Arduino Yun receives UDP packets, but fails to send

Projects Programming
1

I have an Arduino Yun connected via ethernet to my PC.
Although I receive successfully UDP packets from my PC, I can't send UDP packets from Arduino to my PC.

This is my code:

#include <Process.h>
#include <BridgeUdp.h>

BridgeUDP Udp;

IPAddress IP(172, 31, 92, 10); //MY PC'S IP

void setup() {
  Bridge.begin();       
  Udp.begin(9911); 
  Serial.begin(9600);
}

void loop() {

  //TAKES UDP - PRINTS TO SERIAL
  if (Udp.parsePacket()) {
    int udp_received = Udp.available();
    char udp_buffer[udp_received + 1];
    Udp.read(udp_buffer, udp_received);
    udp_buffer[udp_received] = '\0';
    Serial.println(udp_buffer);
  }

    //SENDING UDP TO PC (TESTING)
    char udp[] = "test";
    Udp.beginPacket(IP, 9911);
    Udp.write(udp, sizeof(udp));
    Udp.endPacket();
    delay(1000);
}

I send UDP packets from PC to Arduino using ncat -u 172.31.92.3 9911.
Then I use ncat -lu 172.31.92.10 -p 9911 to set up a UDP listening server on my PC, but I receive nothing from Arduino.

UPDATE:

Monitoring the connection with Wireshark shows that UDP packets from Arduino Yun to PC are actually sent, but I still can't see them in the console of the listening server.

2

Doesn't sizeof(udp) refer to the size of the char pointer, not the size of the string? Perhaps you were thinking of strlen()?

3

aarg:
Doesn't sizeof(udp) refer to the size of the char pointer, not the size of the string? Perhaps you were thinking of strlen()?

I tried strlen() too, but it doesn't work.
I tried to copy-paste the reference of the write function but it appears very strange in the preview, so I'll post the link: Bridge/src/BridgeUdp.cpp at master · arduino-libraries/Bridge · GitHub

4

"it doesn't work"... doesn't tell me much. What happens, or doesn't happen?

Does this thread suggest anything?
https://forum.arduino.cc/index.php?topic=497555.0

5

aarg:
"it doesn't work"... doesn't tell me much. What happens, or doesn't happen?

Does this thread suggest anything?
BridgeUDP library for Yun - Arduino Yún - Arduino Forum

"It doesn't work" -> udp listening server receives nothing from arduino.
I have done everything the link says long time ago.