Some apps require a restart after switching to/from Wifi/Cellular to reconnect to the network

[Andrew Hayzen]

Some apps require a restart after switching to/from Wifi/Cellular to reconnect to the network

What happened:
1) Ensure wifi is connected
2) Start Dekko
3) Refresh the inbox (notice the bouncing/loading bar stops eventually)
4) Disable wifi so you are on cellular
5) Refresh the inbox (notice the bouncing/loading bar stays continuously)

Note
- if after step 5 you restart the app it is fine
- this only occurs on certain apps, specifically Dekko and Telegram are the ones that i've noticed so far. (Both of which i assume try to have a long running open network connection?)

What I expected to happen:
At step 5) for the connection to automatically change to using Cellular and not require an app restart

$ system-image-cli -i
current build number: 258
device name: mako
channel: ubuntu-touch/rc-proposed/bq-aquaris.en
last update: 2016-03-10 15:48:08
version version: 258
version ubuntu: 20160310
version device: 20160304.2
version custom: 20160201-5-vivid

[Timo Jyrinki (timo-jyrinki)]

I can confirm it but also I can confirm it seems identical on OTA-9. This is useful to know because a month ago we landed a big network related landing consisting of fixes to bug #1470700 bug #1506015 bug #1507769 bug #1528886 etc. So at least it's not a regression.

Looking with the https://bugs.launchpad.net/savilerow/+bug/1357321/comments/99 tool, it seems to continue working with HTTP GET when there's a configuration change (and the configuration change seems to happen correctly with a 0.5s of Network session error when switching).

[Lorn Potter (lorn-potter)]

It could very well be these apps are doing something that is causing this behaviour.
I am not convinced this is an issue with QNAM.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[zubozrout (zubozrout)]

Hi,
yeah, this is a really an old issue. Nevertheless there are other problems involved here - one thing is the app being unable to work after some change in the connection but the other is the whole OS freezing and reinitializing itself after about 10 to 60 seconds (not rebooting but starting directly from the Ubuntu dotted loading screen).

I experience behaviour quite often to be honest, like 1 of 10 times I am using my phone in a subway when my connection fluctuates from none any (I've also seen this when my phone switched from cellular to wireless and the vice versa). I am not sure what happens when my phone is in my pocket untouched though. Sadly those spontaneous "almost-restarts" kill all my applications and any stuff I may be working on there.

This happens for me on MX4 and I am not exactly sure when I saw it the first time but it wasn't that long ago ... maybe something like April/May 2016? (just a guess)

The system freeze bug I am experiencing may not be related to this though, I am not sure. When Telegram ceases working for me I am usually still able to kill it and start again, sometimes even send a message, before the whole system stops responding. Then it takes up to two minutes for it to realize it is stuck before it reinitializes itself.