Re: [lwip-users] contrib/apps/chargen/chargen.c doesn't receive any packet

[Simon Goldschmidt]

>From your post it is not clear whether you understood the principle of using 
>threads with lwIP: the core is not protected against concurrent access, 
>therefore the RAW api may only be used from one thread at a time, which is the 
>tcpip_thread (started in tcpip_init) if you use the other APIs. However, you 
>call udp_new etc. from the first thread while the tcpip_thread also works on 
>core functions. Hence you will have two threads using the core at the same 
>time which will eventually lead to problems.

Also, I think your initialization is wrong, you should take a look at 
initialization in the win32 port in CVS for example (I think you have to add 
the netif first and then call lwip_init, which calls tcpip_init in turn).

If that still doesn't work I suggest you have a problem with your port (e.g. an 
old port for lwIP 1.2.0?). You should check that the tcpip_thread is started 
correctly and gets the messages e.g. sent to it when calling socket(). 
Semaphore initialization (initialized to 0 instead of 1 ignoring the argument 
on craetion) has also often been a problem.

Simon

-------- Original-Nachricht --------
> Datum: Wed, 30 Jul 2008 13:17:53 +0800
> Von: "stanliao" <address@hidden>
> An: address@hidden
> Betreff: [lwip-users] contrib/apps/chargen/chargen.c doesn\'t receive any     
> packet

> Dear All,
> 
>  
> 
> I downloaded LWIP and added some port code to adapt LWIP to ucOS/II.
> Currently, the overall program can send UDP to network-world; but when I
> use
> "chargen" as the test program, chargen_thread() hangs at i =
> select(maxfdp1,
> &readset, &writeset, 0, 0); statement in "chargen.c". Please refer to the
> following program for the LWIP initialization. I traced into "raw.c"
> raw_input() function and found that the global variable raw_pcbs is 0
> (NULL)
> while receiving a packet. Then, I traced whether any pcb is created! I
> found
> that chargen_thread() calls socket(); socket() calls
> netconn_new_with_proto_and_callback(); the comment for
> netconn_new_with_proto_and_callback() says that the corresponding pcb is
> also created, however, do_newconn() is never called to create pcb. Is
> there
> anything (configuration or initialization) I missed? Thank you very much.
> 
>  
> 
> Best Regards,
> 
> Stan Liao
> 
>  
> 
> --- (initialization)
> 
>          /* initialize lwip */
> 
>          tcpip_init(NULL,NULL);
> 
>  
> 
>          /* initialize net interface (TODO: replace this hard-copy
> address)*/
> 
>          IP4_ADDR(&eth0_ipaddr,  172,  16, 101, 3);
> 
>          IP4_ADDR(&eth0_netmask, 255, 255, 255, 0);
> 
>          IP4_ADDR(&eth0_gw,      172,  16, 101, 254);
> 
> #if LWIP_ARP
> 
>          netif_add(&eth0_netif, &eth0_ipaddr, &eth0_netmask, &eth0_gw,
> NULL,
> ethernetif_init, ethernet_input);
> 
> #else
> 
>     netif_add(&eth0_netif, &eth0_ipaddr, &eth0_netmask, &eth0_gw, NULL,
> ethernetif_init, ip_input);
> 
> #endif
> 
>          netif_set_default(&eth0_netif);
> 
>          netif_set_up(&eth0_netif);
> 
>  
> 
>          OSTimeDly(OS_TICKS_PER_SEC);
> 
>  
> 
>          /* initialize applications */
> 
> #ifdef TE_TEST_CHARGEN
> 
>          chargen_init();
> 
> #endif
> 
> //#ifdef TE_TEST_HTTPSERVER_RAW
> 
> #if 0
> 
>          httpd_init();
> 
> #endif
> 
>  
> 
> #if 0
> 
> {
> 
>          struct udp_pcb *UDP_PCB;
> 
>          err_t result;
> 
>          struct ip_addr remote_ipaddr;
> 
>          struct pbuf *buffer, *p;
> 
>          int idx;
> 
>          char sendString[32];
> 
>  
> 
>          IP4_ADDR(&remote_ipaddr, 172, 16, 101, 134);
> 
>  
> 
>          UDP_PCB = udp_new();
> 
>          if (!UDP_PCB)
> 
>                   return;
> 
>  
> 
>          result = udp_bind(UDP_PCB, &eth0_ipaddr, 333);
> 
>          if (result != ERR_OK)
> 
>          {
> 
>                   udp_remove(UDP_PCB);
> 
>                   return;
> 
>          }
> 
>  
> 
>          //udp_recv(UDP_PCB, UDP_Receiver, NULL);
> 
>          udp_connect(UDP_PCB, &remote_ipaddr, 333);
> 
>  
> 
>          buffer = pbuf_alloc(PBUF_RAW, 512, PBUF_POOL);
> 
>          for (p = buffer; p != NULL; p = p->next)
> 
>          {
> 
>                   for (idx = 0; idx < p->len; ++idx)
> 
>                           ((char *) (p->payload))[idx] = ' ';
> 
>          }
> 
>  
> 
>          for (idx = 0; ; ++idx)
> 
>          {
> 
>                   udp_send(UDP_PCB, buffer);
> 
>                   if (idx % 100 == 0)
> 
>                           sysInfo("send packet_%d\r\n", idx);
> 
>                   OSTimeDly(OS_TICKS_PER_SEC/30);
> 
>          }
> 
> }
> 
> #endif
> 
> ---
> 
>  
> 

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