Quectel EG916Q-GL in ECM mode

[Mark Corbin]

Hello Dan

Many thanks for this. I'll give it a test and let you know how I get on.

Regards

Mark

On Fri, 4 Jul 2025 at 18:18, Dan Williams <dan at ioncontrol.co> wrote:

> On Fri, 2025-07-04 at 11:57 -0500, Dan Williams wrote:
> > Hi,
> >
> > > On Jul 1, 2025, at 10:21 AM, Mark Corbin <mcorbin at lunarenergy.com>
> > > wrote:
> > >
> > > Hello
> > >
> > > I'm trying to configure a Quectel EG916Q for ECM mode so that it
> > > will work under NetworkManager (v1.46.0) as an Ethernet device.
> > >
> > > ModemManager (v1.22.0) reports the following:
> > > >              drivers: option, cdc_ether
> > > >               plugin: quectel
> > > >         primary port: ttyUSB2
> > > >                ports: enu1i4 (net), ttyUSB2 (at), ttyUSB3 (at)
> > >
> > > but I guess that I need the primary port to be 'enu1i4'? Currently
> > > NetworkManager can only see ttyUSB2 as a device (nmcli d).
> > >
> > > The debug output of ModemManager shows:
> > > ModemManager[4247]: <inf> [modem0] net/enu1i4: net (data)
> > > ModemManager[4247]: <dbg> [modem0] net ports available but ignored
> > >
> > > Is there a way to configure this modem so that it will work in ECM
> > > mode?
> >
> > I did
> >
> https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/1277
> >  for the EG915Q and EG915N. The 916Q shares an AT command document
> > with the 915Q so I’d expect it to work with that branch too.
>
> I updated and rebased the MR to the ModemManager 1.24.x branch.
> Hopefully that's easier to test than based off git main (which requires
> very recent libqmi and libmbim).
>
> Dan
>
> >
> > It’s still Draft because I had some issues with the 915Q’s DHCP not
> > consistently handing out IPv4 addresses on bearer activations after
> > the first one; it just wouldn’t reply. CFUN=0 or rebooting the module
> > would make it work again. I also couldn’t get dual-stack working
> > reliably. See
> >
> https://forums.quectel.com/t/eg915q-dual-stack-ecm-only-works-reliably-for-ipv6/40267
> >  for more details.
> >
> > But if you’re able to grab that branch, build, and test it, I’m very
> > curious if it works for you. If you have questions about it, also
> > happy to answer and help you work through it.
> >
> > Dan
> >
> > >
> > > Thanks
> > >
> > > Mark
> > > --
> > >
> > > Mark Corbin
> > > Senior Software Engineer  |  lunarenergy.com  |  LinkedIn  |
> > > Instagram
> > >
> > > C2:Restricted unless otherwise stated.
> > >
> > > Lunar Energy Limited is a company registered in England and Wales,
> > > authorised and regulated by the Financial Conduct Authority under
> > > reference number 767876. Company registration number: 05631091.
> > > Registered office: 55 Baker Street, London, England, W1U 7EU
> >
> >
> >
>
>

-- 

*Mark Corbin *
Senior Software Engineer  |  lunarenergy.com <https://www.lunarenergy.com>
  |  LinkedIn <https://www.linkedin.com/company/lunarenergyinc/>  |
Instagram <https://www.instagram.com/lunarenergyinc/>
[image: Lunar Energy Logo]

-- 
C2:Restricted unless otherwise stated.

-- 








Lunar Energy Limited is a company registered in England and Wales, 
authorised and regulated by the Financial Conduct Authority under reference 
number 767876. Company registration number: 05631091. Registered office: 55 
Baker Street, London, England, W1U 7EU
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