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

#define porta_locale 7777

int main(){
	int sockfd;
	struct sockaddr_in my_addr, cli_addr;
	size_t l;
	char testo[512];
	char resp[] = "ACK";
	if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0){
		printf("ERRORE APERTURA SOCKET\n");
		exit(1);
	}
	memset((char *) &my_addr, 0, sizeof(my_addr));
	my_addr.sin_family = AF_INET;
	my_addr.sin_port = htons(porta_locale);
	my_addr.sin_addr.s_addr = htonl(INADDR_ANY);

	if(bind(sockfd, (struct sockaddr *) &my_addr, sizeof(my_addr)) <0){
		printf("ERRORE BINDING\n");
		exit(1);
	}

	for(;;){
		l=sizeof(my_addr);
		recvfrom(sockfd, testo, 511, 0, (struct sockaddr*) &cli_addr, (socklen_t *) &l);
		printf("%s\n", testo);
		sendto(sockfd, resp, strlen(resp)+1, 0, (struct sockaddr*) &cli_addr, sizeof(cli_addr));
	}
}