[Arduino IDE demo source code for KC868-A8S]--#05-KC868-A8S_LAN8720_UDP_code

Code:
/*KC868-A8S LAN8720_UDP communication code*/



#include <ETH.h> 

#include <WiFiUdp.h> 



#define ETH_ADDR        0

#define ETH_POWER_PIN  -1

#define ETH_MDC_PIN    23

#define ETH_MDIO_PIN   18   

#define ETH_TYPE       ETH_PHY_LAN8720

#define ETH_CLK_MODE   ETH_CLOCK_GPIO17_OUT



WiFiUDP Udp;                      //Create UDP object

unsigned int localUdpPort = 4196; //local port



/*Set the default IP address to 192.168.1.200  */

/*you can change the default IP address*/

IPAddress local_ip(192, 168, 1, 200); 

IPAddress gateway(192, 168, 1, 1);

IPAddress subnet(255, 255, 255, 0);

IPAddress dns(192, 168, 1, 1);



void setup()

{

  Serial.begin(115200);

  Serial.println();

   

  ETH.begin(ETH_ADDR, ETH_POWER_PIN, ETH_MDC_PIN, ETH_MDIO_PIN, ETH_TYPE, ETH_CLK_MODE); //start with ETH



  // write confir for static IP, gateway,subnet,dns1,dns2

  if (ETH.config(local_ip, gateway, subnet, dns, dns) == false) {

    Serial.println("LAN8720 Configuration failed.");

  }else{Serial.println("LAN8720 Configuration success.");}

  

  Serial.println("Connected");

  Serial.print("IP Address:");

  Serial.println(ETH.localIP());



  Udp.begin(localUdpPort); //begin UDP listener

}



void loop()

{

  int packetSize = Udp.parsePacket(); //get package size

  if (packetSize)                     //if have received data

  {

    char buf[packetSize];

    Udp.read(buf, packetSize); //read current data



    Serial.println();

    Serial.print("Received: ");

    Serial.println(buf);

    Serial.print("From IP: ");

    Serial.println(Udp.remoteIP());

    Serial.print("From Port: ");

    Serial.println(Udp.remotePort());



    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort()); //ready to send data

    Udp.print("Received: ");    

    Udp.write((const uint8_t*)buf, packetSize); //copy data to sender buffer

    Udp.endPacket();            //send data

  }

}