Re: [lwip-users] sys_timeout() handler never being triggered in mqtt.c

[address@hidden]

Am 19.06.2022 um 22:05 schrieb inceljoe via lwip-users:
> Good day everybody,
> I was trying to use the mqtt functionality which is included in LwIP at
> LwIP/src/apps/mqtt. I am using LwIP alongside FreeRTOS on a STM32
> microcontroller.
>
> The MQTT server requires the client to send a ping packet every few
> seconds, by reading the code I found out this functionality is
> implemented with a sys_timeout() at line 1066 in mqtt.c . This is the
> line in particular:
> /sys_timeout(MQTT_CYCLIC_TIMER_INTERVAL * 1000, mqtt_cyclic_timer, client);/
>
> But the problem is, that the /mqtt_cyclic_timer /function isn't
> triggered at all, not even once. I put a breakpoint into it and it was
> never hit.
>
> The tick source given to the /sys_now()/ works fine and increases by one
> every millisecond so I have no idea why the sys_timeout() function
> doesn't run the handler function even once. Can anyone help me? Thanks
> for your time.

Do other timeout handlers get triggered at all? Is your port's timeout
handling working correctly? For that, you either have to use
tcpip_init() to get multithreading running, or call sys_timeouts_check()
yourself when using lwIP in main-loop style.

Regards,
Simon