Re: [lwip-users] Handshake trouble when packet is lost

[Kieran Mansley]

On Thu, 2011-05-05 at 18:38 +0200, Cristiano Toninato - Research &
Development - CET wrote:
> Ok, but our application should work in a LAN, with an RS485 backup (if
> the Ethernet does not work).
> Normally all works within few tenths of second, and we cannot lose
> control of the system, after 3 seconds not working on LAN we should
> switch on RS485.

For a specialised control application like this you might want to
consider avoiding TCP altogether as it doesn't have the real-time
properties that you'll need.  You would then have to implement your own
transport layer (perhaps on top of UDP), or make do with just UDP if
uncorrected packet loss isn't a problem.

Kieran