Re: [lwip-users] LWIP Simple echo server:

[address@hidden]

You did not say which platform you are running on nor which version of 
lwIP you are using. Please download the contrib module and take a look 
at the example applications in the windows or unix port to get an idea 
of how to start with lwIP.

Simon


sandy tewari wrote:
>  I am new to LWIP and im trying to build a echo server application 
> using Sockets API, i dont know what i am doing wrong, im guessing i am 
> not initialising few modules or something. pls help.
>
> main.c
> **********************************************
> int main(){
>   printf("Main ");
>   socketserver_init();
>   return 0;
> }
> ****************************************************
> server.c
>
> #include <unistd.h>
> #include <getopt.h>
>
> #include "lwip/init.h"
>
> #include "lwip/debug.h"
>
> #include "lwip/mem.h"
> #include "lwip/memp.h"
> #include "lwip/sys.h"
>
> #include "lwip/stats.h"
>
> #include "lwip/ip.h"
> #include "lwip/ip_frag.h"
> #include "lwip/udp.h"
> #include "lwip/snmp_msg.h"
> #include "lwip/tcp.h"
> #include "lwip/tcpip.h"
> #include "lwip/sockets.h"
> #include "mintapif.h"
> #include "netif/etharp.h"
>
> #include "timer.h"
> //#include "sys/socket.h"
> //#include <arpa/inet.h>
>
> #include <signal.h>
>
> #include "server.h"
> #include "private_mib.h"
> #define MY_PORT         9999
> #define MAXBUF          1024
> /* nonstatic debug cmd option, exported in lwipopts.h */
> unsigned char debug_flags;
>
> void socketserver_thread();
>
> void socketserver_init(void)
> {
>   debug_flags = LWIP_DBG_ON;
>   sys_thread_new("socketserver_thread", socketserver_thread, NULL, 
> DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO); 
> }
>
> // Sequential APIs have to be a part of separate thread
> void socketserver_thread(){
>   int sockfd;
>   struct sockaddr_in self;
>   char *buffer;
>   lwip_socket_init();
>
>
>
>   printf("//Creating stream socket");
>   if((sockfd = lwip_socket(PF_INET, SOCK_STREAM,0)) < 0)
>   {
>       printf("Socket error");
>       return -1;
>   }
>
>   // Initialise address/port structure
>   bzero(&self, sizeof(self));
>   self.sin_family = AF_INET;
>   self.sin_port = htons(MY_PORT);
>   self.sin_addr.s_addr = INADDR_ANY;
>
>   // Bind the socket to port
>   if ( lwip_bind(sockfd, (struct sockaddr*)&self, sizeof(self)) != 0 )
>   {
>      printf("socket--bind error");
>      return -1;
>   }
>
>   // Make it a listening socket
>   if( lwip_listen(sockfd, 20) != 0)
>   {
>      printf("socket--listen error");
>      return -1;
>   }
>   /*---Forever... ---*/
>   while (1)
>   {   
>       printf("WAiting for connection");
>       int clientfd;
>       struct sockaddr_in client_addr;
>       int addrlen=sizeof(client_addr);
>       /*---accept a connection (creating a data pipe)---*/
>       clientfd = lwip_accept(sockfd, (struct sockaddr*)&client_addr, 
> &addrlen);
>       printf("%s:%d connected\n", inet_ntoa(client_addr.sin_addr), 
> ntohs(client_addr.sin_port));
>
>       /*---Echo back anything sent---*/
>       lwip_send(clientfd, buffer, recv(clientfd, buffer, MAXBUF, 0), 0);
>
>       /*---Close data connection---*/
>       lwip_close(clientfd);
>   }
>
>   /*---Clean up (should never get here!)---*/
>   close(sockfd);
>   return 0;
> }
> ***********************************************************************
>
> ------------------------------------------------------------------------
>
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