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libraries/WiFi: Add UDP Examples.
Signed-off-by: IFX-Anusha <[email protected]>
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‎libraries/WiFi/examples/WiFiUdpNtpClient/WiFiUdpNtpClient.ino‎

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/*
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UDP NTP Client
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Get the time from a Network Time Protocol (NTP) time server
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Demonstrates use of UDP sendPacket and ReceivePacket
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For more on NTP time servers and the messages needed to communicate with them,
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see http://en.wikipedia.org/wiki/Network_Time_Protocol
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created 4 Sep 2010
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by Michael Margolis
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modified 9 Apr 2012
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by Tom Igoe
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This code is in the public domain.
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modified 2025
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by Infineon Technologies AG
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*/
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#include <WiFi.h>
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#include <WiFiUdp.h>
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#include "secrets.h"
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int status = WL_IDLE_STATUS;
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char ssid[] = NET_SECRET_SSID; // your network SSID (name)
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char pass[] = NET_SECRET_PASSWORD; // your network password
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int keyIndex = 0; // your network key Index number (needed only for WEP)
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unsigned int localPort = 2390; // local port to listen for UDP packets
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IPAddress timeServer(129, 6, 15, 28); // time.nist.gov NTP server
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const int NTP_PACKET_SIZE = 48; // NTP time stamp is in the first 48 bytes of the message
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byte packetBuffer[ NTP_PACKET_SIZE]; //buffer to hold incoming and outgoing packets
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// A UDP instance to let us send and receive packets over UDP
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WiFiUDP Udp;
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void setup() {
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// Open serial communications and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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}
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// attempt to connect to WiFi network:
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while (status != WL_CONNECTED) {
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Serial.print("Attempting to connect to SSID: ");
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Serial.println(ssid);
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// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
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status = WiFi.begin(ssid, pass);
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// wait 10 seconds for connection:
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delay(10000);
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}
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Serial.println("Connected to WiFi");
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printWifiStatus();
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Serial.println("\nStarting connection to server...");
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Udp.begin(localPort);
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}
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void loop() {
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sendNTPpacket(timeServer); // send an NTP packet to a time server
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// wait to see if a reply is available
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delay(1000);
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if (Udp.parsePacket()) {
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Serial.println("packet received");
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// We've received a packet, read the data from it
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Udp.read(packetBuffer, NTP_PACKET_SIZE); // read the packet into the buffer
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//the timestamp starts at byte 40 of the received packet and is four bytes,
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// or two words, long. First, extract the two words:
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unsigned long highWord = word(packetBuffer[40], packetBuffer[41]);
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unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]);
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// combine the four bytes (two words) into a long integer
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// this is NTP time (seconds since Jan 1 1900):
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unsigned long secsSince1900 = highWord << 16 | lowWord;
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Serial.print("Seconds since Jan 1 1900 = ");
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Serial.println(secsSince1900);
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// now convert NTP time into everyday time:
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Serial.print("Unix time = ");
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// Unix time starts on Jan 1 1970. In seconds, that's 2208988800:
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const unsigned long seventyYears = 2208988800UL;
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// subtract seventy years:
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unsigned long epoch = secsSince1900 - seventyYears;
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// print Unix time:
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Serial.println(epoch);
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// print the hour, minute and second:
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Serial.print("The UTC time is "); // UTC is the time at Greenwich Meridian (GMT)
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Serial.print((epoch % 86400L) / 3600); // print the hour (86400 equals secs per day)
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Serial.print(':');
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if (((epoch % 3600) / 60) < 10) {
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// In the first 10 minutes of each hour, we'll want a leading '0'
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Serial.print('0');
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}
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Serial.print((epoch % 3600) / 60); // print the minute (3600 equals secs per minute)
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Serial.print(':');
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if ((epoch % 60) < 10) {
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// In the first 10 seconds of each minute, we'll want a leading '0'
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Serial.print('0');
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}
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Serial.println(epoch % 60); // print the second
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}
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// wait ten seconds before asking for the time again
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delay(10000);
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}
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// send an NTP request to the time server at the given address
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void sendNTPpacket(IPAddress& address) {
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// set all bytes in the buffer to 0
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memset(packetBuffer, 0, NTP_PACKET_SIZE);
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// Initialize values needed to form NTP request
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// (see URL above for details on the packets)
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packetBuffer[0] = 0b11100011; // LI, Version, Mode
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packetBuffer[1] = 0; // Stratum, or type of clock
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packetBuffer[2] = 6; // Polling Interval
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packetBuffer[3] = 0xEC; // Peer Clock Precision
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// 8 bytes of zero for Root Delay & Root Dispersion
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packetBuffer[12] = 49;
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packetBuffer[13] = 0x4E;
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packetBuffer[14] = 49;
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packetBuffer[15] = 52;
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// all NTP fields have been given values, now
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// you can send a packet requesting a timestamp:
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Udp.beginPacket(address, 123); //NTP requests are to port 123
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Udp.write(packetBuffer, NTP_PACKET_SIZE);
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Udp.endPacket();
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}
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void printWifiStatus() {
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// print the SSID of the network you're attached to:
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Serial.print("SSID: ");
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Serial.println(WiFi.SSID());
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// print your WiFi local IP address:
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IPAddress ip = WiFi.localIP();
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Serial.print("IP Address: ");
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Serial.println(ip);
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// print the received signal strength:
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long rssi = WiFi.RSSI();
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Serial.print("signal strength (RSSI):");
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Serial.print(rssi);
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Serial.println(" dBm");
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}

