Am 07.02.2019 um 16:36 schrieb Jasper Verschueren:
Hi,
I'm running the lwIP latest master on a NXP - K64F without operating
system and I'm having some troubles with TCP.
I'm using a stripped down version of the httpd and added a simple HTTP
POST command protocol to it. This command protocol is keeping the device
and webapp in sync.
A webapp is sending POST messages to my device with the webapp state in
it every +-60ms. The httpd sets a flag when it receives such a message.
In main loop we evaluate the flag, if true we evaluate the received
webapp state and send a HTTP OK with the latest device state in it. From
this main loop flag check we construct the message, we call http_send
and directly after tcp_output.
(I know this polling method is far from ideal but it was a quick
implementation before we continue with websockets.)
It works great except that on completely random moments lwIP crashes and
the complete MCU is halted.
From time to time I get following assert when that happens:
LWIP_ASSERT("pcb->snd_queuelen >= pbuf_clen(next->p)",
(pcb->snd_queuelen >= clen));
There are also moments were no assert is triggered and it just crashes
(or maybe the assert message is not printed on these occasions i'm not
sure).
I have been evaluating the code that influences snd_queuelen and I
noticed that there are some open tcp bugs at the moment that can have
influence on sequence numbers and ack's.
I'm not aware of any having an effect on snd_queuelen. Could you point
me at the ones you mean?
Regards,
Simon
It would really help if someone could point me in the right direction.
Thanks!
Jasper
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