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RE: [lwip-users] TCP not sending initial ACK

From: Chuck Kuecker
Subject: RE: [lwip-users] TCP not sending initial ACK
Date: Wed, 26 Aug 2009 10:54:42 -0500

No, the LWIP timers are called from the main timer tick, and there are
no other threads. This is how LWIP is set up for the Luminary driver
library I am using, and it has always worked before.

Wireshark shows no defective packets.


-----Original Message-----
From: address@hidden
[mailto:address@hidden On
Behalf Of address@hidden
Sent: Wednesday, August 26, 2009 10:34 AM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] TCP not sending initial ACK

Chuck Kuecker wrote:
> I've tried changing the frequency of LWIP interrupt handler calls, 
> both greatly slowing and speeding them up, with no apparent change in 
> behavior.
What exactly do you mean with "interrupt handler calls"? The timers? 
They should *not* be called from an interrupt level: the core code of 
lwIP may only be accessed from one context at a time!

If you obeyed this rule and still have problems, have a look at 
wireshark packet traces and see if it reports errors in a packet. Also, 
have a look at the stats (turn them on in lwipopts.h if not already 
done) and find out whether there are packets dropped.


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