Re: [lwip-users] Missing Ack and TCP retransmission

[Jaws]

Hi,
I want to add that the issue is caused to a no memory available for pbuf allocation.
Enabling PBUF_DEBUG we have seen continuosly this message after about 20 connection to a server: pbuf_alloc(length=1536).
After that, the connection to wifi router through HD wifi driver went down.
It seems some memory leak on lwip stack. Attached the log with pbuf alloc-free.
Let me know if you have any suggestion how to find where is the issue.

Thanks in advance.
Jaws




On 06/02/2012 06:23 PM, Jaws wrote:

Hi,
my embedded application send to Cosm some sensor data every 15 secs.
Everything works fine for about 20 connections.
At some point there is a TCP retransmission due to, I am supposing, a
missing ACK. After that no data is received from the Cosm Server and the
connection doesn't complete properly.

In attach the pcap captured for the connections, the issue is present starting form packet n.201.

Any suggestion is welcome.

I am using lwip 1.3.2.

Thanks
Jaws

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putty.log.tar.gz
Description: GNU Zip compressed data