#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<arpa/inet.h>
#include<sys/socket.h>

#define BUFLEN 512
#define PORT 8888


int main(void)
{
        struct sockaddr_in si_me;
        memset(&si_me, 0, sizeof(struct sockaddr_in));
        si_me.sin_family = AF_INET;
        si_me.sin_port = htons(PORT);
        si_me.sin_addr.s_addr = htonl(INADDR_ANY);


        struct sockaddr_in si_other;
        int i = sizeof(si_other);
        int slen = recv_len;
        char buf[BUFLEN];

        //create a UDP socket
        int s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)

        //bind socket to port
        bind(s, (struct sockaddr*) &si_me, sizeof(si_me) )

        //keep listening for data
        while(1)
        {
                printf("Waiting for data...");
                fflush(stdout);
                recv_len = recvfrom(s, buf, BUFLEN, 0, (struct sockaddr *) &si_other, &slen)

                printf("Received packet from %s:%d\n", inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port));
                printf("Data: %s\n" , buf);

                //now reply the client with the same data
                sendto(s, buf, recv_len, 0, (struct sockaddr*) &si_other, slen)
        }

        close(s);
        return 0;
}