Ethernet Stop working

when I remove this part

        if (tcp_check_send(socket) ){
        sprintf(msg,"W%04d%04d%04d%04d%04d%04d%04d%04d%05dR\n",10,20,30,40,50,60,70,80,90);
        len=sizeof(msg);
        sendbuf = tcp_get_buf (len);
        memcpy (sendbuf, msg, len);
        tcp_send (socket, sendbuf,len);
                                }

I can connect to my chip but it shows only
W0010002000300040005000600070008000090R
for the once and do nothing.However in this statues connection is alive.(but send nothing more).In addition when I add the above code I can't open the port and I fail to connect to my chip.

what is my mistake?

No while(1)...?

Sorry I pasted badly

int main (void) {

        net_initialize();
        socket = tcp_get_socket (TCP_TYPE_SERVER, 0, 20, tcp_callback);

                if (socket) {
                tcp_listen (socket, 4050);
                }

                while (1)
                {
                 net_main();

        if (tcp_check_send(socket) ){
        sprintf(msg,"W%04d%04d%04d%04d%04d%04d%04d%04d%05dR\n",10,20,30,40,50,60,70,80,90);
        len=sizeof(msg);
        sendbuf = tcp_get_buf (len);
        memcpy (sendbuf, msg, len);
        tcp_send (socket, sendbuf,len);
                                }

                                 osDelay (1000);

                }

}

Try calling tcp_get_state() before tcp_check_send(). Maybe socket is in state TCP_STATE_LISTEN, instead of TCP_STATE_CONNECT(ed). This may also help you with the other issue posted:
http://www.keil.com/forum/61112/

You are using network component v5/v6. Using the network's debug may help resolve issue:
www.keil.com/.../network_create_app.html

In the newest version (v7), netTCP_Send returns netStatus, which is more informative than tcp_send's boolean.

Dear Zack
Thank you for your explanation
I change my network component to V7 beta but in this states with this new code and other settings(Such as SPI and IP) I can't ping device's IP

#include "cmsis_os.h"
#include "rl_net.h"

uint32_t sock;
uint32_t Tcp_Stat(int32_t socket, netTCP_Event event, const NET_ADDR *addr, const uint8_t *buf, uint32_t len) ;
###########################################*/

int main (void) {
        netInitialize ();
        sock = netTCP_GetSocket (Tcp_Stat);
        netTCP_SetOption (sock, netTCP_OptionTOS, 30);
                if (sock >=0) {
                netTCP_Listen (sock, 2000);
        }

                while (1)
                {



                }

}


###########################################*/
uint32_t Tcp_Stat(int32_t socket, netTCP_Event event, const NET_ADDR *addr, const uint8_t *buf, uint32_t len) {
  switch (event) {
    case netTCP_EventConnect:return (1);
    case netTCP_EventEstablished:break;
    case netTCP_EventClosed :break;
    case netTCP_EventAborted:break;
    case netTCP_EventACK :break;
    case netTCP_EventData:break;
  }
  return (0);
}

what is my mistake?

What version of the Networking middleware are you using?

V7 beta

Please download the active version "Keil.MDK-Middleware.7.0.0.pack".
The beta version is actually older (I know that it is listed above).

Dear Reinhard Keil
Thank you
now I'm downloading MDK V7.
But I find my problem but it is too strange.
when I use sprintf without any variables with any size of string it works fine.

sprintf(msg,"HHHHHHHHHHellllooooooooooooooooo");

but as I add a little size variable to this command it doesn't work properly and I lose my connectivity or even it doesn't bind any port to my IP.

sprintf(msg,"W%04dR",10);

sprintf(msg,"W%04dR",var);

what do you think about this problem?

Hello
I download the MDK v7.0 but ping command (in my pc) can't detect my board IP.My all configs are the same as the old ones ( with MDK v6.5) but it doesn't do anything.

uint32_t Tcp_Stat(int32_t socket, netTCP_Event event, const NET_ADDR *addr, const uint8_t *buf, uint32_t len) ;

int main (void) {
        netInitialize ();
        sock = netTCP_GetSocket (Tcp_Stat);
        netTCP_SetOption (sock,netTCP_OptionTimeout, 120);
                if (sock >=0) {
                netTCP_Listen (sock, 4050);
        }


        while(1){}
}


uint32_t Tcp_Stat(int32_t socket, netTCP_Event event, const NET_ADDR *addr, const uint8_t *buf, uint32_t len) {
  switch (event) {
    case netTCP_EventConnect:return (1);
    case netTCP_EventEstablished:break;
    case netTCP_EventClosed :break;
    case netTCP_EventAborted:break;
    case netTCP_EventACK :break;
                case netTCP_EventData:break;
  }
  return (0);
}

should I do anything else?