RE: Issue Activating TAU Timer on nRF9151-DK with PSM Enabled

Hakon — Fri, 28 Nov 2025 11:40:49 GMT

[quote user="m_s"]I would appreciate guidance on whether there is an alternative approach to obtaining modem traces or if there are additional configurations I may have overlooked.[/quote]

You can look at this https://docs.nordicsemi.com/bundle/ncs-latest/page/nrfxlib/nrf_modem/doc/modem_trace.html .

Also, modem trace can be enabled using snippets.

RE: Issue Activating TAU Timer on nRF9151-DK with PSM Enabled

m_s — Thu, 27 Nov 2025 15:02:36 GMT

Hello Hakan,

The SIM card currently in use is specifically designed for M2M solutions and has been verified to work properly on other devices from different manufacturers using the same APN.

Regarding another topic, I have questions about how to obtain modem traces. My assumption is that this is typically done through the Cellular Monitor application. However, when connecting the device, the interface fails to interpret the modem responses, resulting in all fields being displayed as “Unknown.”

Attempts to capture traces under these conditions have produced files with a size of 0.

Configuration changes were also applied in Kconfig to enable trace functionality:

The last two lines remain commented out because enabling them causes the build process to fail.

The only method I have found to successfully obtain traces is by using the pre-installed firmware that is deployed when selecting the AT commands option in the Quick Start menu. Unfortunately, this firmware does not include the PSM-related configurations mentioned earlier in the discussion.

I would appreciate guidance on whether there is an alternative approach to obtaining modem traces or if there are additional configurations I may have overlooked.

Thank you in advance for your support.

RE: Issue Activating TAU Timer on nRF9151-DK with PSM Enabled

Hakon — Thu, 27 Nov 2025 12:32:10 GMT

Hello,

what type of SIM are you using? Perhaps this could be a network side issue. You should provide modem trace.