examples/AdvancedWebServer/AdvancedWebServer.ino

/****************************************************************************************************************************
  AdvancedWebServer.h - Dead simple web-server for Ethernet shields
  
  EthernetWebServer is a library for the Ethernet shields to run WebServer
  
  Based on and modified from ESP8266 https://github.com/esp8266/Arduino/releases
  Built by Khoi Hoang https://github.com/khoih-prog/EthernetWebServer
  Licensed under MIT license
  
  Copyright (c) 2015, Majenko Technologies
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without modification,
  are permitted provided that the following conditions are met:
  
  Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.
  
  Redistributions in binary form must reproduce the above copyright notice, this
  list of conditions and the following disclaimer in the documentation and/or
  other materials provided with the distribution.
  
  Neither the name of Majenko Technologies nor the names of its
  contributors may be used to endorse or promote products derived from
  this software without specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************************************************************/
/*
   The Arduino board communicates with the shield using the SPI bus. This is on digital pins 11, 12, and 13 on the Uno
   and pins 50, 51, and 52 on the Mega. On both boards, pin 10 is used as SS. On the Mega, the hardware SS pin, 53,
   is not used to select the Ethernet controller chip, but it must be kept as an output or the SPI interface won't work.
*/

#include "defines.h"

EthernetWebServer server(80);

int reqCount = 0;                // number of requests received

void handleRoot()
{
#define BUFFER_SIZE     512
  
  char temp[BUFFER_SIZE];
  int sec = millis() / 1000;
  int min = sec / 60;
  int hr = min / 60;
  int day = hr / 24;

  hr = hr % 24;

  snprintf(temp, BUFFER_SIZE - 1,
           "<html>\
<head>\
<meta http-equiv='refresh' content='5'/>\
<title>%s</title>\
<style>\
body { background-color: #cccccc; font-family: Arial, Helvetica, Sans-Serif; Color: #000088; }\
</style>\
</head>\
<body>\
<h1>Hello from %s</h1>\
<h3>running EthernetWebServer</h3>\
<h3>on %s</h3>\
<p>Uptime: %d d %02d:%02d:%02d</p>\
<img src=\"/test.svg\" />\
</body>\
</html>", BOARD_NAME, BOARD_NAME, SHIELD_TYPE, day, hr, min % 60, sec % 60);

  server.send(200, F("text/html"), temp);
}

void handleNotFound()
{
  String message = F("File Not Found\n\n");
  
  message += F("URI: ");
  message += server.uri();
  message += F("\nMethod: ");
  message += (server.method() == HTTP_GET) ? F("GET") : F("POST");
  message += F("\nArguments: ");
  message += server.args();
  message += F("\n");
  
  for (uint8_t i = 0; i < server.args(); i++)
  {
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  }
  
  server.send(404, F("text/plain"), message);
}

#define ORIGINAL_STR_LEN        2048

void drawGraph()
{
  static String out;
  static uint16_t previousStrLen = ORIGINAL_STR_LEN;

  if (out.length() == 0)
  {
    ET_LOGWARN1(F("String Len = 0, extend to"), ORIGINAL_STR_LEN);
    out.reserve(ORIGINAL_STR_LEN);
  }

  out = F( "<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" width=\"310\" height=\"150\">\n" \
           "<rect width=\"310\" height=\"150\" fill=\"rgb(250, 230, 210)\" stroke-width=\"3\" stroke=\"rgb(0, 0, 0)\" />\n" \
           "<g stroke=\"blue\">\n");

  char temp[70];
  
  int y = rand() % 130;

  for (int x = 10; x < 300; x += 10)
  {
    int y2 = rand() % 130;
    sprintf(temp, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" stroke-width=\"2\" />\n", x, 140 - y, x + 10, 140 - y2);
    out += temp;
    y = y2;
  }
  
  out += F("</g>\n</svg>\n");

