Android : android UDP socket could not send packet

I am new two android.I want to send data from a android phone (socket client) to my PC (socket server). I connect my android phone to PC via usb cable. I forward the tcp port 8888 to my pc using adb forward command. I have written a UDP server program for my pc and a UDP client program for the android phone. Here is my code

Server:

int main()
{
    WSADATA w;                          /* Used to open windows connection */
    unsigned short port_number;         /* Port number to use */
            /* Components of address in xxx.xxx.xxx.xxx form */
    int client_length;                  /* Length of client struct */
    int bytes_received;                 /* Bytes received from client */
    SOCKET sd;                          /* Socket descriptor of server */
    struct sockaddr_in server;          /* Information about the server */
    struct sockaddr_in client;          /* Information about the client */
    char buffer[BUFFER_SIZE];           /* Where to store received data */
    struct hostent *hp;                 /* Information about this computer */
    char host_name[256];                /* Name of the server */
    time_t current_time;                /* Current time */


    /* Open windows connection */
    if (WSAStartup(0x0101, &w) != 0)
    {
        fprintf(stderr, "Could not open Windows connection.\n");
        exit(0);
    }

    /* Open a datagram socket */
    sd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sd == INVALID_SOCKET)
    {
        fprintf(stderr, "Could not create socket.\n");
        WSACleanup();
        exit(0);
    }

    /* Clear out server struct */
    memset((void *)&server, '\0', sizeof(struct sockaddr_in));

    /* Set family and port */
    server.sin_family = AF_INET;
    server.sin_port = htons(8888);
    server.sin_addr.s_addr =inet_addr("127.0.0.1");// htonl(INADDR_ANY);


    /* Bind address to socket */
    if (bind(sd, (struct sockaddr *)&server, sizeof(struct sockaddr_in)) == -1)
    {
        fprintf(stderr, "Could not bind name to socket.\n");
        closesocket(sd);
        WSACleanup();
        exit(0);
    }

    printf("\n Server starts running....");
    printf("Press CTRL + C to quit\n");

    /* Loop and get data from clients */
    while (1)
    {
        client_length = (int)sizeof(struct sockaddr_in);

        /* Receive bytes from client */
        bytes_received = recvfrom(sd, buffer, BUFFER_SIZE, 0, (struct sockaddr *)&client, &client_length);
        if (bytes_received < 0)
        {
            fprintf(stderr, "Could not receive datagram.\n");
            closesocket(sd);
            WSACleanup();
            exit(0);
        }

        printf("\n Revd data from client...");

        strcpy(buffer,"\nThis is reply from server....");
            /* Check for time request */

            /* Get current time */
            current_time = time(NULL);

            /* Send data back */
            if (sendto(sd, (char *)&buffer, (int)sizeof(buffer), 0, (struct sockaddr *)&client, client_length) != (int)sizeof(buffer))
            {
                fprintf(stderr, "Error sending datagram.\n");
                closesocket(sd);
                WSACleanup();
                exit(0);
            }

    }
    closesocket(sd);
    WSACleanup();

    return 0;
}

Client:

int main()
{

                /* The port number to use */
    int sd,byte;                                /* The socket descriptor */
    int server_length;                      /* Length of server struct */
    char send_buffer[1024] = "GET TIME\r\n";/* Data to send */

    struct sockaddr_in server;              /* Information about the server */

                    /* Host name of this computer */
    char rec_buff[1024];

    /* Open a datagram socket */
    sd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sd <=0)
    {
        fprintf(stderr, "Could not create socket.\n");
        exit(0);
    }

    printf("\nSocket Created.....%d",sd);
    /* Clear out server struct */
    memset((void *)&server, '\0', sizeof(struct sockaddr_in));

    /* Set family and port */
    server.sin_family = AF_INET;
    server.sin_port = htons(8888);
    server.sin_addr.s_addr =inet_addr("127.0.0.1");// htonl(INADDR_ANY);


    /* Tranmsit data to get time */
    server_length = sizeof(struct sockaddr_in);
printf("\n Try to connect with server...%d",server_length);


byte=sendto(sd,(char *)&send_buffer, (int)strlen(send_buffer), 0, (struct sockaddr *)&server, server_length);

printf("\nSend byte ...%d",byte);
    if (byte<0)
    {
        fprintf(stderr, "Error transmitting data.\n");
        close(sd);
        //exit(0);
    }

    printf("\n Server connection established....");
    /* Receive time */
    if (recvfrom(sd, (char *)&rec_buff, (int)sizeof(rec_buff), 0, (struct sockaddr *)&server, &server_length) < 0)
    {
        fprintf(stderr, "Error receiving data.\n");
        close(sd);
        exit(0);
    }

    /* Display time */
    printf("Current time: %s", rec_buff);


    close(sd);

    return 0;
}

Here every time i am getting send byte as zero in the client side. need help..