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[lwip-devel] [bug #65630] issue to download file bigger than 6KB using u
From: |
Stefano Oliveri |
Subject: |
[lwip-devel] [bug #65630] issue to download file bigger than 6KB using using https protocol |
Date: |
Tue, 30 Apr 2024 11:22:25 -0400 (EDT) |
Follow-up Comment #1, bug #65630 (group lwip):
Hello,
I was able, finally, to move forward and make my application works.
The issue I noted (I am sure it depends on my integration of lwIP and Mbed TLS
in the application), analyzing the communication sniffed with Wireshark, was a
TCP Zero Window. I am trying to understand this mechanism, so any comment is
welcome.
This TCP window size depends on the TCP_WND. At the beginning it 7300 in my
case, and it worked fine without TLS. When I added the support the TCP window
start to shrink when I download "not small" file until the Zero Window problem
occurs.
By increasing TCP_WND up to 21900 my application (seems to) works fine with
both http and https.
There are a couple of question in my mind I would like to understand:
1. is this analysis correct? Is that the root cause? Or the TCP/IP should be
able to work also with small TCP Window?
2. How to size correctly the TCP_WND option?
Best regards,
Stefano
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