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

[Joel Cunningham]

On 01/24/2018 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).

This is a great source for dealing with half-open TCP connections due to all kinds of conditions:

https://www.codeproject.com/Articles/37490/Detection-of-Half-Open-Dropped-TCP-IP-Socket-Conne

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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Joel