nrfUtil Trace LTE Intermittent Issue

RE: nrfUtil Trace LTE Intermittent Issue

Maria Gilje — Thu, 19 Jun 2025 12:09:09 GMT

The likely explanation for the error is that nrfutil trace times out when looking for a UUID in the trace stream. If you send an arbitrary AT command early in the trace, the trace command may have enough time to find the UUID. Let me know if it helps.

Best regards,

Maria

RE: nrfUtil Trace LTE Intermittent Issue

Maria Gilje — Wed, 18 Jun 2025 14:49:59 GMT

Hi Korey,

Thank you for sharing your versions.

I have posted an internal ticket to get some feedback from the relevant team. Thank you for your patience.

Best regards,

Maria

RE: nrfUtil Trace LTE Intermittent Issue

test_user1 — Mon, 16 Jun 2025 16:44:11 GMT

Hi Maria,

I am using nrfutil 8.0.0 (54d8087 2025-01-07) and nrfutil-trace 4.0.1 (4c291c5 2025-04-29).

Thanks!

RE: nrfUtil Trace LTE Intermittent Issue

Maria Gilje — Thu, 12 Jun 2025 12:57:11 GMT

Hi Korey,

Which nrfutil and trace versions do you have installed?

[quote user="test_user1"]I looked at the Cellular Monitor and do not see this automatic setting, but it makes sense this would be the default when selecting Open trace file in Wireshark. [/quote]

In the "trace options" section you can select Autoselect for the modem trace database.

Best regards,

Maria

RE: nrfUtil Trace LTE Intermittent Issue

test_user1 — Tue, 10 Jun 2025 19:48:50 GMT

Hi Maria,

Thank you for the information. I confirmed that the firmware version of the device is mfw_nrf91x1_2.0.2. I tried running this command nrfutil trace lte --input-file test_file.bin --database-config ./trace_db/mfw_nrf91x1_2.0.2_trace-db.json --output-pcapng test_file.pcapng and I get the following error:

00:00:00] ------ 0% [Fixed tracing] No UUID could be found in the provided trace stream
Error: No UUID could be found in the provided trace stream

I looked at the Cellular Monitor and do not see this automatic setting, but it makes sense this would be the default when selecting Open trace file in Wireshark.

Thanks,

Korey

RE: nrfUtil Trace LTE Intermittent Issue

Maria Gilje — Tue, 10 Jun 2025 12:06:26 GMT

Hello,

Thank you for your patience and apologies for the delayed response.

[quote user=""]What triggers the UUID to show up in the log, is there an AT command or something I can use to ensure the UUID is present?[/quote]

The UUID string in the modem trace is used to choose the correct MWF version and subsequently the correct decoder. If you specify a different MFW version than what the UUID string in the modem trace states, the mismatch could cause this error. Could you please verify that you are choosing the correct MFW version?

[quote user=""]In addition, why does the Cellular Monitor not have the same exception? [/quote]

In the Cellular Monitor app there is the option to use the automatic MFW detection feature. If you use this, the correct decoder is chosen automatically.

Best regards,

Maria