AT commands to a Sierra Wireless EM9291

[groupo]

After a little more digging, I suppose this is the same line of questioning here... which looks unanswered

Re: Serial communication with Sierra Wireless EM9291

[groupo]

Looked thru the repo as suggested here

@Eric-Katzfey said in Serial communication with Sierra Wireless EM9291:

There are some scripts in our voxl-modem repo that use AT commands. https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-modem/-/tree/master/scripts?ref_type=heads

it looks like all examples of AT commands there are done by echoing to ttyUSB2 which, as I understand the scripts, is only applicable to a v2 modem, not the em9291. Am i overlooking something?

[groupo]

@groupo @tom @Eric-Katzfey @Alex-Kushleyev any traction on this? I am in a holding pattern with my project until i can establish how to send these AT commands. I have another post up on Sierra Wireless forums who want me to install MBPL USB driver but would like to talk to yall before I move forward with that

[Alex Kushleyev]

@groupo , sorry, this is not my area of expertise, hopefully Tom and Eric can help!

Alex

[groupo]

@Alex-Kushleyev Thank you, I figured... but I saw you were online and wanted to poke the devs

[tom]

@groupo I haven't been able to send AT commands to that flavor of Sierra modem, I've done everything via. qmicli at this point.

There's a good chance that driver would enable it but I haven't dug any deeper into it at this point.

[groupo]

@tom thanks for getting back to me. My hesitation with installing it was messing up something you guys have put into place and having to reflash. Can you think of any easy gotchas before I go through with it?

[tom]

@groupo Nah doesn't sound like anything too sketchy. It's easy to re-flash the SDK if you do mess anything up and I can help you through that if you get stuck.

[groupo]

@tom Might you be able to help with the install? I have the drivers but I am a not very savvy with any software that isnt MATLAB.

the readme is very straightforward, but I am running into issues:

1. run 'make' to install driver binaries
2. run 'make install' and reboot to install them

The makefile script looks for /lib/modules($shell uname -r)/build... which does not exist. I can mkdir it but I still get make errors. I am not even sure where I should place the folder 'usb' that these drivers are in.

I can provide the actual make script and anything else you'd wanna see... just want to see if youre able to help before dumping it all haha

[tom]

@groupo Try this before building:

sudo ln -s /usr/src/header /lib/modules/$(uname -r)/build

[groupo]

@tom

Done but still get errors

voxl2:/$ sudo ln -s /usr/src/header/ /lib/modules/$(uname -r)/build 
voxl2:/$ cd usb
voxl2:/usb$ make
make -C /lib/modules/4.19.125/build M=/usb
make[1]: Entering directory '/lib/modules/4.19.125/build'
make[1]: *** No targets specified and no makefile found.  Stop.
make[1]: Leaving directory '/lib/modules/4.19.125/build'
Makefile:12: recipe for target 'all' failed

[groupo]

@tom I see this is running libqmi 1.22.0. The latest, 1.32.0, has a command for AT commands. Have you tried this new version internally? Could I upgrade mine?

[tom]

@groupo Ooh cool, we haven't tried that before. Looks like you should be able to try upgrading it via. apt. Feel free to try that and let me know if you have luck!

[groupo]

@tom just apt update libqmi ? Again sorry, but I am not very familiar with linux.

Another thing, I may have deleted the contents of /usr/src/header while trying to delete that symbolic link you had me make earlier. I swore there was stuff in /header, but I dont see anything in there now. I ran rm -r /lib/modules/###/build which I thought should not touch anything past the link itself. If there is supposed to be stuff in there, can I get it back without reflashing?

[tom]

@groupo I don't know of a way to get those files back without reflashing.

I just checked and it doesn't seem like there's a newer version available via. apt with the repos currently on there.

You may have to build and install it via. source

[groupo]

@tom I was just typing a msg up to relay apt isnt showing any of them available for updating. I will try to reflash.

I need to be able to connect to a private LTE network (MCC-MNC 001-01) which, as far as I have read, the EM9291 does not natively search for. I've read you can issue AT commands to tweak how the modem operates but am at a standstill trying to either install drivers to enumerate ttyUSB0 or update qmicli to the newest version so that I can issue AT commands that way. I think reflashing is necessary to get those files back and reestablish some ground truth with my drone. I should be able to go through those directions on my own. After that, are you able to assist me with either of the two avenues I discussed? I am grossly unfamiliar with the platform's architecture, but if I could get you on even a short call I think it would greatly accelerate this process for the two of us.

[tom]

@groupo I can't provide a ton of help as I haven't tried it myself but you should be able to build and install a newer version of libqmi by following the instructions from here:

Building libqmi 1.30 or earlier using GNU autotools

How to build and install the libqmi library using GNU autotools.

(modemmanager.org)

In terms of which AT commands are required to send I can't really help there, it may require reading through Sierra's AT command docs

[groupo]

@tom I am talking to a dev from Sierra Wireless who can help with the AT commands. there are some very useful forum posts there for connecting to 'test' LTE networks. I just need to send the AT commands to do so. I need your assistance in either installing that driver to enumerate the port or updating qmi. I will try to update qmi first, as that seems like the simpler approach. I need libqmi 1.34 which switched from GNU autotools to Meson. That means nothing to me, I will just follow the steps, more FYI

[groupo]

@tom need Meson to get newest libqmi. Tried installing that but ran into more errors, I hate feeling like I am asking to be spoonfed but I really could use some guided direction here - I am extremely out of my element

[tom]

@groupo You can install meson and ninja with

sudo apt install meson ninja-build