ESP8266 sACN / E1.31 DMX to WS2812

#define FASTLED_ALLOW_INTERRUPTS 0
#include <FastLED.h>
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>

//wifi connection
#define MY_SSID "Network"
#define MY_PASS "password"
#define LISTEN_PORT 5568
IPAddress addr = IPAddress(239,255,0,1); //multicast address for sACN/ANSI E1.31 universe 1
WiFiUDP Udp;

//local LEDs
#define NUM_LEDS 8
#define LED_PIN D3
CRGB leds[NUM_LEDS];

//process incoming UDP message
void RecieveUdp()
{
  byte packet[126 + (NUM_LEDS * 3)];

  //test if a packet has been recieved
  if (Udp.parsePacket() > 0)
  {   
    //read-in packet and get length
    int len = Udp.read(packet, 126 + (NUM_LEDS * 3));

    //discard unread bytes
    Udp.flush();

    //test for empty packet
    if(len < 1)
      return;

    //test for sACN DMX packet
    if(packet[4] == 0x41 && packet[43] == 0x02)
    {
      int dmx = 126;
      
      //copy dmx data to leds
      for(int n = 0; n < NUM_LEDS; n++)
        leds[n] = CRGB(packet[dmx++], packet[dmx++], packet[dmx++]);

      //push led data
      FastLED.show(); 
    }
  }
}

void setup()
{
  //cennect to WiFi network
  WiFi.begin(MY_SSID, MY_PASS);
  Udp.beginMulticast(WiFi.localIP(), addr, LISTEN_PORT);

  //start LED port
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);

  //start serial port
  //Serial.begin(9600);
}

void loop()
{
  //get sACN
  RecieveUdp();

  //wait a spell
  delay(1);
}