // Closing file
    f.close();
    // Using dynamic JSON buffer which is not the recommended memory model, but anyway
    // See https://github.com/bblanchon/ArduinoJson/wiki/Memory%20model

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

    if ( deserializeError )
    {
      Serial.println(F("JSON parseObject() failed"));

      return false;
    }

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

    // Test if parsing succeeds.
    if (!json.success())
    {
      Serial.println(F("JSON parseObject() failed"));
      return false;
    }

    json.printTo(Serial);
#endif
  }

  Serial.println(F("\nConfig file was successfully parsed"));

  return true;
}

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

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

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

  // Open file for writing
  File f = FileFS.open(JSON_CONFIG_FILE, "w");

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

    return false;
  }

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

  f.close();

  Serial.println(F("\nConfig file was successfully saved"));

  return true;
}

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

void beginEthernet()
{
  LOGWARN(F("Default SPI pinout:"));
  LOGWARN1(F("SPI_HOST:"), ETH_SPI_HOST);
  LOGWARN1(F("MOSI:"), MOSI_GPIO);
  LOGWARN1(F("MISO:"), MISO_GPIO);
  LOGWARN1(F("SCK:"),  SCK_GPIO);
  LOGWARN1(F("CS:"),   CS_GPIO);
  LOGWARN1(F("INT:"),  INT_GPIO);
  LOGWARN1(F("SPI Clock (MHz):"), SPI_CLOCK_MHZ);
  LOGWARN(F("========================="));

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

  // To be called before ETH.begin()
  ESP32_W5500_onEvent();

  // start the ethernet connection and the server:
  // Use DHCP dynamic IP and random mac
  uint16_t index = millis() % NUMBER_OF_MAC;

  //bool begin(int MISO_GPIO, int MOSI_GPIO, int SCLK_GPIO, int CS_GPIO, int INT_GPIO, int SPI_CLOCK_MHZ,
  //           int SPI_HOST, uint8_t *W5500_Mac = W5500_Default_Mac);
  //ETH.begin( MISO_GPIO, MOSI_GPIO, SCK_GPIO, CS_GPIO, INT_GPIO, SPI_CLOCK_MHZ, ETH_SPI_HOST );
  ETH.begin( MISO_GPIO, MOSI_GPIO, SCK_GPIO, CS_GPIO, INT_GPIO, SPI_CLOCK_MHZ, ETH_SPI_HOST, mac[index] );
}

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

void initEthernet()
{
#if !( USE_DHCP_IP )
  displayIPConfigStruct(EthSTA_IPconfig);

  // Static IP, leave without this line to get IP via DHCP
  //bool config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, IPAddress dns1 = 0, IPAddress dns2 = 0);
  //ETH.config(stationIP, gatewayIP, netMask, dns1IP, dns2IP);
  ETH.config(EthSTA_IPconfig._sta_static_ip, EthSTA_IPconfig._sta_static_gw, EthSTA_IPconfig._sta_static_sn,
             EthSTA_IPconfig._sta_static_dns1);
#endif

  ESP32_W5500_waitForConnect();
}

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

// Setup function
void setup()
{
  // Initialize the LED digital pin as an output.
  pinMode(LED_BUILTIN, OUTPUT);

  // Initialize trigger pins
  pinMode(TRIGGER_PIN, INPUT_PULLUP);
  pinMode(TRIGGER_PIN2, INPUT_PULLUP);

  // Put your setup code here, to run once
  Serial.begin(115200);

  while (!Serial && millis() < 5000);

  delay(200);

  Serial.print(F("\nStarting ConfigPortalParamsOnSwitch using "));
  Serial.print(FS_Name);
  Serial.print(F(" on "));
  Serial.print(ARDUINO_BOARD);
  Serial.print(F(" with "));
  Serial.println(SHIELD_TYPE);
  Serial.println(ESP32_W5500_MANAGER_VERSION);

  Serial.setDebugOutput(false);

  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);
      }
    }
  }

  if (!readConfigFile())
  {
    Serial.println(F("Failed to read configuration file, using default values"));
  }

  unsigned long startedAt = millis();

  beginEthernet();

  initSTAIPConfigStruct(EthSTA_IPconfig);

  //Local intialization. Once its business is done, there is no need to keep it around
  // Use this to default DHCP hostname to ESP32-XXXXXX
  //ESP32_W5500_Manager ESP32_W5500_manager;
  // Use this to personalize DHCP hostname (RFC952 conformed)
  ESP32_W5500_Manager ESP32_W5500_manager("CP-ParamsOnSW");

#if !USE_DHCP_IP
  // Set (static IP, Gateway, Subnetmask, DNS1 and DNS2) or (IP, Gateway, Subnetmask)
  ESP32_W5500_manager.setSTAStaticIPConfig(EthSTA_IPconfig);
#endif

#if USING_CORS_FEATURE
  ESP32_W5500_manager.setCORSHeader("Your Access-Control-Allow-Origin");
#endif

  bool configDataLoaded = false;

  if (loadConfigData())
  {
    configDataLoaded = true;

    //If no access point name has been previously entered disable timeout.
    ESP32_W5500_manager.setConfigPortalTimeout(120);

    Serial.println(F("Got stored Credentials. Timeout 120s for Config Portal"));

#if USE_ESP_ETH_MANAGER_NTP

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

      //configTzTime(Ethconfig.TZ, "pool.ntp.org" );
      configTzTime(Ethconfig.TZ, "time.nist.gov", "0.pool.ntp.org", "1.pool.ntp.org");
    }
    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;
  }

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

  // Connect ETH now if using STA
  initEthernet();

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

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

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

    digitalWrite(LED_BUILTIN, LED_ON); // Turn led on as we are in configuration mode.

