RE: [lwip-users] dhcp and bsd socket library for lwIP

[Muhamad Ikhwan Ismail]

          Hi,

          1.To initialize the stack you should call the function tcpip_init(). You might have to change some stuffs depending on your implementation
             e.g. in my case i neeeded to call the memp_init earlier due to the fact my driver needs the pbuf pool for it's initialization.

          2.This is an example how i initialized my DHCP (version 1.2) but i dont think it differed that much

             my_ethernet = (struct netif*)mallocx(sizeof(struct netif));
  
            netif_init();
            netif_add(my_ethernet,NULL,NULL,NULL,NULL,ethernetif_init,tcpip_input);
       
            /*bring the netif up if using static IP, otherwise dhcp will do it*/
            #if LWIP_DHCP
            #include "..\..\lwip\src\include\lwip\dhcp.h
     
            dhcp_start(my_ethernet);
            //ready the timeout in case dhcp fails, which handles by assigning dummy address
            sys_timeout(DHCP_FAILURE_INTERVAL, (sys_timeout_handler)dhcp_failure_handler, NULL);
            //use sys_timeout for dhcp timers instead of calling on interval in tcpip_thread
            sys_timeout(DHCP_FINE_TIMER_MSECS,(sys_timeout_handler)dhcp_fine_tmrhandler,NULL);
            sys_timeout((1000*DHCP_COARSE_TIMER_SECS),(sys_timeout_handler)dhcp_coarse_tmrhandler,NULL);
   
        #else /*no LWIP_DHCP*/
        ip_addr_set(&(my_ethernet->ip_addr),&dummyadd);
        ip_addr_set(&(my_ethernet->netmask),&dummymsk);
        ip_addr_set(&(my_ethernet->gw),&dummygtw);
        netif_set_up(my_ethernet);             
        netif_set_default(my_ethernet);
    #    endif//#if LWIP_DHCP

          You might wanna take note, that you should sleep all your applications a few seconds to allow the DHCP process to complete.
          This function for me is called during initialization (by a thread that does all the initialization). The TCP IP thread also is created there for me though
          that is very much imo up to your implementation.

          To check your ip address just view the variable of your netif during debugging.

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Date: Wed, 21 May 2008 00:11:59 -0700
From: address@hidden
To: address@hidden
Subject: [lwip-users] dhcp and bsd socket library for lwIP

Hi,
I am new in using lwIP. I need some help.
1. I am trying to use BSD soket library that is supported in lwIP, means I am trying to use socket, sendto etc functions instead of netconn_** functions. I have seen some examples in contrib folder but I still have following doubts:

1. How should I do the initializations? which functions should I call to initialize the stack?
I want to use dhcp. Do you have any source code (of any server/client program) as an example where I can find how to use the DHCP calls? I would be interested to know when DHCP is up, how do I find out the IP address(and subnet mask) that I have got?

So kindly share any source code/project where I can findout the initialization sequence of the stack for using dhcp with BSD socket library functions.

Thanking you in advance,
Ted.

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