SCAT with NB-IOT signalling messages support

[yachen0409]

Hi.
I want to ask if SCAT can capture NB-IOT signalling messages or not.
I'm trying to collect NB-IOT traces on Pixel 9, however, I can only get the part after PDN establishment request. The parts of MIB/SIB and RACH (RRC) are missing.
If SCAT does not support NB-IOT, then is it possible? If it is possible, I would happy to study on this topic and contribute to the project.

Thank you.

[peremen]

Currently SCAT only supports NB-IoT on Qualcomm devices. Please send me a .sdmraw file generated using --all-items --sdmraw file_to_dump.sdmraw options for further investigation.

[yachen0409]

Hi,
This URL linked the .sdmraw file from my Pixel9.
This is the first time I collect sdmraw file with SCAT. Please let me know if I did it wrong.

Thank you.

[yachen0409]

Hi @peremen , can you access to the .sdmraw file I collected?

[peremen]

I was really busy latest days, will look it later on.

[peremen]

I analyzed the .sdmraw file, but at least it seems that 0x52 (parse_sdm_lte_rrc_message) does not show any unknown channel. As far as I know, NB-IoT shares the same NAS with normal LTE, but their RRC is different. Therefore, I'd expect NAS messages without any RRC message containing them when it could be linked to NB-IoT RRC message, but all NAS messages have RRC messages which contains them. Also, the ARFCN shows Band 30, which does not typically belong to any NTN network.

In addition, did you included --all-items switch while running SCAT? When that switch is specified, then the Item Select Response for ... should contain much more items, but it seems that only default set of items are enabled in your log.