Re: [lwip-users] Best way for determining if a TCP connection is dead?

[Stephen Cowell]

I had to access my PHY chip to get the status of the line... using 1.4.1 
here on an Atmel SAME4E.

...
      gmac_enable_management(GMAC, true);
      gmac_phy_read(GMAC, BOARD_GMAC_PHY_ADDR, GMII_BMSR, &ul_stat1);// 
get status from PHY
      gmac_enable_management(GMAC, false);

      if ((ul_stat1 & GMII_LINK_STATUS) == 0)
      {
          // do something...
      }
...

I'm using no OS (RAW) and doing this in main loop time... giant PITA.  
Also, it's possible for a bad phy_read() to return all 1's... in which 
case you won't see the disconnect... dealing with that one now.
__
Steve
.

Stephen Cowell
Project Manager/Engineer
Plasmability LLC
Office (512) 267-7087
Cell  (512) 632-8593
www.plasmability.com

On 1/24/2018 10:35 AM, Chris Seto wrote:
> I have some code which works great, based on the echo client example.
>
> I'm working on hardening it, and I'm wondering with how best to deal 
> with a dead TCP connection as a result of the network link being down 
> (ie, Ethernet cable disconnected).
>
> The echo client contains conditions for a software termination of the 
> socket (ie, server sends am empty frame), but I don't see anything 
> dealing with a more blunt loss of the connection.
>
> Any advice?
>
> Thanks,
> Chris
>
>
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