Bug 90124

Summary:	Get signal quality of Sierra Wireless Modem
Product:	ModemManager	Reporter:	Pieter Cardoen <p.cardoen>
Component:	general	Assignee:	ModemManager bug user <modemmanager>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	1.4
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Pieter Cardoen 2015-04-21 10:08:10 UTC

Dear

I'am trying to get a signal quality parameter from my Sierra Wireless MC7304 Modem. I can't find anything in the D-Bus interface (introspection done by D-Feet).

According to http://www.freedesktop.org/software/ModemManager/api/1.4.0/
there should be a org.freedesktop.ModemManager1.Modem.Signal interface but I don't have that interface. What could be the reason that I can't see that D-Bus interface?

I've tried to get signal quality via AT+CSQ which is possible if ModemManager is disabled. However if I try to send AT commands to the Modem via the D-Bus Command, I get 'No AT port available to run command (36)'. I've started ModemManager and NetworkManager with --debug.

FYI: Operating system is Debian Jessie testing

What could I do to get a signal quality measure?

Comment 1 Aleksander Morgado 2015-04-21 13:06:48 UTC

You should be able to see signal quality parameters just from the "Modem" generic interface, see:

http://www.freedesktop.org/software/ModemManager/api/1.4.0/gdbus-org.freedesktop.ModemManager1.Modem.html#gdbus-property-org-freedesktop-ModemManager1-Modem.SignalQuality

The "Signal" interface is a special one, currently only implemented for QMI modems.

But your MC7304 is indeed a QMI modem, you can skip using AT commands for that. What kernel version are you using? Do you have the qmi_wwan driver installed?

Comment 2 Pieter Cardoen 2015-04-21 13:20:43 UTC

Dear

Thanks for the reply.

I've indeed seen that there is a SignalQuality parameter which can be used but it only replies with '0L'. I've never got useful data :(.

My Kernel version is 3.16.0-4-586

The Sierra Wireless FAE mentioned us to install GobiNet and GobiSerial drivers for the MC7304 wireless card. Should I try with the qmi_wwan driver? 

Thanks!

Comment 3 Aleksander Morgado 2015-04-21 16:34:24 UTC

(In reply to Pieter Cardoen from comment #2)
> Dear
> 
> Thanks for the reply.
> 
> I've indeed seen that there is a SignalQuality parameter which can be used
> but it only replies with '0L'. I've never got useful data :(.
> 
> My Kernel version is 3.16.0-4-586
> 
> The Sierra Wireless FAE mentioned us to install GobiNet and GobiSerial
> drivers for the MC7304 wireless card. Should I try with the qmi_wwan driver? 
> 

If you want to use ModemManager with libqmi, then you *must not* use GobiNet and GobiSerial; you must use the qmi_wwan driver instead (i.e. don't install any other driver than the one you got in your kernel). See:
https://sigquit.wordpress.com/2014/06/11/qmiwwan-or-gobinet/

Comment 4 Pieter Cardoen 2015-04-23 11:15:12 UTC

Thanks for the reply Aleksander

I've tried it yesterday, with succes.  I am very happy that it is possible to use mainstream drivers for this hardware platform. We will integrate it in this way and reduce risk in the field!

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