  ET_LOGDEBUG1(F("String Len = "), out.length());

  if (out.length() > previousStrLen)
  {
    ET_LOGERROR3(F("String Len > "), previousStrLen, F(", extend to"), out.length() + 48);

    previousStrLen = out.length() + 48;
    
    out.reserve(previousStrLen);
  }
  else
  {
    server.send(200, "image/svg+xml", out);
  }
}

void setup()
{
  Serial.begin(115200);
  while (!Serial);

  delay(1000);

  Serial.print("\nStarting AdvancedWebServer on "); Serial.print(BOARD_NAME);
  Serial.print(F(" with ")); Serial.println(SHIELD_TYPE); 
  Serial.println(ETHERNET_WEBSERVER_VERSION);

#if USE_ETHERNET_WRAPPER

  EthernetInit();

#else

#if USE_ETHERNET_PORTENTA_H7
  ET_LOGWARN(F("======== USE_PORTENTA_H7_ETHERNET ========"));
#elif USE_NATIVE_ETHERNET
  ET_LOGWARN(F("======== USE_NATIVE_ETHERNET ========"));
#elif USE_ETHERNET_GENERIC
  ET_LOGWARN(F("=========== USE_ETHERNET_GENERIC ==========="));  
#elif USE_ETHERNET_ESP8266
  ET_LOGWARN(F("=========== USE_ETHERNET_ESP8266 ==========="));
#elif USE_ETHERNET_ENC
  ET_LOGWARN(F("=========== USE_ETHERNET_ENC ==========="));  
#else
  ET_LOGWARN(F("========================="));
#endif

#if !(USE_NATIVE_ETHERNET || USE_ETHERNET_PORTENTA_H7)
  ET_LOGWARN(F("Default SPI pinout:"));
  ET_LOGWARN1(F("MOSI:"), MOSI);
  ET_LOGWARN1(F("MISO:"), MISO);
  ET_LOGWARN1(F("SCK:"),  SCK);
  ET_LOGWARN1(F("SS:"),   SS);
  ET_LOGWARN(F("========================="));

#if defined(ESP8266)
  // For ESP8266, change for other boards if necessary
  #ifndef USE_THIS_SS_PIN
    #define USE_THIS_SS_PIN   D2    // For ESP8266
  #endif

  ET_LOGWARN1(F("ESP8266 setCsPin:"), USE_THIS_SS_PIN);

  #if ( USE_ETHERNET_GENERIC || USE_ETHERNET_ENC )
    // For ESP8266
    // Pin                D0(GPIO16)    D1(GPIO5)    D2(GPIO4)    D3(GPIO0)    D4(GPIO2)    D8
    // Ethernet           0                 X            X            X            X        0
    // Ethernet2          X                 X            X            X            X        0
    // Ethernet3          X                 X            X            X            X        0
    // EthernetLarge      X                 X            X            X            X        0
    // Ethernet_ESP8266   0                 0            0            0            0        0
    // D2 is safe to used for Ethernet, Ethernet2, Ethernet3, EthernetLarge libs
    // Must use library patch for Ethernet, EthernetLarge libraries
    Ethernet.init (USE_THIS_SS_PIN);

  #elif USE_ETHERNET3
    // Use  MAX_SOCK_NUM = 4 for 4K, 2 for 8K, 1 for 16K RX/TX buffer
    #ifndef ETHERNET3_MAX_SOCK_NUM
      #define ETHERNET3_MAX_SOCK_NUM      4
    #endif
  
    Ethernet.setCsPin (USE_THIS_SS_PIN);
    Ethernet.init (ETHERNET3_MAX_SOCK_NUM);

  #elif USE_CUSTOM_ETHERNET
  
    // You have to add initialization for your Custom Ethernet here
    // This is just an example to setCSPin to USE_THIS_SS_PIN, and can be not correct and enough
    Ethernet.init(USE_THIS_SS_PIN);
  
  #endif  //( USE_ETHERNET_GENERIC || USE_ETHERNET_ENC )

#elif defined(ESP32)

  // You can use Ethernet.init(pin) to configure the CS pin
  //Ethernet.init(10);  // Most Arduino shields
  //Ethernet.init(5);   // MKR ETH shield
  //Ethernet.init(0);   // Teensy 2.0
  //Ethernet.init(20);  // Teensy++ 2.0
  //Ethernet.init(15);  // ESP8266 with Adafruit Featherwing Ethernet
  //Ethernet.init(33);  // ESP32 with Adafruit Featherwing Ethernet

