#include <vector>
#include <string>
using namespace std;

#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h> 
#include <netdb.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>

static int 		echo_interval = 1;		/*!< Default echo interval is 1 sec						*/
static int  	echo_port	  = 5000;	/*!< Default port for echo service						*/
static string 	echo_server;			/*!< Server name (Panel PC)								*/
static bool 	verbose = false;		/*!< If true then the program operates in verbose mode  */


int main(int argc, char **argv) 
{
	verbose = true;
	echo_server = "PanelPC";

	printf ("Starting .......");	
	
	/* Establish a connection with the echo server */
	
	struct hostent *he = gethostbyname(echo_server.c_str());
	
	string ip = inet_ntoa(*(struct in_addr*)he->h_addr_list[0]);
	
	struct sockaddr_in addr;
	
	memset (&addr, 0, sizeof (addr));
	
	addr.sin_family = AF_INET;
	addr.sin_port = htons (echo_port);
	
	memcpy (&addr.sin_addr, he->h_addr_list[0], 4);
	
	int 	rd;
	int 	sid;
	time_t 	time_of_day;
	char 	tx[128];
	char 	rx[128];
	
	while (1)
	{	
		sid = socket(AF_INET, SOCK_STREAM, 0); 
	
		if (verbose)
			printf ("Watchdog: Connecting to host '%s' with ip address %s:%d\n", echo_server.c_str(), ip.c_str(), echo_port);
		
		if ( connect (sid, (sockaddr *)&addr, sizeof(addr)) == -1 )
		{
			/* No connection with the server - try again */
			
			fprintf (stderr, "%s, %s: Connection to host=%s:%d failed: %s\n", __FILE__, __FUNCTION__, ip.c_str(), echo_port, strerror (errno));	
			
			close(sid);
		}
		else
		{
			/* Start sending and receiving echo messages */ 
			
			time_of_day = time(NULL);
			strftime(tx, 128, "Echo message send by client at %T", localtime(&time_of_day));			
			send(sid, tx, strlen(tx), 0);
			
			while ( (rd = recv(sid, rx, 128, 0)) != -1 )
			{
				if (verbose && (rd > 0) )
					printf ("Watchdog: %s returned: %s\n", echo_server.c_str(), rx);
				
				sleep (echo_interval);			 	
		
				time_of_day = time(NULL);
				strftime(tx, 128, "Echo message send by client at %T", localtime(&time_of_day));			
				
				if ( send(sid, tx, strlen(tx), 0) == -1 )
					break;
			}
	
			fprintf (stderr, "%s, %s: Connection to host=%s:%d lossed: %s\n", __FILE__, __FUNCTION__, ip.c_str(), echo_port, strerror (errno));	
			
			close(sid);	
		}
	}	

	return 0;
}