Novatel 551L + qmi

[Gopakumar Choorakkot Edakkunni]

Hi,

First of all I tried that modem on my Ubuntu 14.04 with the modemmanager
GUI, I ask the GUI to scan for networks and it fails all the time. But
thats ok - my real requirement was to get it running on my openwrt box.
Plugged it in, saw that the option1 driver takes control of ttyUSB[0-3] and
qmi_wwan creates a wwan0 interface. After that running a dhcp client over
wwan0 dint come back with any IP, so reading through the modemmanager code,
I found that we have to send an AT+$NWQMICONNECT over ttyUSB0. I did that
and presto!, wwan0 gets an IP (thanks modemmanager developers !).  A couple
of questions

1. Does anyone know "internally" what is the modem doing on getting an
AT+$NWQMICONNECT ? Does it start a ppp session if the available band is
only 3G ? Once started in 3G and later a 4G-LTE connection is available,
will the modem internally drop the ppp session and switch the IP on 4G-LTE
(and vice versa) ?

2. Other than the AT+$NWQMICONNECT, do we need to send anything else to the
modem to make it work using all available bands based on availability (3G /
4G) or do we have to specify anything to force the modem to work in "these
specific modes" ? I dint find anything like that in the modem manager code,
just thought of asking anyways.

Rgds,
Gopa.
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