[En-Nut-Discussion] Detecting disconnet of the network cable

[Eric Haver]

Hi Joerg,

If you are using DHCP, you can try this:

Run a background thread that tries:

if (NutDnsGetHostByName("www.google.com")==0){
     //probably cable is unplugged
    printf("Can't resolve a URL")
}


*E


On Thu, Jun 12, 2008 at 8:20 AM, Wiegelmann, Jörg <
Joerg.Wiegelmann at ces-tronics.de> wrote:

> I'm using Ethernut with the EIR-SAM7 Hardware. I got data over a TCP-IP
> connection. When someone disconnects the network cable at the Ethernutboard,
> no softwarepart ist recognizing this.  I tried the following implementation,
> but without success. tcperr doesn't show any error on disconnecting.
>
>
>
> NutTcpAccept(sockin, PortListen);
>
>
> NutTcpSetSockOpt(sockin,SO_RCVTIMEO,&ulReceiveTimeout,sizeof(ulReceiveTimeout));
>
> do
>
>  {
>
>   Cnt=NutTcpReceive(sockin,buffer,BUFFER_SIZE);
>
>   tcperr = NutTcpError(sockin);
>
>  }while(tcperr==0);
>
>
>
> any Idea?
>
> Best regards and thank you
>
> Joerg.
>
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