ESP having controlled LED

ESP1.ino

#include <ESP8266WiFi.h>        // Include the Wi-Fi library
#include <WiFiUdp.h>

const char *ssid = "ESP8266"; // The name of the Wi-Fi network that will be created
const char *password = "00000000";   // The password required to connect to it, leave blank for an open network

WiFiUDP Udp;
unsigned int localUdpPort = 4210;  // local port to listen on
char incomingPacket[255];  // buffer for incoming packets
char  replyPacket[] = "Hi there! Got the message :-)";  // a reply string to send back


void setup() {
  Serial.begin(115200);
  delay(10);
  Serial.println('\n');
  pinMode(2, OUTPUT);
  
  WiFi.softAP(ssid, password);             // Start the access point
  Serial.print("Access Point \"");
  Serial.print(ssid);
  Serial.println("\" started");

  Serial.print("IP address:\t");
  Serial.println(WiFi.softAPIP());         // Send the IP address of the ESP8266 to the computer

  Udp.begin(localUdpPort);
  Serial.printf("Now listening at IP %s, UDP port %d\n", WiFi.localIP().toString().c_str(), localUdpPort);
  Udp.beginPacket("192.168.4.3", 4210);
  Udp.write("Initial msg");
  Udp.endPacket();
}

void loop() {
  int packetSize = Udp.parsePacket();
  if (packetSize)
  {
    // receive incoming UDP packets
    Serial.printf("Received %d bytes from %s, port %d\n", packetSize, Udp.remoteIP().toString().c_str(), Udp.remotePort());
    int len = Udp.read(incomingPacket, 255);
    if (len > 0)
    {
      incomingPacket[len] = 0;
    }
    Serial.printf("UDP packet contents: %s\n", incomingPacket);
    if(incomingPacket[len-1] == '0')
      digitalWrite(2,1);
    else if(incomingPacket[len-1] == '1')
      digitalWrite(2,0);
  }
 
 }