examples/Generic/Ethernet/SAMD/SAMD_SimpleServer/SAMD_SimpleServer.ino

/****************************************************************************************************************************
  SAMD_SimpleServer.ino
  
  For all Generic boards such as ESP8266, ESP32, WT32_ETH01, SAMD21/SAMD51, nRF52, STM32F/L/H/G/WB/MP1,Teensy, Portenta_H7
  with WiFiNINA, ESP8266/ESP32 WiFi, ESP8266/ESP32-AT, W5x00, ENC28J60, Native-Ethernet, Portenta Ethernet/WiFi
  
  DDNS_Generic is a library to automatically add port mappings to router using UPnP SSDP
  (Simple Service Discovery Protocol) in order to provide access to the local Web Services from the Internet.
  
  Based on and modified from Ofek Pearl's TinyUPnP Library (https://github.com/ofekp/TinyUPnP)
  Built by Khoi Hoang https://github.com/khoih-prog/UPnP_Generic
  Licensed under GPL-3.0 license
 *****************************************************************************************************************************/
/*
  Note: This example uses the DDNS_Generic library (https://github.com/khoih-prog/DDNS_Generic)
        You can access this WebServer by either localIP:LISTEN_PORT such as 192.169.2.100:5990
        or DDNS_Host:LISTEN_PORT, such as account.duckdns.org:5990
*/

#include "defines.h"

#define UPNP_USING_ETHERNET     true

#include <UPnP_Generic.h>

#define LISTEN_PORT         5990
#define LEASE_DURATION      36000  // seconds
#define FRIENDLY_NAME       "SAMD-W5X00"  // this name will appear in your router port forwarding section

UPnP* uPnP;

EthernetWebServer server(LISTEN_PORT);

const int led = 13;

void onUpdateCallback(const char* oldIP, const char* newIP)
{
  Serial.print(F("DDNSGeneric - IP Change Detected: oldIP = "));
  Serial.print(oldIP);
  Serial.print(F(", newIP = "));
  Serial.println(newIP);
}

void handleRoot()
{
#define BUFFER_SIZE     400
  
  digitalWrite(led, 1);
  char temp[BUFFER_SIZE];
  int sec = millis() / 1000;
  int min = sec / 60;
  int hr = min / 60;
  int day = hr / 24;
  
  hr = hr % 24;

  snprintf_P(temp, BUFFER_SIZE - 1,
           PSTR("<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 UPnP_Generic & DDNS_Generic</h3>\
<h3>on %s</h3>\
<p>Uptime: %d d %02d:%02d:%02d</p>\
</body>\
</html>"), BOARD_NAME, BOARD_NAME, SHIELD_TYPE, day, hr, min % 60, sec % 60);

  server.send(200, F("text/html"), temp);
  digitalWrite(led, 0);
}

void handleNotFound() 
{
  digitalWrite(led, 1);
  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);
  digitalWrite(led, 0);
}

void initEthernet()
{
  #if USE_ETHERNET_GENERIC
  ET_LOGWARN(F("=========== USE_ETHERNET_GENERIC ==========="));  
#elif USE_ETHERNET_ENC
  ET_LOGWARN(F("=========== USE_ETHERNET_ENC ==========="));
#elif USE_UIP_ETHERNET
  ET_LOGWARN(F("=========== USE_UIP_ETHERNET ==========="));  
#else
  ET_LOGWARN(F("=========== USE_CUSTOM_ETHERNET ==========="));
#endif

  ET_LOGWARN3(F("Board :"), BOARD_NAME, F(", setCsPin:"), USE_THIS_SS_PIN);

  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("========================="));

  // For other boards, to change if necessary
  #if ( USE_ETHERNET_GENERIC || USE_ETHERNET_ENC )
    // 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 )
  
  // 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]);
}

#define RETRY_TIMES     4

void setup() 
{
  pinMode(led, OUTPUT);
  digitalWrite(led, 0);
  
  Serial.begin(115200);
  while (!Serial && millis() < 5000);

  Serial.print("\nStart SAMD_SimpleServer on "); Serial.print(BOARD_NAME);
  Serial.print(" using "); Serial.println(SHIELD_TYPE);
  Serial.println(UPNP_GENERIC_VERSION);
  
  initEthernet();

  IPAddress localIP = Ethernet.localIP();

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

  ////////////////
  
  DDNSGeneric.service("duckdns");    // Enter your DDNS Service Name - "duckdns" / "noip"

  /*
    For DDNS Providers where you get a token:
    DDNSGeneric.client("domain", "token");

    For DDNS Providers where you get username and password: ( Leave the password field empty "" if not required )
    DDNSGeneric.client("domain", "username", "password");
  */
  DDNSGeneric.client("account.duckdns.org", "12345678-1234-1234-1234-123456789012");

  DDNSGeneric.onUpdate(onUpdateCallback);

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

  uPnP = new UPnP(30000);  // -1 means blocking, preferably, use a timeout value (ms)

  if (uPnP)
  {
    uPnP->addPortMappingConfig(localIP, LISTEN_PORT, RULE_PROTOCOL_TCP, LEASE_DURATION, FRIENDLY_NAME);

    bool portMappingAdded = false;

#define RETRY_TIMES     4
    int retries = 0;

    while (!portMappingAdded && (retries < RETRY_TIMES))
    {
      Serial.println("Add Port Forwarding, Try # " + String(++retries));

      int result = uPnP->commitPortMappings();

      portMappingAdded = ( (result == PORT_MAP_SUCCESS) || (result == ALREADY_MAPPED) );

      //Serial.println("commitPortMappings result =" + String(result));

      if (!portMappingAdded)
      {
        // for debugging, you can see this in your router too under forwarding or UPnP
        //uPnP->printAllPortMappings();
        //Serial.println(F("This was printed because adding the required port mapping failed"));
        if (retries < RETRY_TIMES)
          delay(10000);  // 10 seconds before trying again
      }
    }

    uPnP->printAllPortMappings();

    Serial.println(F("\nUPnP done"));
  }
  
  server.on(F("/"), handleRoot);

  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.print(localIP); 
  Serial.print(F(", port = "));
  Serial.println(LISTEN_PORT);
}

void loop() 
{
  DDNSGeneric.update(300000);

  uPnP->updatePortMappings(600000);  // 10 minutes

  server.handleClient();
}