Here is a very basic UDP send to one node at a time. Make a simple win32 project and copy this in. (Also added to github)

// simple_udp.cpp : Defines the entry point for the console application.
//

// Headers (put this in stdafx.h if using precompiled headers)
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include <winsock2.h>
#include <Ws2tcpip.h>

#include <conio.h>

// Library needed
#pragma comment(lib, "Ws2_32.lib")

// Defines
#define LIGHTS        L"192.168.1.230"    // Address of Node
#define BUFLEN        ( 450  )            // Length of data to send to LED strips, 150 LEDs, three byte values per LED , 450
#define PORT        (40002)                // The port the ESP is listening on


// short cut exit routine
void die(const char *str)
{
    fprintf(stderr, "error: %s\n",str);

    WSACleanup();

    // exit with error
    exit(1);
}

int main(void)
{
    WSADATA  w ;

    struct sockaddr_in si_other;
    int s, slen = sizeof(si_other);
    unsigned char data[BUFLEN];

    /* Open windows connection */
    if (WSAStartup(MAKEWORD(2, 2), &w) != 0) {
        fprintf(stderr, "could not initialise winsock\n");
        exit(0);
    }

    // create a udp socket
    if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) {
        die("socket create error");
    }

    // setup the target port/address
    memset((char *)&si_other, 0, sizeof(si_other));
    si_other.sin_family = AF_INET;
    si_other.sin_port = htons(PORT);


    // convert IP address string to numerical
    if (1 != InetPton(AF_INET, LIGHTS, &si_other.sin_addr)) {

        die("InetPton failed");

    }

    printf("press space to stop\n");

    // wait for a key press
    while (!_kbhit()) {

        // fill the buffer with a simple blue fade
                // each LED is three bytes, RGB, so the 2nd led is (index*3)
        for (int i = 0; i < BUFLEN; i+=3) {

            data[i  ] = 0;        // red
            data[i+1] = 0;        // green
            data[i+2] = i>>1;    // blue
        }

        // send to ESP
        if (sendto(s, (const char*)data, BUFLEN, MSG_DONTROUTE, (struct sockaddr *) &si_other, slen) == -1) {
            die("couldn't sendto");
        }
    }

    //get rid of keypress (fflush)
    _getch();

    closesocket(s);

    WSACleanup();

    return 0;
}