Cdtjkyj

O/S: Raspberry Pi running Raspbian GNU/Linux 8 (jessie)

Kernel: Linux 4.9.24-v7+

Ran ip addr and confirmed wwan0 and wwan1 interfaces are created.

wwan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000

link/ether ce:d3:4d:fc:a7:9b brd ff:ff:ff:ff:ff:ff

inet 169.254.160.49/16 brd 169.254.255.255 scope global wwan0

    valid_lft forever preferred_lft forever



wwan1: .....

Successfully started

qmi-network /dev/cdc-wdm0 start

Ran

qmicli -d /dev/cdc-wdm0 --wda-get-data-format

and got result

                        QoS flow header: no

                    Link layer protocol: 'raw-ip'

       Uplink data aggregation protocol: 'disabled'

     Downlink data aggregation protocol: 'disabled'

                          NDP signature: '0'

Downlink data aggregation max datagrams: '0'

     Downlink data aggregation max size: '0'

Ran

qmicli -d /dev/cdc-wdm0 --nas-get-signal-strength

and got result

Current:

     Network 'umts': '-103 dBm'

RSSI:

     Network 'umts': '-103 dBm'

ECIO:

     Network 'umts': -10.0 dBm'

IO: '-106 dBm'

SINR: (8) '9.0 dB'

Ran

dhclient -v wwan0

and got result

Internet Systems Consortium DHCP Client 4.3.1

...



Listening on LPF/wwan0/ce:d3:4d:fc:a7:9b

Sending on   LPF/wwan0/ce:d3:4d:fc:a7:9b

Sending on   Socket/fallback

DHCPDISCOVER on wwan0 to 255.255.255.255 port 67 interval 4

DHCPDISCOVER on wwan0 to 255.255.255.255 port 67 interval 8

....

....

I tried a lot of times and still cannot get the IP address.

Any help is appreciated.

Edited:

Also, I have tried to change the link layer protocol to 802-3

qmicli -d /dev/cdc-wdm0 --wda-set-data-format=802-3

The message said 'Successfully set data format', but the link layer protocol still is 'raw-ip'.

Couldn't the problem be with the server? Did you try other devices/PCs to make sure they are getting an IP or not? The problem could possibly be with the DHCP server for some reason.
Make also sure you are not using a static IP configured on the interface. (I can see you are getting an APIPA address but what is the config in the wwan0.conf for example?

Thanks all for your help.

I found out that the EM7430 does not support 802-3 and is raw ip only. It does not work with dhclient nor dhcpcd.

dhclient and dhcpcd don't seem to have support for raw-ip. I did however manage to get an IP with udhcpc. It's not available on all Linux distros though, so you're limited to Debian based distros.