‎libraries/WiFi/examples/WiFiUdpNtpClient/secrets.h‎

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#define NET_SECRET_SSID "Anu"
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#define NET_SECRET_PASSWORD "anu@12345"

‎libraries/WiFi/examples/WiFiUdpReceiver/WiFiUdpReceiver.ino‎

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/*
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WiFiUdpReceiver Example
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This sketch wait an UDP packet on localPort
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When a packet is received an Acknowledge packet is sent to the client on port remotePort
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created 30 December 2012
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by dlf (Metodo2 srl)
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modified 2025
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by Infineon Technologies AG
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*/
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#include <WiFi.h>
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#include <WiFiUdp.h>
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#include "secrets.h" // Include your secrets file with SSID and password
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int status = WL_IDLE_STATUS;
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char ssid[] = NET_SECRET_SSID; // your network SSID (name)
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char pass[] = NET_SECRET_PASSWORD; // your network password (use for WPA, or use as key for WEP)
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unsigned int localPort = 1234; // local port to listen on
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char packetBuffer[255]; //buffer to hold incoming packet
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char ReplyBuffer[] = "acknowledged"; // a string to send back
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WiFiUDP Udp;
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void setup() {
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//Initialize serial and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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}
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// attempt to connect to WiFi network:
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while (status != WL_CONNECTED) {
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Serial.print("Attempting to connect to SSID: ");
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Serial.println(ssid);
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// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
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status = WiFi.begin(ssid, pass);
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// wait 10 seconds for connection:
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delay(10000);
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}
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Serial.println("Connected to WiFi");
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printWifiStatus();
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Serial.println("\nStarting connection to server...");
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// if you get a connection, report back via serial:
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Udp.begin(localPort);
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}
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void loop() {
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// if there's data available, read a packet
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int packetSize = Udp.parsePacket();
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if (packetSize) {
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Serial.print("Received packet of size ");
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Serial.println(packetSize);
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Serial.print("From ");
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IPAddress remoteIp = Udp.remoteIP();
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Serial.print(remoteIp);
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Serial.print(", port ");
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Serial.println(Udp.remotePort());
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// read the packet into packetBufffer
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int len = Udp.read(packetBuffer, 255);
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if (len > 0) {
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packetBuffer[len] = 0;
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}
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Serial.println("Contents:");
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Serial.println(packetBuffer);
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// send a reply, to the IP address and port that sent us the packet we received
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Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
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Udp.write(ReplyBuffer);
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Udp.endPacket();
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}
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}
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void printWifiStatus() {
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// print the SSID of the network you're attached to:
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Serial.print("SSID: ");
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Serial.println(WiFi.SSID());
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// print your WiFi local IP address:
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IPAddress ip = WiFi.localIP();
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Serial.print("IP Address: ");
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Serial.println(ip);
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// print the received signal strength:
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long rssi = WiFi.RSSI();
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Serial.print("signal strength (RSSI):");
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Serial.print(rssi);
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Serial.println(" dBm");
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}

