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113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
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/*
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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.
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When a packet is received an Acknowledge packet is sent to the client on port remotePort
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Circuit:
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* WiFi shield attached
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created 30 December 2012
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by dlf (Metodo2 srl)
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*/
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#include <SPI.h>
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#include <WiFi.h>
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#include <WiFiUdp.h>
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int status = WL_IDLE_STATUS;
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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)
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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 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 Leonardo only
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}
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// check for the presence of the shield:
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if (WiFi.status() == WL_NO_SHIELD) {
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Serial.println("WiFi shield not present");
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// don't continue:
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while(true);
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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);
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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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{
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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) packetBuffer[len]=0;
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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 shield's 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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}
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