Hi!

> > More explanation needed it seems:
> > 
> > I can already do USB with AT commands, no multiplexer needed. We'd
> > actually prefer to go over serial (with multiplexer), because USB
> > needs to be powered down in idle, and you still need communication
> > ovre serial to know that wakeup of USB is needed.
> > 
> > Yes, it is complex :-(.
> 
> I missed the part that the weird serial multiplexer is wired independently. Then do everything via that serial multiplexer and never look back. However if that is as broken, then you will be really out of luck. Making this work reliable will be really hard.
> 
> While we have seen QMI protocol issues as well, but they have been less bad than the bolted on AT commands. Manufactures always get AT commands wrong since they let humans test it and not a real telephony stack like oFono.
> 

Yes, I understand why AT commands are bad. IIRC messages should work
over qmi... but voice calls do not:

user(a)devuan:/my/ofono$ sudo python test/dial-number 604343103
Using modem /gobi_0
Traceback (most recent call last):
  File "test/dial-number", line 40, in <module>
      path = vcm.Dial(number, hide_callerid)
        File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line
	70, in __call__
	    return self._proxy_method(*args, **keywords)
 File "/usr/lib/python2.7/dist-packages/dbus/proxies.py",
 line 145, in __call__
 **keywords)
 File
 "/usr/lib/python2.7/dist-packages/dbus/connection.py",
 line 651, in call_blocking message, timeout) dbus.exceptions.DBusException:
 org.ofono.Error.NotImplemented: Implementation not provided
user(a)devuan:/my/ofono$
			

Communication with modem is definitely happening:

ofonod[7881]: drivers/qmimodem/network-registration.c:event_notify()
ofonod[7881]: drivers/qmimodem/network-registration.c:event_notify()
signal with 80%(-55 dBm) on 5
ofonod[7881]: src/network.c:ofono_netreg_strength_notify() strength 80
ofonod[7881]: drivers/qmimodem/network-registration.c:event_notify()
ofonod[7881]: drivers/qmimodem/network-registration.c:event_notify()
signal with 100%(-54 dBm) on 5

ofono supports voice calls over qmi, right? Is it possible that
mdm6600 does not support them?

qmicli has some voice options, but not option to do a call, either...

user(a)devuan:/my/ofono$ qmicli -d /dev/cdc-wdm0 --voice-get-config
error: couldn't open the QmiDevice: Cannot open device file '/dev/cdc-wdm0': Permission denied
user(a)devuan:/my/ofono$ sudo qmicli -d /dev/cdc-wdm0 --voice-get-config
[/dev/cdc-wdm0] Successfully retrieved Voice configuration:
Current TTY mode: 'off'Current Preferred Voice SO:
	NAM ID: '0'
	EVRC capability: 'enabled'
	Home Page Voice SO: 'evrc'
	Home Origination Voice SO: 'evrc'
	Roaming Origination Voice SO: 'evrc'
AMR Status:
	GSM: 'enabled'
	WCDMA: 'not-supported, gsm-hr-amr' (0x0005)
Current Voice Privacy Preference: 'enhanced'
user(a)devuan:/my/ofono$ sudo qmicli -d /dev/cdc-wdm0 --voice-get-supported-messages
error: couldn't get supported VOICE messages: QMI protocol error (71): 'InvalidQmiCommand'
user(a)devuan:/my/ofono$ 


Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html