mqtt simple + timer collision

[ephraim]

Dear Sir.

We are using software based on mqtt simple project .

We added a 1 hz timer, Every 1 hz we toggle a led on and off.

Sometime the led is stuck on " on " or " off  which means to me that the timer is not 

working fine or the mqtt routine in the background stops it.

Any idea how to debug this problem.

Please Advise.

[Sigurd Hellesvik]

Hi Ephraim,

My guess is that this is due to scheduling.

Could you post the code and configuration you use for the timer?

Regards,
Sigurd Hellesvik

[ephraim]

Hi.

In main.c  configure timer

k_timer_init(&my_timer, my_expiry_function, NULL); //Timer - 1 Hz
k_timer_start(&my_timer, K_MSEC(TIEMR_INTERVAL_SEC), K_SECONDS(TIEMR_INTERVAL_SEC)); //Timer - 1 Hz

void my_expiry_function(struct k_timer *timer_id)
{
k_work_submit(&work_top);
}

The code of mqtt is the same as in the project mqtt simple , turning on and off the mqtt

by issuing the commands   lte_lc_offline(); and lte_lc_normal();

Every time the the modem reconnect there is a delay in the timer ( see pic ). Sometimes the timer is stopped.

Please Advise.

[ephraim]

Hi.

Another input.

I have found the following is responsible for the timer's mismatch

if((get_mqtt_conn_flag() == 1)) { // && (gtimer > 50)) {
printk("Try to connect - 1, %d \n",gtimer);
lte_lc_offline();
set_mqtt_conn_flag(3);
} else if (get_mqtt_conn_flag() == 2) {
printk("Try to connect - 2, %d \n",gtimer);
lte_lc_normal();
battery_value = get_battery_value();
set_latest_valid_battery_value(battery_value);
set_mqtt_conn_flag(3);
}

It is either the lte_lc_offline(); or the lte_lc_normal(); 

Please Advise

[Sigurd Hellesvik]

Hi

If you se LOG_INF to log inside "my_expiry_function()", you should get prints with timestamps.
Then log inside the work done by "work_top".

This will help us find if the delay is in the timer or the work queue.

Regards,
Sigurd Hellesvik