Arduino Function: EthernetUDP.remoteIP

Description

It gets the IP address of the remote connection. This function must be called after UDP.parsePacket().

Syntax

UDP.remoteIP();

Returns

 4 bytes : the IP address of the remote connection

Examples

#include <SPI.h>
#include <Ethernet.h> //If you are using Ethernet Shield 2, use instead <Ethernet2.h>
#include <EthernetUdp.h>

//Enter a MAC address and IP address for your controller below.
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

//The IP address will be dependent on your local network:
IPAddress ip(192, 168, 1, 177);

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

// 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);
}

void loop() {
int packetSize = Udp.parsePacket();
if(packetSize) {
Serial.print("Received packet of size ");
Serial.println(packetSize);
Serial.print("From IP : ");

IPAddress remote = Udp.remoteIP();
//print out the remote connection's IP address
Serial.print(remote);

Serial.print(" on port : ");
//print out the remote connection's port
Serial.println(Udp.remotePort());
}
}


Based on the reference originally written by Arduino Community,  wiring.org.co and  arduino.cc