#include <stdio.h>      /* for printf(), fprintf() */
#include <winsock2.h>    /* for socket(),... */
#include <stdlib.h>     /* for exit() */
#include <time.h>
#include <sys/types.h>

#define RCVBUFSIZE 32   /* Size of receive buffer */

void DieWithError(char *errorMessage){
    perror(errorMessage);
    exit(0);
};  /* Error handling function */

void main(int argc, char *argv[])
{
    int sock, rc;                        /* Socket descriptor */
    struct sockaddr_in echoServAddr; /* Echo server address */
    unsigned short echoServPort;     /* Echo server port */
    //char *servIP;                    /* Server IP address (dotted quad) */
    char servIP[] = "10.42.43.1";
	char echoString[]= "identifier=1z2y3z \r\n\r\n";
    char echoBuffer[RCVBUFSIZE];     /* Buffer for echo string */
    int echoStringLen;               /* Length of string to echo */
    int bytesRcvd, totalBytesRcvd;   /* Bytes read in single recv() and total bytes read */
    WSADATA wsaData;                 /* Structure for WinSock setup communication */
    unsigned long nonblocking = 1;
	fd_set writefds, readfds;
	struct timeval tv;
    tv.tv_sec = 5;
    tv.tv_usec = 500000;
    //servIP =  argv[1];             /* First arg: server IP address (dotted quad) */
    echoServPort = 8088; //atoi(8088);  //atoi(argv[2]);  /* Use given port, if any */
    if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) /* Load Winsock 2.0 DLL */
    {
        fprintf(stderr, "WSAStartup() failed");
        exit(1);
    }

    /* Create a reliable, stream socket using TCP */
    if ((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) ) < 0)
        DieWithError("socket() failed");
   

    /* Set the socket to nonblocking */
    if (ioctlsocket(sock, FIONBIO, &nonblocking) != 0)
        DieWithError("ioctlsocket() failed");

    /* Construct the server address structure */
    memset(&echoServAddr, 0, sizeof(echoServAddr));     /* Zero out structure */
    echoServAddr.sin_family      = AF_INET;             /* Internet address family */
    echoServAddr.sin_addr.s_addr = inet_addr(servIP);   /* Server IP address */
    echoServAddr.sin_port        = htons(echoServPort); /* Server port */
    
    FD_ZERO(&writefds);
    FD_SET(sock, &writefds);
	rc = select(sock, NULL, &writefds, NULL, &tv);
	if((rc == 1) && (FD_ISSET(sock, &writefds)))
{
	/* Establish the connection to the echo server */
    if (connect(sock, (struct sockaddr *) &echoServAddr, sizeof(echoServAddr)) < 0)
		DieWithError("connect() failed");
	}
	
    echoStringLen = strlen(echoString);          /* Determine input length */

	FD_ZERO(&readfds);
    FD_SET(sock, &readfds);
	rc = select(sock, &readfds, NULL, NULL, &tv);
	if((rc == 1) && (FD_ISSET(sock, &readfds)))
    {
    /* Send the string, including the null terminator, to the server */
    if (send(sock, echoString, echoStringLen, 0) != echoStringLen)
        DieWithError("send() sent a different number of bytes than expected");
	}
    /* Receive the same string back from the server */
    totalBytesRcvd = 0;
    printf("Received: ");                /* Setup to print the echoed string */
    while (totalBytesRcvd < echoStringLen)
    {
        /* Receive up to the buffer size (minus 1 to leave space for 
           a null terminator) bytes from the sender */
        if ((bytesRcvd = recv(sock, echoBuffer, RCVBUFSIZE - 1, 0)) <= 0)
            DieWithError("recv() failed or connection closed prematurely");
        totalBytesRcvd += bytesRcvd;   /* Keep tally of total bytes */
        echoBuffer[bytesRcvd] = '\0';  /* Add \0 so printf knows where to stop */
        printf("%s", echoBuffer);            /* Print the echo buffer */
    }
	


    printf("\n");    /* Print a final linefeed */

    closesocket(sock);
    WSACleanup();  /* Cleanup Winsock */

    exit(0);
}

#include <stdio.h>      /* for printf(), fprintf() */
#include <winsock2.h>    /* for socket(),... */
#include <stdlib.h>     /* for exit() */
#include <time.h>
#include <sys/types.h>

#define RCVBUFSIZE 3200   /* Size of receive buffer */

void DieWithError(char *errorMessage){
    perror(errorMessage);
    exit(0);
};  /* Error handling function */

void main(int argc, char *argv[])
{
    int sock, rc;                        /* Socket descriptor */
    struct sockaddr_in echoServAddr; /* Echo server address */
    unsigned short echoServPort;     /* Echo server port */
    //char *servIP;                    /* Server IP address (dotted quad) */
    char servIP[] = "10.42.43.1";
    char echoString[]= "identifier=1z2y3z \r\n\r\n";
    char echoBuffer[RCVBUFSIZE];     /* Buffer for echo string */
    int echoStringLen;               /* Length of string to echo */
    int bytesRcvd, totalBytesRcvd;   /* Bytes read in single recv() and total bytes read */
    WSADATA wsaData;                 /* Structure for WinSock setup communication */
    unsigned long nonblocking = 1;
    fd_set writefds, readfds;
    struct timeval tv;
    tv.tv_sec = 5;
    tv.tv_usec = 500000;
    //servIP =  argv[1];             /* First arg: server IP address (dotted quad) */
    echoServPort = 80; //atoi(8088);  //atoi(argv[2]);  /* Use given port, if any */

    if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) /* Load Winsock 2.0 DLL */
    {
        fprintf(stderr, "WSAStartup() failed");
        exit(1);
    }

    /* Create a reliable, stream socket using TCP */
    if ((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) ) < 0)
        DieWithError("socket() failed");
   

    /* Set the socket to nonblocking */
    if (ioctlsocket(sock, FIONBIO, &nonblocking) != 0)
        DieWithError("ioctlsocket() failed");

    /* Construct the server address structure */
    memset(&echoServAddr, 0, sizeof(echoServAddr));     /* Zero out structure */
    echoServAddr.sin_family      = AF_INET;             /* Internet address family */
    echoServAddr.sin_addr.s_addr = inet_addr(servIP);   /* Server IP address */
    echoServAddr.sin_port        = htons(echoServPort); /* Server port */

    connect(sock, (struct sockaddr *) &echoServAddr, sizeof(echoServAddr)); 

    FD_ZERO(&writefds);
    FD_SET(sock, &writefds);
    rc = select(sock, NULL, &writefds, NULL, &tv);

    if((rc == 1) && (FD_ISSET(sock, &writefds))) {
        printf("connect success\n");
    } else {
        printf("connect error\n");
    return;
    }

    send(sock, "1234", 4, 0);// send something

    FD_ZERO(&readfds);
    FD_SET(sock, &readfds);
    rc = select(sock, &readfds, NULL, NULL, &tv);

    printf("read\n");


    if((rc == 1) && (FD_ISSET(sock, &readfds))) { // get the answer and display
        bytesRcvd = recv(sock, echoBuffer, RCVBUFSIZE - 1, 0);
        printf("received %d bytes\n", bytesRcvd);
        printf("%s\n", echoBuffer);
        } else {
    printf("read error\n");
    return; 
    }

    WSACleanup();  // Cleanup Winsock
}

bytesRcvd = recv(sock, echoBuffer, RCVBUFSIZE - 1, 0);
echoBuffer[bytesRcvd] = '\0';

char buff[5];
memset( buff, 0, sizeof(buff) );
strncpy( buff, anotherstring, sizeof(buff) );