#include<sys/socket.h>
#include<sys/types.h>
#include<netinet/ip.h>
#include<arpa/inet.h>
#include<stdio.h>
#include<unistd.h>
#include<string.h>

int main(){
   struct sockaddr_in sad;
   sad.sin_port = htons(5162);
   sad.sin_addr.s_addr = INADDR_ANY;
   sad.sin_family = AF_INET;

   int skt = socket(AF_INET, SOCK_DGRAM, 0);
   bind(skt, (struct sockaddr *)(&sad), sizeof(struct sockaddr_in));
	// No listen.  We're using UDP
	char buffer[20];
	long int a, b;
	struct sockaddr_in cad;
	socklen_t cad_size = sizeof(struct sockaddr_in);
	for(;;){
		size_t readlen = recvfrom(skt, buffer, 20, 0, (struct sockaddr*)&cad, &cad_size);
		buffer[readlen] = 0;
		printf("Received message %s\n", buffer);
		strcpy(buffer, "donkey");
		sendto(skt, buffer, strlen(buffer), 0, (struct sockaddr*)&cad, cad_size);
	}
}