[yocto] Poky/Yocto drivers for cellular modem

[Maciej Borzecki]

On Thursday 18 of September 2014 16:39:33 Simon Andrieu wrote:
> Hi,
> 
> I work for a company  that develops telemetry boxes, and that uses a
> Poky/Yocto distribution running on the main board. It is planned to
> integrate a cellular module connected via USB or serial link to the main
> board.
> 
> Using some Linux distribution, it exists drivers that help recognizing a
> cellular modem USB stick and to raise a corresponding network interface.
> Would you know please if such a generic cellular modem driver exists in
> Poky/Yocto distribution please? More further, It could be helpful to have
> some tutorial notes to integrate it please.

I'm working a similar applications. Most USB devices seem to implement CDC ACM 
that works quite well with kernel drivers. Basically you end up with one of 
/dev/ttyACM devices that pppd can talk to. 

In past, due to image size constraints, we had custom code that looked at 
these devices (used libudev to correlated /dev entries with usb devices) and 
started pppd, thus skipping ofono/connman and their deps. The current setups 
are mostly systemd/systemd-networkd + pppd glue. Without much trouble it's 
possible to get ~20MB ext3 rootfs image with all the stuff you need.

There were also some dongles that came up as CDC Ether, but I've only seen 
this for some WiMAX modules that I'm not sure are even available on the market 
anymore.

For transport, you can find rabbitmq-c in meta-oe. I'll also be sending some 
patches for Paho MQTT libraries and mosquitto next week or so.

-- 

Maciej Borzęcki 
Senior Software Engineer Open-RnD Sp. z o.o. 
www.open-rnd.pl, Facebook, Twitter 
mobile: +48 telefon, fax: +48 42 657 9079 

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