#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <string.h>
#include <stdio.h>

int main()
{
	int sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);

	struct sockaddr_in sa;
	int bound;
	ssize_t recsize;
	socklen_t *address_len = NULL;

	sa.sin_addr.s_addr = INADDR_ANY;
	sa.sin_port = htons(7654);

	bound = bind(sock, (struct sockaddr *)&sa, sizeof(struct sockaddr));

	if (bound < 0)
		fprintf(stderr, "bind(): ошибка %s\n", strerror(errno));

	char Hz[1024];

	while (1) {
		printf("recv test....\n");
		recsize = recvfrom(sock, (void *)Hz, 100, 0, (struct sockaddr *)&sa, address_len);

		if (recsize < 0)
			perror("Ошибка:");

		printf("recsize: %d\n ", (int)recsize);
		//sleep(1);
		printf("datagram: %s\n", Hz);
	}
}