Quectel EG916Q-GL in ECM mode

[Dan Williams]

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.

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 
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> 
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