Hello,
I have a project where I have to send periodically data via UDP from Matlab to the Arduino DUE via WiFI.
The problem is that the Arduino receives the first request, but not the other requests. I have selected the 9090 port for communication, but the Arduino tells me that it receives the data on port 62181 (although the board is configured for the 9090 port). The program is based on the UDP WiFi example on the website.
I have used Wireshark to see what is going on: the host computer clearly sends the UDP request, the request is taken by the router and it returns ('Destination Not Reachable') message.
What should I do?
Here is the Arduino code:
/*
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)
*/
#include <SPI.h>
#include <WiFi.h>
#include <WiFiUdp.h>
int PIN = 37;
int status = WL_IDLE_STATUS;
char ssid[] = "TP_LINK"; // your network SSID (name)
char pass[] = "buckethead"; // 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 = 9090; // 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() {
pinMode(PIN, OUTPUT);
digitalWrite(PIN, LOW);
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo 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, pass);
// 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)
{
digitalWrite(PIN, HIGH);
delayMicroseconds(400);
digitalWrite(PIN, LOW);
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);
}
}
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");
}
Best regards,
Jean