  #ifndef USE_THIS_SS_PIN
    #define USE_THIS_SS_PIN   5   //22    // For ESP32
  #endif

  ET_LOGWARN1(F("ESP32 setCsPin:"), USE_THIS_SS_PIN);

  // For other boards, to change if necessary
  #if ( USE_ETHERNET_GENERIC || USE_ETHERNET_ENC )
    // Must use library patch for Ethernet, EthernetLarge libraries
    // ESP32 => GPIO2,4,5,13,15,21,22 OK with Ethernet, Ethernet2, EthernetLarge
    // ESP32 => GPIO2,4,5,15,21,22 OK with Ethernet3
  
    //Ethernet.setCsPin (USE_THIS_SS_PIN);
    Ethernet.init (USE_THIS_SS_PIN);
  
  #elif USE_ETHERNET3
    // Use  MAX_SOCK_NUM = 4 for 4K, 2 for 8K, 1 for 16K RX/TX buffer
    #ifndef ETHERNET3_MAX_SOCK_NUM
      #define ETHERNET3_MAX_SOCK_NUM      4
    #endif
  
    Ethernet.setCsPin (USE_THIS_SS_PIN);
    Ethernet.init (ETHERNET3_MAX_SOCK_NUM);

  #elif USE_CUSTOM_ETHERNET
  
    // You have to add initialization for your Custom Ethernet here
    // This is just an example to setCSPin to USE_THIS_SS_PIN, and can be not correct and enough
    Ethernet.init(USE_THIS_SS_PIN); 
  
  #endif  //( USE_ETHERNET_GENERIC || USE_ETHERNET_ENC )

#elif ETHERNET_USE_RPIPICO

  pinMode(USE_THIS_SS_PIN, OUTPUT);
  digitalWrite(USE_THIS_SS_PIN, HIGH);
  
  // ETHERNET_USE_RPIPICO, use default SS = 5 or 17
  #ifndef USE_THIS_SS_PIN
    #if defined(ARDUINO_ARCH_MBED)
      #define USE_THIS_SS_PIN   5     // For Arduino Mbed core
    #else  
      #define USE_THIS_SS_PIN   17    // For E.Philhower core
    #endif
  #endif

  ET_LOGWARN1(F("RPIPICO setCsPin:"), USE_THIS_SS_PIN);

  // For other boards, to change if necessary
  #if ( USE_ETHERNET_GENERIC || USE_ETHERNET_ENC )
    // Must use library patch for Ethernet, EthernetLarge libraries
    // For RPI Pico using Arduino Mbed RP2040 core
    // SCK: GPIO2,  MOSI: GPIO3, MISO: GPIO4, SS/CS: GPIO5
    // For RPI Pico using E. Philhower RP2040 core
    // SCK: GPIO18,  MOSI: GPIO19, MISO: GPIO16, SS/CS: GPIO17
    // Default pin 5/17 to SS/CS
  
    //Ethernet.setCsPin (USE_THIS_SS_PIN);
    Ethernet.init (USE_THIS_SS_PIN);
  
  #elif USE_ETHERNET3
    // Use  MAX_SOCK_NUM = 4 for 4K, 2 for 8K, 1 for 16K RX/TX buffer
    #ifndef ETHERNET3_MAX_SOCK_NUM
      #define ETHERNET3_MAX_SOCK_NUM      4
    #endif
  
    Ethernet.setCsPin (USE_THIS_SS_PIN);
    Ethernet.init (ETHERNET3_MAX_SOCK_NUM);
    
  #endif    //( USE_ETHERNET_GENERIC || USE_ETHERNET_ENC )

#else   //defined(ESP8266)
  // unknown board, do nothing, use default SS = 10
  #ifndef USE_THIS_SS_PIN
    #define USE_THIS_SS_PIN   10    // For other boards
  #endif

