Re: [lwip-users] Connection freeze after 29200 Bytes

[Jan Menzel]

That smells like you started with a 32k buffer and did not free the
memory on receive.

On 06.08.2016 13:03, Norbert Kleber wrote:
> Hello everyone,
> 
> I ran into a problem while implementing the LwIP stack v1.3.2 onto the
> STM32F4 Evalboard.
> My Intention is to build a bootloader application while using Raw API. I
> want to transmit the .bin file in Parts of 64kB (matching the CCM) to
> the microcontroller, put it into the CCM and after that is filled or all
> data is transmitted to write the data into the FLASH. As long the file
> to transfer is smaller than this magical 29200 Bytes every thing works
> fine, but if it exceeds that limit the TCP connection freezes after
> transmitting the 29200Bytes. Wireshark didn't see any messages following
> that freeze not even a keep alive message. If i stop my terminal program
> that is sending the data the frame for closing the connection is send
> and answered. To control the data transmission i have a second tcp
> connection to another port where i am sending control instructions like
> how many bytes to expect. The acknowledgements to these frames had
> somehow a decreasing window size.
> That happens as follows: //
> 
>  1. frame window is 2920
>  2. receive frame length 13
>  3. ack frame window 2907
> 
>  Is there a mistake in interfacing the lwIP stack? The windowsize update
> function is disabled.
> 
> I took the driver as well as the interface out of the ethernet example
> for STM32F4Evalboar + STM32F4DIS-BB from element 14.
> 
> i would be grateful for any hint.
> 
> sincerly,
> 
> Norbert
> 
> 
> 
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