140 lines
3.7 KiB
C++
140 lines
3.7 KiB
C++
/*
|
|
UDPSendReceiveString:
|
|
This sketch receives UDP message strings, prints them to the serial port
|
|
and sends an "acknowledge" string back to the sender
|
|
|
|
A Processing sketch is included at the end of file that can be used to send
|
|
and received messages for testing with a computer.
|
|
|
|
created 21 Aug 2010
|
|
by Michael Margolis
|
|
|
|
This code is in the public domain.
|
|
*/
|
|
|
|
|
|
#include <Ethernet.h>
|
|
#include <EthernetUdp.h>
|
|
|
|
// Enter a MAC address and IP address for your controller below.
|
|
// The IP address will be dependent on your local network:
|
|
byte mac[] = {
|
|
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
|
|
};
|
|
IPAddress ip(192, 168, 1, 177);
|
|
|
|
unsigned int localPort = 8888; // local port to listen on
|
|
|
|
// buffers for receiving and sending data
|
|
char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; // buffer to hold incoming packet,
|
|
char ReplyBuffer[] = "acknowledged"; // a string to send back
|
|
|
|
// An EthernetUDP instance to let us send and receive packets over UDP
|
|
EthernetUDP Udp;
|
|
|
|
void setup() {
|
|
// You can use Ethernet.init(pin) to configure the CS pin
|
|
//Ethernet.init(10); // Most Arduino shields
|
|
//Ethernet.init(5); // MKR ETH shield
|
|
//Ethernet.init(0); // Teensy 2.0
|
|
//Ethernet.init(20); // Teensy++ 2.0
|
|
//Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet
|
|
//Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet
|
|
|
|
// start the Ethernet
|
|
Ethernet.begin(mac, ip);
|
|
|
|
// Open serial communications 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 Ethernet hardware present
|
|
if (Ethernet.hardwareStatus() == EthernetNoHardware) {
|
|
Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");
|
|
while (true) {
|
|
delay(1); // do nothing, no point running without Ethernet hardware
|
|
}
|
|
}
|
|
if (Ethernet.linkStatus() == LinkOFF) {
|
|
Serial.println("Ethernet cable is not connected.");
|
|
}
|
|
|
|
// start UDP
|
|
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 remote = Udp.remoteIP();
|
|
for (int i=0; i < 4; i++) {
|
|
Serial.print(remote[i], DEC);
|
|
if (i < 3) {
|
|
Serial.print(".");
|
|
}
|
|
}
|
|
Serial.print(", port ");
|
|
Serial.println(Udp.remotePort());
|
|
|
|
// read the packet into packetBufffer
|
|
Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
|
|
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();
|
|
}
|
|
delay(10);
|
|
}
|
|
|
|
|
|
/*
|
|
Processing sketch to run with this example
|
|
=====================================================
|
|
|
|
// Processing UDP example to send and receive string data from Arduino
|
|
// press any key to send the "Hello Arduino" message
|
|
|
|
|
|
import hypermedia.net.*;
|
|
|
|
UDP udp; // define the UDP object
|
|
|
|
|
|
void setup() {
|
|
udp = new UDP( this, 6000 ); // create a new datagram connection on port 6000
|
|
//udp.log( true ); // <-- printout the connection activity
|
|
udp.listen( true ); // and wait for incoming message
|
|
}
|
|
|
|
void draw()
|
|
{
|
|
}
|
|
|
|
void keyPressed() {
|
|
String ip = "192.168.1.177"; // the remote IP address
|
|
int port = 8888; // the destination port
|
|
|
|
udp.send("Hello World", ip, port ); // the message to send
|
|
|
|
}
|
|
|
|
void receive( byte[] data ) { // <-- default handler
|
|
//void receive( byte[] data, String ip, int port ) { // <-- extended handler
|
|
|
|
for(int i=0; i < data.length; i++)
|
|
print(char(data[i]));
|
|
println();
|
|
}
|
|
*/
|
|
|
|
|