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

#define DEST_PORT 5842		// The port used is hardcoded, the IP is fed as an argument for the sake of testing.

main(int argc, char *argv[]) {
	if (argc < 2) {
		printf("Usage: %s <IP>\n\tDefault IP is 69.55.233.82. Assuming port 5842\n", argv[0]);
		return(1);
	}

	// Need a socket first
	int sockfd;	// Socket descriptor
	sockfd = socket(PF_INET, SOCK_STREAM, 0);

	// Creates a struct of type sockaddr_in
	struct sockaddr_in dest_addr;
		dest_addr.sin_family = AF_INET;
		dest_addr.sin_port = htons(DEST_PORT);
		dest_addr.sin_addr.s_addr = inet_addr(argv[1]);
		memset(&(dest_addr.sin_zero), '\0', 8);
	
	// int connect(int sockfd, struct sockaddr *serv_addr, int addrlen); 
	if (connect(sockfd, (struct sockaddr *)&dest_addr, sizeof(struct sockaddr)) == -1) {
		printf("Error connecting\n");
		return(1);
	} else {
		printf("Connected OK to %d @ %s\n", DEST_PORT, argv[1]);
	}
	
	// container for the package
	unsigned int message[4] = {0, 0, 0, 0};
	unsigned int sum = 0;
	unsigned int tx = 0;
	unsigned int i = 0;
	
	// lets receive the unsigned ints (4 of them)
	printf("RX:\n");
	for (i = 0; i < 4; i++) {
		tx += recv(sockfd, &message[i], sizeof(unsigned int), 0);
		printf(" %d  0x%x  (%d)\n", i, message[i], message[i]);
		sum += message[i];
	}
	printf("[%i bytes]\n\n", tx, sum);
	
	// answer the server
			printf("TX:\n 0  0x%x  (%u)\n\n", sum, sum);
	char buf[255] = "";
	send(sockfd, &sum, sizeof(sum), 0);
	
	// receive final reply
	recv(sockfd, buf, sizeof(buf), 0);
	printf("RX: \n %s", buf);

	// finished
	close(sockfd);

	return(0);
}