  #if defined(BOARD_NAME)
    ET_LOGWARN3(F("Board :"), BOARD_NAME, F(", setCsPin:"), USE_THIS_SS_PIN);
  #else
    ET_LOGWARN1(F("Unknown board setCsPin:"), USE_THIS_SS_PIN);
  #endif

  // For other boards, to change if necessary
  #if ( USE_ETHERNET_GENERIC || USE_ETHERNET_ENC || USE_NATIVE_ETHERNET )
    // Must use library patch for Ethernet, Ethernet2, EthernetLarge libraries
  
    Ethernet.init (USE_THIS_SS_PIN);
  
  #elif USE_CUSTOM_ETHERNET
  
    // You have to add initialization for your Custom Ethernet here
    // This is just an example to setCSPin to USE_THIS_SS_PIN, and can be not correct and enough
    Ethernet.init(USE_THIS_SS_PIN);
    
  #endif  //( USE_ETHERNET_GENERIC || USE_ETHERNET_ENC )

#endif    // defined(ESP8266)

#endif    // #if !(USE_NATIVE_ETHERNET)


#endif  //USE_ETHERNET_WRAPPER


  // start the ethernet connection and the server:
  // Use DHCP dynamic IP and random mac
  uint16_t index = millis() % NUMBER_OF_MAC;
  // Use Static IP
  //Ethernet.begin(mac[index], ip);
  Ethernet.begin(mac[index]);

#if !(USE_NATIVE_ETHERNET || USE_ETHERNET_PORTENTA_H7)
  #if defined( ESP32 )
    // Just info to know how to connect correctly
    // To change for other SPI
    Serial.println("=========================");
    Serial.println("Currently Used SPI pinout:");
    Serial.print("MOSI:");
    Serial.println(PIN_MOSI);
    Serial.print("MISO:");
    Serial.println(PIN_MISO);
    Serial.print("SCK:");
    Serial.println(PIN_SCK);
    Serial.print("SS:");
    Serial.println(USE_THIS_SS_PIN);
    Serial.println(F("========================="));
  #else
    // Just info to know how to connect correctly
    Serial.println("=========================");
    Serial.println("Currently Used SPI pinout:");
    Serial.print("MOSI:");
    Serial.println(MOSI);
    Serial.print("MISO:");
    Serial.println(MISO);
    Serial.print("SCK:");
    Serial.println(SCK);
    Serial.print("SS:");
    Serial.println(SS);
  #endif
  
  Serial.println(F("========================="));

#elif (USE_ETHERNET_PORTENTA_H7)
  if (Ethernet.hardwareStatus() == EthernetNoHardware) 
  {
    Serial.println("No Ethernet found. Stay here forever");
    
    while (true) 
    {
      delay(1); // do nothing, no point running without Ethernet hardware
    }
  }
  
  if (Ethernet.linkStatus() == LinkOFF) 
  {
    Serial.println("Not connected Ethernet cable");
  }
#endif

  Serial.print(F("Using mac index = "));
  Serial.println(index);

  Serial.print(F("Connected! IP address: "));
  Serial.println(Ethernet.localIP());

  server.on(F("/"), handleRoot);
  server.on(F("/test.svg"), drawGraph);
  server.on(F("/inline"), []()
  {
    server.send(200, F("text/plain"), F("This works as well"));
  });

  server.onNotFound(handleNotFound);
  server.begin();

  Serial.print(F("HTTP EthernetWebServer is @ IP : "));
  Serial.println(Ethernet.localIP());
}

void heartBeatPrint()
{
  static int num = 1;

  Serial.print(F("."));

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

void check_status()
{
  static unsigned long checkstatus_timeout = 0;

#define STATUS_CHECK_INTERVAL     10000L

  // Send status report every STATUS_REPORT_INTERVAL (60) seconds: we don't need to send updates frequently if there is no status change.
  if ((millis() > checkstatus_timeout) || (checkstatus_timeout == 0))
  {
    heartBeatPrint();
    checkstatus_timeout = millis() + STATUS_CHECK_INTERVAL;
  }
}

void loop()
{
  server.handleClient();
  check_status();
}