F-stack Client not Connecting to F-stack Server

[SUDOsarvesh]

Hey F-stack Geeks,
I am New to F-stack. I am trying to make tcp connection via F-stack over dpdk(19.08). The example given in F-stack package creates server but when i am trying to connect that port from same or another pc It is not responding anything.Still in netstat it is showing that server is listening but i am not able to connect from my client application. I tried client application with n without (eg Winshock Client app) F-stack but nothing good.
Here is my f-stack client code.
#include <stdio.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <errno.h>
#include <assert.h>

#include "ff_config.h"
#include "ff_api.h"
#include "ff_epoll.h"

#define MAX_EVENTS 512

struct epoll_event ev;
struct epoll_event events[MAX_EVENTS];

int epfd;
int sockfd;

char html[] =
"HTTP/1.1 200 OK\r\n"
"Server: F-Stack\r\n"
"Date: Sat, 25 Feb 2017 09:26:33 GMT\r\n"
"Content-Type: text/html\r\n"
"Content-Length: 438\r\n"
"Last-Modified: Tue, 21 Feb 2017 09:44:03 GMT\r\n"
"Connection: keep-alive\r\n"
"Accept-Ranges: bytes\r\n"
"\r\n"
"\r\n"
"\r\n"
"\r\n"
"<title>Welcome to F-Stack!</title>\r\n"
"<style>\r\n"
" body { \r\n"
" width: 35em;\r\n"
" margin: 0 auto; \r\n"
" font-family: Tahoma, Verdana, Arial, sans-serif;\r\n"
" }\r\n"
"</style>\r\n"
"\r\n"
"\r\n"
"

Welcome to F-Stack!

\r\n"
"\r\n"
"

For online documentation and support please refer to\r\n"
"<a href="http://F-Stack.org/\">F-Stack.org.
\r\n"
"\r\n"
"

Thank you for using F-Stack.

\r\n"
"\r\n"
"";
struct sockaddr_in my_addr;
int loop(void arg)
{
/ Wait for events to happen */

int nevents = ff_epoll_wait(epfd,  events, MAX_EVENTS, 0);
int i;

for (i = 0; i < nevents; ++i) {
    /* Handle new connect */
    if (events[i].data.fd == sockfd) {
        while (1) {
            int nclientfd = ff_accept(sockfd, (struct linux_sockaddr *)&my_addr, sizeof(my_addr));
            if (nclientfd < 0) {
                break;
            }

            /* Add to event list */
            ev.data.fd = nclientfd;
            ev.events  = EPOLLIN;
            if (ff_epoll_ctl(epfd, EPOLL_CTL_ADD, nclientfd, &ev) != 0) {
                printf("ff_epoll_ctl failed:%d, %s\n", errno,
                    strerror(errno));
                break;
            }
        }
    } else { 
        if (events[i].events & EPOLLERR ) {
            /* Simply close socket */
            ff_epoll_ctl(epfd, EPOLL_CTL_DEL,  events[i].data.fd, NULL);
            ff_close(events[i].data.fd);
        } else if (events[i].events & EPOLLIN) {
            char buf[256];
            size_t readlen = ff_read( events[i].data.fd, buf, sizeof(buf));
            if(readlen > 0) {
                ff_write( events[i].data.fd, html, sizeof(html) - 1);
            } else {
                ff_epoll_ctl(epfd, EPOLL_CTL_DEL,  events[i].data.fd, NULL);
                ff_close( events[i].data.fd);
            }
        } else {
            printf("unknown event: %8.8X\n", events[i].events);
        }
    }
}

}

int main(int argc, char * argv[])
{
ff_init(argc, argv);

sockfd = ff_socket(AF_INET, SOCK_STREAM, 0);
printf("sockfd:%d\n", sockfd);
if (sockfd < 0) {
    printf("ff_socket failed\n");
    exit(1);
}

int on = 1;
ff_ioctl(sockfd, FIONBIO, &on);


bzero(&my_addr, sizeof(my_addr));
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(15231);
my_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

int ret = ff_bind(sockfd, (struct linux_sockaddr *)&my_addr, sizeof(my_addr));
if (ret < 0) {
    printf("ff_bind failed\n");
    exit(1);
}

ret = (ff_connect(sockfd, (struct linux_sockaddr *)&my_addr, sizeof(my_addr)) == -1);  //ff_connect
if (ret < 0) {
    printf("ff_listen failed\n");
    exit(1);
}

assert((epfd = ff_epoll_create(0)) > 0);
ev.data.fd = sockfd;
ev.events = EPOLLIN;
ff_epoll_ctl(epfd, EPOLL_CTL_ADD, sockfd, &ev);
ff_run(loop, NULL);
return 0;

}