Ciao a tutti.
Il mio problema riguarda la comunicazione tramite protocollo udp tra Arduino e il mio computer(tramite programma in Java). Il punto è che riesco ad inviare dati da pc-->Arduino ma non il contrario Arduino-->pc. Ho guardato tanto in giro ma non sono riuscito a trovare niente che mi potesse soddisfare.
Lascio i codici se mi potete aiutare.
PROGRAMMA ARDUINO
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(192, 168, 2, 140);
unsigned int localPort = 8888; // local port to listen on
char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; // buffer to hold incoming packet,
char ReplyBuffer[] = "acknowledged"; // a string to send back
EthernetUDP Udp;
void setup() {
Ethernet.begin(mac, ip);
Serial.begin(9600);
Udp.begin(localPort);
}
void loop() {
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*, DEC);*
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if (i < 3) {*
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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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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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delay(2000);*
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char ReplyBuffer[] = "a";*
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Udp.beginPacket(Udp.remoteIP(), localPort);*
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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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PROGRAMMA JAVA
import java.io.*;
import java.net.*;
public class QuoteClient
{ -
public static void main(String[] args) {*
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String hostname = "192.168.2.140";*
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int port = 8888;*
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try {*
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InetAddress address = InetAddress.getByName(hostname);*
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DatagramSocket socket = new DatagramSocket(port);*
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while (true) {*
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byte[] buf = null;*
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String inp = "ciao";*
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buf = inp.getBytes();*
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System.out.println(buf);*
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String ad =""+address.getAddress();*
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DatagramPacket request = new DatagramPacket(buf, 4, address, port);*
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socket.send(request);*
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//DatagramSocket serverSocket = new DatagramSocket(port);*
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byte[] buffer = new byte[8];*
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System.out.println("1"+ad);*
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DatagramPacket response = new DatagramPacket(buffer, buffer.length);*
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System.out.println("2 ");*
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socket.receive(response);*
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System.out.println("3 ");*
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String sentence = new String( response.getData());*
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System.out.println("RECEIVED: " + sentence);*
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System.out.println("2 "+response);*
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socket.receive(response);*
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System.out.println("3");*
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String quote = new String(buffer, 0, response.getLength());*
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System.out.println(quote);*
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System.out.println(response);*
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System.out.println();*
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//Thread.sleep(10000);*
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}*
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} catch (SocketTimeoutException ex) {*
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System.out.println("Timeout error: " + ex.getMessage());*
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ex.printStackTrace();*
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} catch (IOException ex) {*
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System.out.println("Client error: " + ex.getMessage());*
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ex.printStackTrace();*
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}*
_ /*catch (InterruptedException ex) {_ -
ex.printStackTrace();*
_ }*/_ -
}*
}
Ringrazio quelli che riusciranno a darmi una mano
) e di leggere con MOLTA attenzione tutto il