    //sets timeout in seconds until configuration portal gets turned off.
    //If not specified device will remain in configuration mode until
    //switched off via webserver or device is restarted.
    //ESP32_W5500_manager.setConfigPortalTimeout(600);

    // Starts an access point
    if (!ESP32_W5500_manager.startConfigPortal())
      Serial.println(F("Not connected to ETH network but continuing anyway."));
    else
    {
      Serial.println(F("ETH network connected...yeey :)"));
    }

#if USE_ESP_ETH_MANAGER_NTP
    String tempTZ   = ESP32_W5500_manager.getTimezoneName();

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

    const char * TZ_Result = ESP32_W5500_manager.getTZ(Ethconfig.TZ_Name);

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

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

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

#endif

    ESP32_W5500_manager.getSTAStaticIPConfig(EthSTA_IPconfig);

    saveConfigData();
  }

  digitalWrite(LED_BUILTIN, LED_OFF); // Turn led off as we are not in configuration mode.

  startedAt = millis();

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

  if (ESP32_W5500_isConnected())
  {
    Serial.print(F("connected. Local IP: "));
    Serial.println(ETH.localIP());
  }
}

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

void loop()
{
  // is configuration portal requested?
  if ((digitalRead(TRIGGER_PIN) == LOW) || (digitalRead(TRIGGER_PIN2) == LOW))
  {
    Serial.println(F("\nConfiguration portal requested."));
    digitalWrite(LED_BUILTIN, LED_ON); // turn the LED on by making the voltage LOW to tell us we are in configuration mode.

    //Local intialization. Once its business is done, there is no need to keep it around
    // Use this to default DHCP hostname to ESP32-XXXXXX
    //ESP32_W5500_Manager ESP32_W5500_manager;
    // Use this to personalize DHCP hostname (RFC952 conformed)
    ESP32_W5500_Manager ESP32_W5500_manager("CP-ParamsOnSW");

    //Check if there is stored credentials.
    //If not found, device will remain in configuration mode until switched off via webserver.
    Serial.println(F("Opening configuration portal"));

    if (loadConfigData())
    {
      //If no access point name has been previously entered disable timeout.
      ESP32_W5500_manager.setConfigPortalTimeout(120);

      Serial.println(F("Got stored Credentials. Timeout 120s for Config Portal"));
    }
    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;
    }

    // Extra parameters to be configured
    // After connecting, parameter.getValue() will get you the configured value
    // Format: <ID> <Placeholder text> <default value> <length> <custom HTML> <label placement>

    // Sets timeout in seconds until configuration portal gets turned off.
    // If not specified device will remain in configuration mode until
    // switched off via webserver or device is restarted.
    //ESP32_W5500_manager.setConfigPortalTimeout(120);

#if !USE_DHCP_IP
#if USE_CONFIGURABLE_DNS
    // Set static IP, Gateway, Subnetmask, DNS1 and DNS2
    ESP32_W5500_manager.setSTAStaticIPConfig(stationIP, gatewayIP, netMask, dns1IP, dns2IP);
#else
    // Set static IP, Gateway, Subnetmask, Use auto DNS1 and DNS2.
    ESP32_W5500_manager.setSTAStaticIPConfig(stationIP, gatewayIP, netMask);
#endif
#endif

#if USING_CORS_FEATURE
    ESP32_W5500_manager.setCORSHeader("Your Access-Control-Allow-Origin");
#endif

    // Start an access point and goes into a blocking loop awaiting configuration.
    // Once the user leaves the portal with the exit button
    // processing will continue

    if (!ESP32_W5500_manager.startConfigPortal())
      Serial.println(F("Not connected to ETH network but continuing anyway."));
    else
    {
      Serial.println(F("ETH network connected...yeey :)"));
      Serial.print(F("Local IP: "));
      Serial.println(ETH.localIP());
    }

#if USE_ESP_ETH_MANAGER_NTP
    String tempTZ   = ESP32_W5500_manager.getTimezoneName();

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

    const char * TZ_Result = ESP32_W5500_manager.getTZ(Ethconfig.TZ_Name);

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

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

#if ESP8266
      configTime(Ethconfig.TZ, "pool.ntp.org");
#else
      //configTzTime(Ethconfig.TZ, "pool.ntp.org" );
      configTzTime(Ethconfig.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

    ESP32_W5500_manager.getSTAStaticIPConfig(EthSTA_IPconfig);

    saveConfigData();

    // Getting posted form values and overriding local variables parameters
    // Config file is written regardless the connection state

    // Writing JSON config file to flash for next boot
    writeConfigFile();

    digitalWrite(LED_BUILTIN, LED_OFF); // Turn LED off as we are not in configuration mode.
  }

  // Put your main code here, to run repeatedly...
  check_status();
}