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Arduino/libraries/WiFi/examples/WiFiUdpSendReceiveString/WiFiUdpSendReceiveString.ino

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/*
WiFi UDP Send and Receive String
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This sketch wait an UDP packet on localPort using a WiFi shield.
When a packet is received an Acknowledge packet is sent to the client on port remotePort
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Circuit:
* WiFi shield attached
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created 30 December 2012
by dlf (Metodo2 srl)
*/
#include <SPI.h>
#include <WiFi.h>
#include <WiFiUdp.h>
int status = WL_IDLE_STATUS;
char ssid[] = "yourNetwork"; // your network SSID (name)
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char pass[] = "secretPassword"; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // your network key Index number (needed only for WEP)
unsigned int localPort = 2390; // local port to listen on
char packetBuffer[255]; //buffer to hold incoming packet
char ReplyBuffer[] = "acknowledged"; // a string to send back
WiFiUDP Udp;
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
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while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
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// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
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// don't continue:
while (true);
}
String fv = WiFi.firmwareVersion();
if ( fv != "1.1.0" )
Serial.println("Please upgrade the firmware");
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// attempt to connect to Wifi network:
while ( status != WL_CONNECTED) {
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Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
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status = WiFi.begin(ssid);
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// wait 10 seconds for connection:
delay(10000);
}
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Serial.println("Connected to wifi");
printWifiStatus();
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Serial.println("\nStarting connection to server...");
// if you get a connection, report back via serial:
Udp.begin(localPort);
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}
void loop() {
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// if there's data available, read a packet
int packetSize = Udp.parsePacket();
if (packetSize)
{
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Serial.print("Received packet of size ");
Serial.println(packetSize);
Serial.print("From ");
IPAddress remoteIp = Udp.remoteIP();
Serial.print(remoteIp);
Serial.print(", port ");
Serial.println(Udp.remotePort());
// read the packet into packetBufffer
int len = Udp.read(packetBuffer, 255);
if (len > 0) packetBuffer[len] = 0;
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Serial.println("Contents:");
Serial.println(packetBuffer);
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// 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();
}
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}
void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}