UDP not working

[ripper121]

In the UI I used the UDP server. I checked the Box and no errors in the Command Prompt window.

This is the code I used on my ESP8266, mostly copyed from the moppy2 sources for ESP8266 But I dont get any messages when I Start playing in the UI. When I use a other UDP Software I can send messages to the ESP8266 without any problem.

#include <ESP8266WiFi.h>
#include <WiFiUdp.h>

#ifndef STASSID
#define STASSID "MyWifi"
#define STAPSK  "MyPSK"
#endif


WiFiUDP UDP;

void setup() {
  Serial.begin(57600);
  WiFi.mode(WIFI_STA);
  WiFi.begin(STASSID, STAPSK);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print('.');
    delay(500);
  }
  Serial.print("Connected! IP address: ");
  Serial.println(WiFi.localIP());
  Serial.printf("UDP server on port %d\n", localPort);
  Serial.println("");
  Serial.println("Connecting to UDP");


  if (UDP.beginMulticast(WiFi.localIP(), IPAddress(239, 2, 2, 7), 30994) == 1) {
    Serial.println("Connection successful");
  } else {
    Serial.println("Connection failed");
  }
}

uint8_t messagePos = 0;                         // Track current message read position
uint8_t messageBuffer[259]; // Max message length for Moppy messages is 259

void loop() {
  // Handle UDP packets
  int packetSize = UDP.parsePacket();
  if (packetSize) {
    Serial.println("");
    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 messageBuffer
    int messageLength = UDP.read(messageBuffer, 259);


    UDP.flush(); // Just incase we got a really long packet
  }

}

[Sammy1Am]

If other software can send UDP to the microcontroller without issue, it sounds like it might be a problem on the Java/Controller side of things. Do you have any UDP tools you can use to test receiving the UDP messages from the Controller? A packet sniffer would work for this too.

Could be a Windows Firewall thing?