I've implemented lwIP on following hardware:
CC1312R (ARM Cortex M4F) - TI Launchpad Board,
lwIP 2.1 in operation system mode (TI-RTOS),
My lwIP MQTT client (the one which comes with the
stack) succesfully connects to the broker and can both
publish and subscribe.
At this moment I'm testing only publishing (one publish
per second) - the messages are published without problem
for some time (one time it is about 50 publish packets,
one time 300), then the communication stops.
I've recorded packets using Wireshark (with MQTT and
TCP filters). IP 192.168.1.171 is lwIP, 220.127.116.11 is
What I can observe is that lwIP somehow can't handle
TCP retransmission packets properly.
I don't have any messages about too small memory or
assertions before communication stops.
What can I do more to solve my problem? Did you see
something like that?
I'm attaching .pcap file with described problem (at the
end of file).