inspector mode doesn’t work when connected to mobile network

[Olivier Tilloy]

I can remotely inspect a web page on my arale or frieza devices, from my laptop on the same local network (launching webbrowser-app with the "--inspector" switch, which by default listens on port 9221). However the same doesn’t work on my krillin:

osomon@bribon:~$ nmap 192.168.1.79 -p 9221

Starting Nmap 7.01 ( https://nmap.org ) at 2016-05-18 12:05 CEST
Nmap scan report for 192.168.1.79
Host is up (0.080s latency).
PORT STATE SERVICE
9221/tcp closed unknown

Nmap done: 1 IP address (1 host up) scanned in 0.16 seconds

All devices tested are running the latest rc-proposed image. I’m not seeing any significant difference in the app’s log between devices.

[Olivier Tilloy (osomon)]

On krillin, the code that sets the IP address for devtools incorrectly gets the address of the ccmni0 device, instead of that of wlan0. So it’s listening on e.g. 10.226.61.16:9221 instead of 192.168.1.79:9221, which explains the issue.

[Olivier Tilloy (osomon)]

The faulty code is in BrowserApplication::inspectorHost() (https://bazaar.launchpad.net/~phablet-team/webbrowser-app/trunk/view/head:/src/app/browserapplication.cpp#L86).

[Olivier Tilloy (osomon)]

And the same code works on arale because arale only lists lo and wlan0 as network devices.

[Olivier Tilloy (osomon)]

And unsurprisingly if I switch on airplane mode (to disable mobile data) and then switch on wifi, inspector mode works. So this is not device-specific.

[Olivier Tilloy (osomon)]

(it just happened to work ootb with my arale and frieza because I didn’t put any SIM card in them)