Android IRC clients get disconnected silently #554
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adam (Adam Wojcieszonek)
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Reference: adam/znc#554
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When connecting to znc from an android client(Andchat/Holoirc), after 8-10 minutes of the phone being locked I notice that I can't receive or send any messages, but the client shows that I'm still connected to znc.
I once check the list of connected clients(listclients and listsockets) from my desktop when this happened and only the desktop client appeared connected.
Note that before I started using znc I used the RizonBNC that disconnected me every 20-30 minutes while I was using IRC from android, difference was that the client was aware that the connection was closed.
--- Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/25854893-android-irc-clients-get-disconnected-silently?utm_campaign=plugin&utm_content=tracker%2F1759&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F1759&utm_medium=issues&utm_source=github).Phone being locked makes it sound like client issue. Does your phone happen to disable network connections when the screen is locked?
Also which version of ZNC are you using,
/msg *status version?@Mikaela ZNC 1.2
I have wifi always on during sleep and wifi optimization on. Turning wifi optimization off didn't resolve the problem.
@bno1 you should upgrade to 1.6.1 and see if this happens with it. 1.2 is 2 years old and had security issue which is why 1.4 was released. 1.4 again isn't validating SSL certificates and is affected by POODLE, FREAK etc.
@Mikaela I updated and the issue persists
Then it`s something with your device / irc client.
"znc -D" can help you to see what's going on and why/how client disconnects.
2015-08-18 11:57 GMT+01:00 Edža notifications@github.com:
I did 2 tests with the debug option:
While the phone was locked on smart power saving profile(the default I use)
While the phone was charging and unlocked through the whole test on normal power saving profile
The client is AndChat 1.4.3.2
Result: after locking the phone the client doesn't send nor respond to pings. The client doesn't detect the closed connection.
Result: the client sends only one ping to znc then never responds. After znc disconnects the client it immediately reconnects, as it is configured to.
I will do some more testing with other, more recent irc clients and test direct connections to the network too. I highly doubt it's znc's fault here.
I think "smart power saving" is your problem. Try to turn it off for one test.
@urbels Yes, it can cause the connection to timeout. After testing some more clients I noticed that most of them don't reply do znc's pings whether or not the phone is locked. AndroIRC performs well when ping is enabled from the settings menu.
I tested shroudBNC and it works as expected. The only difference I noticed between the two is the client ping frequency. sbnc pings the client every 90 seconds, while znc pings it every 270 seconds. I set sbnc's ping frequency to 360s and it exhibits the same problem as znc. I'll try to recompile znc with 60s ping frequency and see how it behaves.
Yes, its working. 20 minutes locked with power saving features on and it's still connected.
So summary of the problem.
I think that the phone, after a few minutes of cpu inactivity, goes into a deep sleep mode and fails to reply to znc's pings. For some reason this leads to the connection breaking(the client thinks it's still connected but can't send or receive anything). Increasing znc's ping frequency from one ping per 4.5 minutes to one ping per minute stops my phone from going into deep sleep and losing connection. I still blame my cheap phone running an old android version for this issue.
I said earlier that most android IRC clients fail to reply to pings properly, except AndroIRC. This is false, they all reply properly, it's just that AndroIRC specifically sends pings to the server every 10-30 seconds, keeping the phone off deep sleep for longer, but even so it loses connection at some point.
As a suggestion make PING_FREQUENCY, PING_SLACK and NO_TRAFFIC_TIMEOUT in class CIRCNetwork configurable in znc.conf.
#979 decreased that timeout to 2m.
Actually https://github.com/znc/znc/issues/980 lowered it and https://github.com/znc/znc/issues/979 is request to make it configurable.
Isn't this basically duplicate of https://github.com/znc/znc/issues/979?