Particle UDP time out?

udpTimeOut.ino

/*
When no packets are received Udp.parsePacket() takes 997us (about 1ms)
When a packet is received it takes 17us. 

I think there is a timeout. It would be nice if we can set that with a function like: setTimeOut (like on Arduino with the Serial port). 

I'd like to set it on microsecond level. 

You can try this script by sending for example OSC data (I used TouchOSC). 
When you receive data it displays a '/' (first character in an OSC string).
*/ 

#include "application.h"

// UDP Port used for two way communication
unsigned int localPort = 8000;

// An UDP instance to let us send and receive packets over UDP
UDP Udp;

unsigned long t1; // for measuring purposes
unsigned long t2; // for measuring purposes
unsigned long t3 = 0; // for measuring purposes

void setTime() {
   t1 = micros();
}

void printTime() {
    t2 = micros()-t1;
    if(t2>t3) t3 = t2;

    Serial.print(F("time: "));
    Serial.print(t3);
    Serial.print(" ");
    Serial.println(t2);
}

void setup() {
  // start the UDP
  Udp.begin(localPort);
  
  // Print your device IP Address via serial
  Serial.begin(57600);
  Serial.println(WiFi.localIP());
}

void loop() {
  
  char a = '-';

  setTime();

  if (Udp.parsePacket() > 0) {
    
    // Read first char of data received
    a = Udp.read();

    // Ignore other chars
    Udp.flush();

    // Store sender ip and port
    //IPAddress ipAddress = Udp.remoteIP();
    //int port = Udp.remotePort();

    // Echo back data to sender
    //Udp.beginPacket(ipAddress, port);
    //Udp.write(c);
    //Udp.endPacket();
  }
  printTime();
 
  // print the read character 
  Serial.println(a);

  delay(100);
}