nrf9160: mqtt_publish blocking - stuck at mutex_lock

RE: nrf9160: mqtt_publish blocking - stuck at mutex_lock

Brett — Sun, 06 Nov 2022 09:09:31 GMT

Hi Janathan,

I did not find a solution, yet, but I will need to at some stage.

I have worked around this for the moment by using 2 x thingy91's.
1 for GPS and the other for ANT/UART, not ideal but it works for the PoC I have running. Once I move closer to the final solution, I will need to find a way to buffer and batch process the data - but that wont be until later this year or early next year.

regards
-brett

RE: nrf9160: mqtt_publish blocking - stuck at mutex_lock

JONATHAN LL — Fri, 04 Nov 2022 11:47:13 GMT

Did you find a solution ?

RE: nrf9160: mqtt_publish blocking - stuck at mutex_lock

Brett — Wed, 06 Jul 2022 07:12:03 GMT

devzone.nordicsemi.com/.../7217.prj.txt
This is my prj.conf file if it helps

RE: nrf9160: mqtt_publish blocking - stuck at mutex_lock

Brett — Wed, 06 Jul 2022 07:08:40 GMT

Hi Jonathan,

CONFIG_MQTT_KEEPALIVE=1200

reconnect is not defined.

The strange thing is, it sends the first packet fine its only when it sends the 2nd packet that it locks up and this send is basically immediately, as I have 10 packets buffered in a queue to send.

Is there anything that I need to consider when doing batch processing like this ? Timing or ?
Do I need to consider a different MQTT setting ?

Do I need to consider any ACK packets for MQTT or is all this managed by the underlying protocol stack. I dont really understand the full implementations of poll, mqtt_live and mqtt_input functions and if I need to manage any of these after I do the send. In this instance the code is a producer only - no subscribe required.

I understand the basics, but not sure if I am missing anything. Happy to share the code I am using if that helps. Its a bit ugly at the moment, with all the debug print statements :)

regards
-brett

RE: nrf9160: mqtt_publish blocking - stuck at mutex_lock

JONATHAN LL — Tue, 05 Jul 2022 14:27:10 GMT

There are some configuration options to considder, https://github.com/nrfconnect/sdk-nrf/tree/v1.6.0/samples/nrf9160/mqtt_simple#configuration

Do you have a reconnect defined or a keepalive?

Regards,
Jonathan

RE: nrf9160: mqtt_publish blocking - stuck at mutex_lock

JONATHAN LL — Fri, 01 Jul 2022 14:55:41 GMT

Hi, We have entered the summer holiday period in Norway so staffing is low, so some delayed response time is expected.
Regards,
Jonathan

RE: nrf9160: mqtt_publish blocking - stuck at mutex_lock

Brett — Wed, 29 Jun 2022 01:15:10 GMT

I forgot to add, this is running from the v1.6.0 SDK.

I tried 1.7.0 but had issues when loading and booting the code, so went back to 1.6.0.

I tried to go to 2.0.0, but too many breaking changes for now - I will migrate there when I have more time.