On Sun 22/02/15 10:27, Matti Laakso wrote:
> > From: Sami Olmari [mailto:s...@olmari.fi] 

> > It seems MCN protocol still has some quirks left... it seems that whenever 
> > MCN connection gets disconnected for whatever reason, it can't be > brought 
> > back up... even yanking the dongle out and back in does not do basically 
> > anything... it gets detected etc, but nothing else happends...
> >
> > following logread it shows literally nothing. Like NCM-script isn't there 
> > doing it's magic anymore... "ifup wan"... nothing.. etc.. Only full reboot 
> > makes it to work again, until next ocnnection breakup happends...
> >
> > What should we do?
> >
> > Sami Olmari
> 
> Hi Sami,
> 
> I think that this problem appears when the device is /dev/cdc-wdm* instead of 
> /dev/ttyUSB*. In this case the 3g.usb-script from package comgt doesn't set 
> the interface back to available upon plugging the dongle in (after it has 
> been set unavailable with proto_set_available "$interface" 0). It seems that 
> QMI and MBIM have the same problem. However, the "wwan" package has a 
> suitable wwan.usbmisc-script (but it is missing NCM at the moment). So we 
> should probably just add ncm to wwan.usbmisc and set wwan to be a dependency 
> of comgt-ncm, uqmi and umbim.
> 
> Matti

I'm also seeing this behaviour. Plugging in the dongle after a boot and issuing 
ifup wan does nothing.

In addition, I found that unless the NCM dongle is 'up and ready' before 
(re)booting (ie, has been powered up via a hub and left for a minute or so, 
with the status light progressing from, in my case, flashing green [GPRS] to 
flashing cyan [LTE]) no connection is made. No errors or anything written to 
log.

I experimented with option delay '30' but it made no difference.

This also has an impact on any scripts that need an external interface to be 
up. I need autossh to come up after wwan0 has made a connection, but with the 
current set up it is called well in advance of a connection being made; plays 
havoc with remote setup...

Tristan
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