Arduino-Development / libraries /WiFi /examples /WiFiUdpSendReceiveString /WiFiUdpSendReceiveString.ino
| /* | |
| WiFi UDP Send and Receive String | |
| 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 | |
| Circuit: | |
| * WiFi shield attached | |
| created 30 December 2012 | |
| by dlf (Metodo2 srl) | |
| */ | |
| int status = WL_IDLE_STATUS; | |
| char ssid[] = "yourNetwork"; // your network SSID (name) | |
| 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); | |
| while (!Serial) { | |
| ; // wait for serial port to connect. Needed for native USB port only | |
| } | |
| // check for the presence of the shield: | |
| if (WiFi.status() == WL_NO_SHIELD) { | |
| Serial.println("WiFi shield not present"); | |
| // don't continue: | |
| while (true); | |
| } | |
| String fv = WiFi.firmwareVersion(); | |
| if (fv != "1.1.0") { | |
| Serial.println("Please upgrade the firmware"); | |
| } | |
| // attempt to connect to Wifi network: | |
| while (status != WL_CONNECTED) { | |
| Serial.print("Attempting to connect to SSID: "); | |
| Serial.println(ssid); | |
| // Connect to WPA/WPA2 network. Change this line if using open or WEP network: | |
| status = WiFi.begin(ssid); | |
| // wait 10 seconds for connection: | |
| delay(10000); | |
| } | |
| Serial.println("Connected to wifi"); | |
| printWifiStatus(); | |
| Serial.println("\nStarting connection to server..."); | |
| // if you get a connection, report back via serial: | |
| Udp.begin(localPort); | |
| } | |
| 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 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; | |
| } | |
| 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(); | |
| } | |
| } | |
| 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"); | |
| } | |