MC7430 Connection problem

[Erik Kazandjian]

Hi,

I'm trying to integrate a Sierra Wireless AirPrime MC 7430 with a 
raspberry pi.

On the pi I run the fillowing kernel (uname -a)

Linux raspberrypi 4.9.52-v7+ #1038 SMP Fri Sep 29 16:26:52 BST 2017 
armv7l GNU/Linux

I have the latest version of libqmi compiled 1.17.0

My modem is recognized by the system as shown in the output of dmesg

[  585.668119] usb 1-1.4: new high-speed USB device number 5 using dwc_otg
[  585.799104] usb 1-1.4: config 1 has an invalid interface number: 8 
but max is 4
[  585.799121] usb 1-1.4: config 1 has an invalid interface number: 10 
but max is 4
[  585.799134] usb 1-1.4: config 1 has no interface number 1
[  585.799144] usb 1-1.4: config 1 has no interface number 4
[  585.799940] usb 1-1.4: New USB device found, idVendor=1199, 
idProduct=9071
[  585.799954] usb 1-1.4: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[  585.799966] usb 1-1.4: Product: Sierra Wireless MC7430 Qualcomm® 
Snapdragon™ X7 LTE-A
[  585.799976] usb 1-1.4: Manufacturer: Sierra Wireless, Incorporated
[  585.799986] usb 1-1.4: SerialNumber: LU60950414011010
[  585.802278] qcserial 1-1.4:1.0: Qualcomm USB modem converter detected
[  585.803098] usb 1-1.4: Qualcomm USB modem converter now attached to 
ttyUSB0
[  585.804394] qcserial 1-1.4:1.2: Qualcomm USB modem converter detected
[  585.804983] usb 1-1.4: Qualcomm USB modem converter now attached to 
ttyUSB1
[  585.806031] qcserial 1-1.4:1.3: Qualcomm USB modem converter detected
[  585.806573] usb 1-1.4: Qualcomm USB modem converter now attached to 
ttyUSB2
[  585.808010] qmi_wwan 1-1.4:1.8: cdc-wdm0: USB WDM device
[  585.810069] qmi_wwan 1-1.4:1.8 wwan0: register 'qmi_wwan' at 
usb-3f980000.usb-1.4, WWAN/QMI device, 3a:0b:18:73:f4:e1
[  585.812268] qmi_wwan 1-1.4:1.10: cdc-wdm1: USB WDM device
[  585.813950] qmi_wwan 1-1.4:1.10 wwan1: register 'qmi_wwan' at 
usb-3f980000.usb-1.4, WWAN/QMI device, 3a:0b:18:73:f4:e1


However when I try to connect with the modem to the LTE network it looks 
as if the modem is successfully attached to the cell but I don't get an 
IP address on any of my interfaces wwan0 or wwan1.

When i run the qmi-network tool I get the following output

sudo qmi-network /dev/cdc-wdm0 start
Loading profile at /etc/qmi-network.conf...
     APN: internet
     APN user: unset
     APN password: unset
     qmi-proxy: no
Checking data format with 'qmicli -d /dev/cdc-wdm0 --wda-get-data-format 
'...
Device link layer protocol retrieved: raw-ip
Getting expected data format with 'qmicli -d /dev/cdc-wdm0 
--get-expected-data-format'...
Expected link layer protocol retrieved: 802-3
Updating kernel link layer protocol with 'qmicli -d /dev/cdc-wdm0 
--set-expected-data-format=raw-ip'...
error: cannot set expected data format: Expected data format not updated 
properly to 'raw-ip': got '802-3' instead
Error updating kernel link layer protocol
Starting network with 'qmicli -d /dev/cdc-wdm0 
--wds-start-network=apn='internet'  --client-no-release-cid '...
Saving state at /tmp/qmi-network-state-cdc-wdm0... (CID: 35)
Saving state at /tmp/qmi-network-state-cdc-wdm0... (PDH: 63159616)
Network started successfully

If I then try to obtain an ip address I get nothing

sudo dhclient -v wwan0
Internet Systems Consortium DHCP Client 4.3.1
Copyright 2004-2014 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/wwan0/3a:0b:18:73:f4:e1
Sending on   LPF/wwan0/3a:0b:18:73:f4:e1
Sending on   Socket/fallback
DHCPDISCOVER on wwan0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on wwan0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on wwan0 to 255.255.255.255 port 67 interval 15
DHCPDISCOVER on wwan0 to 255.255.255.255 port 67 interval 14
DHCPDISCOVER on wwan0 to 255.255.255.255 port 67 interval 16
No DHCPOFFERS received.
No working leases in persistent database - sleeping.


Any ideas what might be the issue ?

Thanks

Erik