‎libraries/WiFi/examples/WiFiUdpReceiver/secrets.h‎

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#define NET_SECRET_SSID "Anu"
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#define NET_SECRET_PASSWORD "anu@12345"

‎libraries/WiFi/examples/WiFiUdpSender/WiFiUdpSender.ino‎

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/*
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WiFiUdpSender Example
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This sketch sends a UDP packet to a server on remote port and waits for a reply.
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This example works together with the WiFiUdpReceiver example.
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created 2025
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by Infineon Technologies AG
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*/
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#include <WiFi.h>
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#include <WiFiUdp.h>
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#include "secrets.h" // Include your secrets file with SSID and password
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int status = WL_IDLE_STATUS;
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char ssid[] = NET_SECRET_SSID;
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char pass[] = NET_SECRET_PASSWORD;
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unsigned int localPort = 4321; // Local port to listen for replies
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const char* serverIP = " 192.168.38.107"; // Change to your server's IP. You can get it by doing WiFi.localIP() on server side
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unsigned int serverPort = 1234; // Server's listening port
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char packetBuffer[255]; //buffer to hold incoming packet
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WiFiUDP Udp;
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void setup() {
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Serial.begin(9600);
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while (!Serial);
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// attempt to connect to WiFi network:
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while (status != WL_CONNECTED) {
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Serial.print("Attempting to connect to SSID: ");
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Serial.println(ssid);
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// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
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status = WiFi.begin(ssid, pass);
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// wait 10 seconds for connection:
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delay(10000);
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}
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Serial.println("Connected to WiFi");
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printWifiStatus();
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Udp.begin(localPort);
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Serial.println("UDP client started");
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}
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void loop() {
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// Send a packet to the server
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const char* msg = "Hello from client!";
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Udp.beginPacket(serverIP, serverPort);
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Udp.write(msg);
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Udp.endPacket();
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Serial.println("Packet sent to server");
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// Wait for a reply (with timeout)
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unsigned long start = millis();
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bool gotReply = false;
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while (millis() - start < 2000) { // 2 second timeout
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int packetSize = Udp.parsePacket();
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if (packetSize) {
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int len = Udp.read(packetBuffer, 254);
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if (len > 0) packetBuffer[len] = 0;
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Serial.print("Received reply: ");
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Serial.println(packetBuffer);
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gotReply = true;
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break;
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}
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delay(10);
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}
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if (!gotReply) {
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Serial.println("No reply received.");
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}
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delay(5000); // Wait before sending again
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}
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void printWifiStatus() {
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// print the SSID of the network you're attached to:
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Serial.print("SSID: ");
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Serial.println(WiFi.SSID());
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// print your WiFi local IP address:
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IPAddress ip = WiFi.localIP();
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Serial.print("IP Address: ");
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Serial.println(ip);
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// print the received signal strength:
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long rssi = WiFi.RSSI();
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Serial.print("signal strength (RSSI):");
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Serial.print(rssi);
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Serial.println(" dBm");
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}

‎libraries/WiFi/examples/WiFiUdpSender/secrets.h‎

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#define NET_SECRET_SSID "Anu"
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#define NET_SECRET_PASSWORD "anu@12345"

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