WiFi NINA / NINA-FW Concurrency Bug Example

receiver.ino

#include <SPI.h>
#include <WiFiNINA.h>
#include <WiFiUdp.h>

#define IN_PORT 8000
#define OUT_PORT 9000

// wifi
char ssid[] = "";
char pass[] = "";

int keyIndex = 0;
int status = WL_IDLE_STATUS;

// udp
char packetBuffer[UDP_TX_PACKET_MAX_SIZE];

char route1[] = "/hello/dog"; // 10 chars
char route2[] = "/goodbye/horse"; // 14 chars

bool received = false;

WiFiUDP Udp;

void setup() {
  Serial.begin(9600);

  // connect wifi
  while (status != WL_CONNECTED) {
    Serial.print("Connecting to SSID: ");
    Serial.println(ssid);
    status = WiFi.begin(ssid, keyIndex, pass);
  }

  // setup UDP
  Udp.begin(IN_PORT);

  Serial.println("everything setup to test!");
}

void loop() {
  int packetSize = Udp.parsePacket();
  if (packetSize)
  {
    Udp.read(packetBuffer, packetSize);
    received = false;

    if (startsWith(route1, packetBuffer, 10)) {
      Serial.print("1");
      received = true;
    }

    if (startsWith(route2, packetBuffer, 14)) {
      Serial.print("2");
      received = true;
    }

    Serial.print(" received [");
    Serial.print(packetSize);
    Serial.println("]");

    // something went wrong
    // show buffer
    if (!received) {
      Serial.print("BUFFER: ");
      for (int i = 0; i < UDP_TX_PACKET_MAX_SIZE; i++) {
        Serial.print(packetBuffer[i], HEX);
        Serial.print(" ");
      }
      Serial.println();

      Serial.print("BUFFER: ");
      for (int i = 0; i < UDP_TX_PACKET_MAX_SIZE; i++) {
        Serial.print(packetBuffer[i]);
        Serial.print(" ");
      }
      Serial.println();
    }
  }
}

bool startsWith(char reference[], char msg[], int size) {
  for (auto i = 0; i < size; i++) {
    if (reference[i] != msg[i])
      return false;
  }
  return true;
}

sender.pde

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
import java.net.InetAddress;

DatagramSocket outSocket;
InetAddress ip;

void setup() {
  size(500, 500);
  frameRate(30);

  try {
    outSocket = new DatagramSocket();
    ip = InetAddress.getByName("192.168.1.34");
  } 
  catch(Exception ex) {
    println(ex);
  }
}

void draw() {
  background(55);

  send("/hello/dog");
  send("/goodbye/horse");
}

void send(String msg) {
  try {
    byte[] data = msg.getBytes(); 
    DatagramPacket myPacket = new DatagramPacket(data, data.length, ip, 8000);
    outSocket.send(myPacket);
  } 
  catch(Exception ex) {
    println("Socket: " + ex.getMessage());
  }
}