[FS#1304] DDNS does not function with QMI protocol and IP does not appear in LuCI

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Evren Yurtesen (yurtesen) 

Attached to Project - OpenWrt/LEDE Project
Summary - DDNS does not function with QMI protocol and IP does not appear in LuCI
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I am using OpenWrt SNAPSHOT, r5934-059b2f5 with an ec-25e card using QMI.

Device gets an IP properly.

Thu Jan 25 18:26:27 2018 daemon.notice netifd: Interface 'wwan' is now down
Thu Jan 25 18:26:28 2018 daemon.notice netifd: Interface 'wwan' is setting up now
Thu Jan 25 18:26:28 2018 daemon.notice netifd: wwan (16229): Device does not support 802.3 mode. Informing driver of raw-ip only for wwan0 ..
Thu Jan 25 18:26:28 2018 daemon.notice netifd: wwan (16229): Waiting for network registration
Thu Jan 25 18:26:28 2018 daemon.notice netifd: wwan (16229): Starting network wwan
Thu Jan 25 18:26:28 2018 daemon.notice netifd: wwan (16229): Setting up wwan0
Thu Jan 25 18:26:28 2018 daemon.notice netifd: Interface 'wwan' is now up
Thu Jan 25 18:26:28 2018 daemon.notice netifd: Network device 'wwan0' link is up
Thu Jan 25 18:26:28 2018 daemon.notice netifd: Network alias 'wwan0' link is up
Thu Jan 25 18:26:28 2018 daemon.notice netifd: Interface 'wwan_4' is enabled
Thu Jan 25 18:26:28 2018 daemon.notice netifd: Interface 'wwan_4' has link connectivity
Thu Jan 25 18:26:28 2018 daemon.notice netifd: Interface 'wwan_4' is setting up now
Thu Jan 25 18:26:28 2018 daemon.notice netifd: wwan_4 (16355): udhcpc: started, v1.27.2
Thu Jan 25 18:26:28 2018 daemon.notice netifd: wwan_4 (16355): udhcpc: sending discover
Thu Jan 25 18:26:28 2018 daemon.notice netifd: wwan_4 (16355): udhcpc: sending select for 10.36.238.224
Thu Jan 25 18:26:29 2018 daemon.notice netifd: wwan_4 (16355): udhcpc: lease of 10.36.238.224 obtained, lease time 7200
Thu Jan 25 18:26:29 2018 daemon.notice netifd: Interface 'wwan_4' is now up

However in LuCI the IP address is not shown in the interfaces section, at `wwan` interface.

Also DDNS scripts fail with error

182633 ERROR : Can not detect local IP using network_get_ipaddr 'wwan' - Error: '1' - TERMINATE

I believe the issue is because the interface name which gets the IP is `wwan_4` instead of `wwan` but I am not able to set this interface in DDNS setup from LuCI and also well LuCI does not show the `wwan` IP address. I am not sure what would be the fix but this clearly is a problem and may effect other things as well.

Thanks!

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1304