#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#define _POSIX_C_SOURCE 1

int
main(int argc, char *argv[])
{
    int s;
    struct sockaddr_in addr;
    int addrlen;
    unsigned char buf[16] = "012345678901234";



    /*
     * INIT MULTICAST COMM
     */

    if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP)) == -1)
    {
        fprintf(stderr, "serv: Multicast socket() open fail. %s\n", strerror(errno));
        exit(EXIT_FAILURE);
    }

    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(25000);
    addr.sin_addr.s_addr = htonl(INADDR_ANY);
    addrlen = sizeof(addr);

    if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) == -1)
    {
        fprintf(stderr, "serv: Multicast bind() port fail. %s\n", strerror(errno));
        exit(EXIT_FAILURE);
    }

    /* set up addr for multicast on mcast_group */
    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(25000);
    addr.sin_addr.s_addr = inet_addr("224.0.0.250");
    addrlen = sizeof(addr);

    fprintf(stderr, "Start Loop\n");

    for (;;)
    {
        sleep(1);
        fprintf(stderr, "Loop: %s\n", buf);

        if ((sendto(s, (const void *)&buf[0], sizeof(buf), 0, (struct sockaddr *) &addr, addrlen)) == -1)
        {
            fprintf(stderr, "serv: sendto() fail. %s", strerror(errno));
            exit(EXIT_FAILURE);
        }
    }
}