Arduino: Ethernet UDP Send Receive String

Sumber: https://www.arduino.cc/en/Tutorial/UDPSendReceiveString

Pada contoh ini, kita akan menggunakan Ethernet Shield dan Arduino anda untuk send dan receive text string via UDP Protocol.

Kita akan membutuhkan device lain untuk untuk menjadi lawan send dan receive-nya.

Kebutuhan Hardware

Arduino atau Genuino Board
Arduino Ethernet Shield

Circuit

Ethernet Shield mengijinkan kita untuk tersambung ke WizNet Ethernet controller ke board Arduino atau Genuino boards via SPI bus. Dia menggunakan pin 10, 11, 12, dan 13 untuk SPI connection ke WizNet.

Code

/*
 UDPSendReceiveString:
 This sketch receives UDP message strings, prints them to the serial port
 and sends an "acknowledge" string back to the sender

 A Processing sketch is included at the end of file that can be used to send
 and received messages for testing with a computer.

 created 21 Aug 2010
 by Michael Margolis

 This code is in the public domain.
 */

#include <SPI.h>         // needed for Arduino versions later than 0018
#include <Ethernet.h>
#include <EthernetUdp.h>         // UDP library from: bjoern@cs.stanford.edu 12/30/2008
 

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(192, 168, 0, 3);

unsigned int localPort = 8888;      // local port to listen on

// buffers for receiving and sending data
char packetBuffer[UDP_TX_PACKET_MAX_SIZE];  //buffer to hold  incoming packet,
char  ReplyBuffer[] = "acknowledged";       // a string to send back

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

void setup() {
  // start the Ethernet and UDP:
  Ethernet.begin(mac, ip);
  Udp.begin(localPort);

  Serial.begin(9600);
}

void loop() {
  // if there's data available, read a packet
  int packetSize = Udp.parsePacket();
  if (packetSize) {
    Serial.print("Received packet of size ");
    Serial.println(packetSize);
    Serial.print("From ");
    IPAddress remote = Udp.remoteIP();
    for (int i = 0; i < 4; i++) {
      Serial.print(remote[i], DEC);
      if (i < 3) {
        Serial.print(".");
      }
    }
    Serial.print(", port ");
    Serial.println(Udp.remotePort()); 

    // read the packet into packetBufffer
    Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
    Serial.println("Contents:");
    Serial.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();
  }
  delay(10);
}

Contoh APlikasi Pengirim Data & Penerima Data

Pengirim UDP

echo -n “foo” | nc -4u -w1 <host> <udp port>

echo -n “Hello World” | nc -4u -w1 192.168.0.3 udp 8888

Penerima UDP

nc -4u -l 6000

Referensi

https://www.arduino.cc/en/Tutorial/UDPSendReceiveString