Asset Tracker v2 - How to monitor the On/Off state of the sliding switches: sw1 and sw2 reported every minute from the nRF9160DK device to a topic of the AWS IoT Core?

Hi,

When I tried to introduce some changes to the "Asset Tracker v2" application's src files, I saw the following error message on the LTE Link Monitor, when I tried to run this application:

"[1,31m<err> aws-iot: Cloud MQTT input error: -16", shown line after line, as can be seen on the attached LTE Link Monitor log file: "LTE Link Monitor log 2022-01-27".

I then removed from the src files for "Asset Tracker v2" app all changes that I introduced recently but the problem still persisted and the above mentioned error message kept coming on the LTE Link Monitor when I tried to run this application.

I then tried to build and run the sample "aws_iot" and it seemed to work OK as per the attached LTE Link Monitor log file: "log_file_for_aws_iot_sample_27_01_2022".

How can I rectify the error "aws-iot: Cloud MQTT input error: -16" that keeps coming on the LTE Link Monitor when I try to run the "Asset Tracker v2" app ?

Regards,

JM

Hi,

When I tried to introduce some changes to the "Asset Tracker v2" application's src files, I saw the following error message on the LTE Link Monitor, when I tried to run this application:

"[1,31m<err> aws-iot: Cloud MQTT input error: -16", shown line after line, as can be seen on the attached LTE Link Monitor log file: "LTE Link Monitor log 2022-01-27".

I then removed from the src files for "Asset Tracker v2" app all changes that I introduced recently but the problem still persisted and the above mentioned error message kept coming on the LTE Link Monitor when I tried to run this application.

I then tried to build and run the sample "aws_iot" and it seemed to work OK as per the attached LTE Link Monitor log file: "log_file_for_aws_iot_sample_27_01_2022".

How can I rectify the error "aws-iot: Cloud MQTT input error: -16" that keeps coming on the LTE Link Monitor when I try to run the "Asset Tracker v2" app ?

Regards,

JM

Hi,

Jacekma said:

How can I rectify the error "aws-iot: Cloud MQTT input error: -16" that keeps coming on the LTE Link Monitor when I try to run the "Asset Tracker v2" app ?

-16 is EBUSY:

mqtt_input -> client_read, which returns EBUSY when the socket is still writing (ie. uploading) data:

https://github.com/nrfconnect/sdk-zephyr/blob/v2.7.0-ncs1/subsys/net/lib/mqtt/mqtt.c#L117

Before the above error is printed, you are seeing:

2022-01-27T08:06:19.469Z DEBUG modem << [00:00:29.372,650] [1;31m<err> aws_iot: Incoming MQTT message too large for payload buffer[0m
2022-01-27T08:06:19.495Z DEBUG modem << [00:00:29.381,072] [1;31m<err> aws_iot: publish_get_payload, error: -122

How large is the payload you're sending?

Kind regards,

Håkon