LTE connect blocking while connecting to network

[dermot geraghty]

Hi,

I am developing an application based on the aws_iot sample which all works fine.

The application captures data from a sensor and publishes it to AWS.

However, during the connection phase which can be several minutes or when the connection is dropped the connect/ reconnect

blocks the work queue items and so no date is recorded during this time.

Can you explain how to work around this issue?

Thanks

[Albrecht Markus Schellenberger]

Hello, 

Can you explain how to work around this issue?

that is a little bit hard to offhand estimate without an application log.

Is there any difference in the code snippets that establish a connection to the network and the AWS server compared to the aws_iot sample? I’m especially thinking about line L523 and L356.

To start with, you could as well check the network registration status using +CEREG or %XMONITOR.

Regards,

Markus

[dermot geraghty]

Hi Markus,

I hope I haven't confused the issue here.

There is no problem connecting to the network generally and I haven't changed anything about k_sem_take or k_sem_give in the the lines cited.

I have added additional items to the work queue which is used for publishing to the AWS shadow and these work fine too.

My problem is that while connecting to the network I also want to read the data from a sensor and store it in memory while the connection thread is running. This can't  happen at the moment.

The idea being that I can record measurements while connecting and publish them when conneced.

Thanks

Dermot

[Albrecht Markus Schellenberger]

Hello Dermot,

dermot geraghty said:

There is no problem connecting to the network generally and I haven't changed anything about k_sem_take or k_sem_give in the the lines cited.

Thanks a lot for your feedback and clarifying the issue!

dermot geraghty said:

My problem is that while connecting to the network I also want to read the data from a sensor and store it in memory while the connection thread is running. This can't  happen at the moment.

Where exactly in the application have you implemented the functionality that reads data from a sensor?

Regards,

Markus

[dermot geraghty]

Hi Markus,

I have implemented the following as the first line  of main()

k_delayed_work_init(&led_update_work,led_update_work_fn);

which just toggles a LED every 5 secnds.

But it doesn't start until the device has connected.

Thanks

Dermot

[Albrecht Markus Schellenberger]

Hello Dermot,

k_(delayed)_work_init only initialises the work structure. As described in this chapter, you have to submit the work to the system workqueue as well.

The AWS IoT does this for e.g. the shadow update work here.

Regards,

Markus