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Re: [lwip-users] Acknowledge Problem

From: martin5523
Subject: Re: [lwip-users] Acknowledge Problem
Date: Fri, 8 Apr 2016 05:34:49 -0700 (MST)

We added a WireShark file where you can see our errors.
It's still the problem receiving a small web page from the webserver on the
When we program the device with our code, we receive the web page after
short time without errors.
But after one good attempt, all other attempts result in many tcp errors and
every new try lasts longer.
( = XMC4500, = pc)

1st try (no. 2 to 24): good - time: 56 ms
- no. 12/13 -> 2nd tcp port (58772) starts after 1st tcp port (58771) is

2nd try (no. 33 to 68): with errors - time: 5.6 sec
- no.40/41 -> after 30 ms waiting for last ack from 1st tcp port (58778) pc
starts 2nd tcp port (58779)
- no.41/43 -> after 250 ms waiting for syn,ack from 2nd tcp port (58779) pc
starts 3rd tcp port (58780)
- 2nd and 3rd tcp port work for almost the rest of the time parallel und
send many corrupt frames (false data and doubled acks)

3rd try (no. 80 to 123): with errors - time: 15.2 sec
- no. 80/82/83 1st syn,ack handshake lasts 200 ms
- later many double acks and corrupt data frames

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