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120 lines
3.0 KiB
C++
120 lines
3.0 KiB
C++
/*
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UDPSendReceive.pde:
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This sketch receives UDP message strings, prints them to the serial port
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and sends an "acknowledge" string back to the sender
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A Processing sketch is included at the end of file that can be used to send
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and received messages for testing with a computer.
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created 21 Aug 2010
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by Michael Margolis
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This code is in the public domain.
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*/
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#include <SPI.h> // needed for Arduino versions later than 0018
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#include <Ethernet.h>
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#include <EthernetUdp.h> // UDP library from: bjoern@cs.stanford.edu 12/30/2008
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// Enter a MAC address and IP address for your controller below.
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// The IP address will be dependent on your local network:
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byte mac[] = {
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0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
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};
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IPAddress ip(192, 168, 1, 177);
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unsigned int localPort = 8888; // local port to listen on
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// buffers for receiving and sending data
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char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; //buffer to hold incoming packet,
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char ReplyBuffer[] = "acknowledged"; // a string to send back
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// An EthernetUDP instance to let us send and receive packets over UDP
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EthernetUDP Udp;
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void setup() {
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// start the Ethernet and UDP:
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Ethernet.begin(mac, ip);
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Udp.begin(localPort);
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Serial.begin(9600);
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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 remote = Udp.remoteIP();
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for (int i = 0; i < 4; i++)
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{
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Serial.print(remote[i], DEC);
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if (i < 3)
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{
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Serial.print(".");
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}
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}
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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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Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
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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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delay(10);
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}
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/*
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Processing sketch to run with this example
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=====================================================
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// Processing UDP example to send and receive string data from Arduino
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// press any key to send the "Hello Arduino" message
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import hypermedia.net.*;
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UDP udp; // define the UDP object
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void setup() {
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udp = new UDP( this, 6000 ); // create a new datagram connection on port 6000
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//udp.log( true ); // <-- printout the connection activity
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udp.listen( true ); // and wait for incoming message
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}
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void draw()
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{
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}
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void keyPressed() {
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String ip = "192.168.1.177"; // the remote IP address
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int port = 8888; // the destination port
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udp.send("Hello World", ip, port ); // the message to send
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}
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void receive( byte[] data ) { // <-- default handler
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//void receive( byte[] data, String ip, int port ) { // <-- extended handler
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for(int i=0; i < data.length; i++)
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print(char(data[i]));
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println();
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}
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*/
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