[lwip-users] LWIP raw TCP socket disconnection

[Frédéric Grandjean]

Hi,

I’m using LWIP 1.4.1 and I’m facing an issue with “brutal” raw socket disconnection.

 

Imagine the following scenario:

-          Create a TCP_PCB listener (server)

-          On connection from a remote host (a Windows PC), accept it, with all callbacks

-          Now, I remove the Ethernet cable from my application

-          I also exit (brutally) the remote client application

-          Now, I wait 1 minutes and connect back the Ethernet cable

-          LWIP never signals the connection is lost, not the state of the PCB tells me (Still ESTABLISHED)!

 

 

How to detect this kind of disconnection ?

 

Thank you

Fred