Proper documentation for Sierra proprietary AT commands (EM9191, EM7421, ...)?

IoT Modules MC/EM Series
1

The documentation for proprietary AT commands has been lacking for quite some time, and it gets worse for every new HW generation:

  • AT!LTEINFO: essentially undocumented. Some tabular data, but several columns have no obvious meaning, and undocumented coding of values: “Serving:”, columns “D” and “U”? “SCell”, columns “Mdl”, “Mul”? Everything else.
  • AT!NRINFO: essentially undocumented. How are “NR5G ul MIMO:” values coded, dito for DL.
  • AT!RCOMBOS: completely undocumented, only mentioned in FW release notes.
2

Hi @stefanbruens ,
The commands were not mentioned in the official document means they have not completely verified. They might be added in the further.

Thanks

3

!LTEINFO has been there for years now, but still no usable documentation. Are you still “verifying” it?

4

Hi @stefanbruens ,

I know it, I talked about AT!RCOMBOS for one of the commands have not documented. BTW. I collected information that you summarized in the ticket then forwarded to the development team. They’ll review and update for the next release.

Thanks for you idea. It’s very valuable

5

So, finally there was some documentation added, but I wonder if anyone has actually proofread it. From “!NRINFO”

NR5G dl MIMO: NR5G ul MIMO:

Later example shows:
NR5G dl MIMO: 0 NR5G ul MIMO: 1

So, what is “0” supposed to mean? No downlink streams? I doubt it …
How can there uplink MIMO, when UL MIMO is not supported in FR1? (PTS: UL MIMO:· FR1: Not supported)

Tested this with FW 03.04.03.00 and 03.09.00.00. The same nonsense is repeated in !GSTATUS, btw.