UdpSendReceive.ino

/****************************************************************************************************************************
  UDPSendReceive.ino

  Ethernet_Generic is a library for the W5x00 Ethernet shields trying to merge the good features of
  previous Ethernet libraries

  Built by Khoi Hoang https://github.com/khoih-prog/Ethernet_Generic
 *****************************************************************************************************************************/
/*
   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"

unsigned int localPort = 1883;    //10002;  // local port to listen on

char packetBuffer[255];          // buffer to hold incoming packet
char ReplyBuffer[] = "ACK";      // a string to send back

// A UDP instance to let us send and receive packets over UDP
EthernetUDP Udp;

void setup()
{
  SerialDebug.begin(115200);

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

  SerialDebug.print("\nStart UDPSendReceive on ");
  SerialDebug.print(BOARD_NAME);
  SerialDebug.print(F(" with "));
  SerialDebug.println(SHIELD_TYPE);
  SerialDebug.println(ETHERNET_GENERIC_VERSION);

#if (USING_SPI2)
#if defined(CUR_PIN_MISO)
  ETG_LOGWARN(F("Default SPI pinout:"));
  ETG_LOGWARN1(F("MOSI:"), CUR_PIN_MOSI);
  ETG_LOGWARN1(F("MISO:"), CUR_PIN_MISO);
  ETG_LOGWARN1(F("SCK:"),  CUR_PIN_SCK);
  ETG_LOGWARN1(F("SS:"),   CUR_PIN_SS);
  ETG_LOGWARN(F("========================="));
#endif
#else
  ETG_LOGWARN(F("Default SPI pinout:"));
  ETG_LOGWARN1(F("MOSI:"), MOSI);
  ETG_LOGWARN1(F("MISO:"), MISO);
  ETG_LOGWARN1(F("SCK:"),  SCK);
  ETG_LOGWARN1(F("SS:"),   SS);
  ETG_LOGWARN(F("========================="));
#endif

#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

  ETG_LOGWARN1(F("ESP8266 setCsPin:"), USE_THIS_SS_PIN);

  // For ESP8266
  // Pin                D0(GPIO16)    D1(GPIO5)    D2(GPIO4)    D3(GPIO0)    D4(GPIO2)    D8
  // Ethernet_Generic   X                 X            X            X            X        0
  // D2 is safe to used for Ethernet_Generic libs
  //Ethernet.setCsPin (USE_THIS_SS_PIN);
  Ethernet.init (USE_THIS_SS_PIN);

#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

  ETG_LOGWARN1(F("ESP32 setCsPin:"), USE_THIS_SS_PIN);

  // 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 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   17     // For Arduino Mbed core
#else
#define USE_THIS_SS_PIN   17    // For E.Philhower core
#endif
#endif

  ETG_LOGWARN1(F("RPIPICO setCsPin:"), USE_THIS_SS_PIN);

  // 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);

#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)
  ETG_LOGWARN3(F("Board :"), BOARD_NAME, F(", setCsPin:"), USE_THIS_SS_PIN);
#else
  ETG_LOGWARN1(F("Unknown board setCsPin:"), USE_THIS_SS_PIN);
#endif

  // For other boards, to change if necessary
  Ethernet.init (USE_THIS_SS_PIN);

#endif    // defined(ESP8266)

  // 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]);

  //SPIClass SPI2(HSPI);
  //Ethernet.begin(mac[index], &SPI2);

  // Just info to know how to connect correctly
  // To change for other SPI
#if defined(CUR_PIN_MISO)
  ETG_LOGWARN(F("Currently Used SPI pinout:"));
  ETG_LOGWARN1(F("MOSI:"), CUR_PIN_MOSI);
  ETG_LOGWARN1(F("MISO:"), CUR_PIN_MISO);
  ETG_LOGWARN1(F("SCK:"),  CUR_PIN_SCK);
  ETG_LOGWARN1(F("SS:"),   CUR_PIN_SS);
  ETG_LOGWARN(F("========================="));
#else
  ETG_LOGWARN(F("Currently Used SPI pinout:"));
  ETG_LOGWARN1(F("MOSI:"), MOSI);
  ETG_LOGWARN1(F("MISO:"), MISO);
  ETG_LOGWARN1(F("SCK:"),  SCK);
  ETG_LOGWARN1(F("SS:"),   SS);
  ETG_LOGWARN(F("========================="));
#endif

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

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

  if ( (Ethernet.getChip() == w5500) || (Ethernet.getChip() == w6100) || (Ethernet.getAltChip() == w5100s) )
  {
    if (Ethernet.getChip() == w6100)
      SerialDebug.print(F("W6100 => "));
    else if (Ethernet.getChip() == w5500)
      SerialDebug.print(F("W6100 => "));
    else
      SerialDebug.print(F("W5100S => "));
    
    SerialDebug.print(F("Speed: "));
    SerialDebug.print(Ethernet.speedReport());
    SerialDebug.print(F(", Duplex: "));
    SerialDebug.print(Ethernet.duplexReport());
    SerialDebug.print(F(", Link status: "));
    SerialDebug.println(Ethernet.linkReport());
  }

  SerialDebug.println(F("\nStarting connection to server..."));
  // if you get a connection, report back via serial:
  Udp.begin(localPort);

  SerialDebug.print(F("Listening on port "));
  SerialDebug.println(localPort);
}

void loop()
{
  // if there's data available, read a packet
  int packetSize = Udp.parsePacket();

  if (packetSize)
  {
    SerialDebug.print(F("Received packet of size "));
    SerialDebug.println(packetSize);
    SerialDebug.print(F("From "));
    IPAddress remoteIp = Udp.remoteIP();
    SerialDebug.print(remoteIp);
    SerialDebug.print(F(", port "));
    SerialDebug.println(Udp.remotePort());

    // read the packet into packetBufffer
    int len = Udp.read(packetBuffer, 255);

    if (len > 0)
    {
      packetBuffer[len] = 0;
    }

    SerialDebug.println(F("Contents:"));
    SerialDebug.println(packetBuffer);

    // send a reply, to the IP address and port that sent us the packet we received
    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
    Udp.write(ReplyBuffer);
    Udp.endPacket();
  }
}