Re: [SailfishDevel] Qt Network: "Network access is disabled" after network change

[Tone Kastlunger]

Okay;
there has been a rewrite for bearer plugin, has that helped in any way?

On Wed, May 3, 2017 at 2:46 AM, Lorn Potter  wrote:

>
>
> On 01/05/17 19:16, Slava Monich wrote:
> > Basically, QNetworkAccessManager is sometimes stuck in NotAccessible
> > state after switching from mobile data to wifi.
>
> > My theory was that
> > configurationChanged, onlineStateChanged and networkSessionStateChanged
> > (queued) signals from the past were getting mixed with the current state
> > (which was checked directly) in such a way that
> > QNetworkAccessManagerPrivate online state remained false even though
> > connman service was getting successfully connected.
>
> This is all from memory, but...
>
> The cell network 'disconnected' can come in after wifi has been
> established, but before all wifi settings are available so QNAM
> configuration cannot be 'active'. connman manager can send a 'services
> updated' signal before the service object has actually been updated
> internally. so the bearer plugin goes to check it and the properties of
> that service are not yet updated.
>
> and then, wpa/connman can also 'remove' an AP when it really is around,
> even in the middle of connecting.
>
> As well, connman's 'ready' and 'online' are both equivalent to
> QNAMConfiguration::Active. 'ready' does not guarantee that internet can
> be reached, and 'online' check can easily fail.
>
>
> I am sure there are other intricacies I am forgetting, but the
> interactions are quite complicated, so it's not an easy bug to fix.
> Even if you remove the whole 'manually setting NetworkAccessible' to
> notAccessible.
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Re: [SailfishDevel] Qt Network: "Network access is disabled" after network change

[Lorn Potter]

On 01/05/17 19:16, Slava Monich wrote:
> Basically, QNetworkAccessManager is sometimes stuck in NotAccessible
> state after switching from mobile data to wifi.

> My theory was that
> configurationChanged, onlineStateChanged and networkSessionStateChanged
> (queued) signals from the past were getting mixed with the current state
> (which was checked directly) in such a way that
> QNetworkAccessManagerPrivate online state remained false even though
> connman service was getting successfully connected.

This is all from memory, but...

The cell network 'disconnected' can come in after wifi has been
established, but before all wifi settings are available so QNAM
configuration cannot be 'active'. connman manager can send a 'services
updated' signal before the service object has actually been updated
internally. so the bearer plugin goes to check it and the properties of
that service are not yet updated.

and then, wpa/connman can also 'remove' an AP when it really is around,
even in the middle of connecting.

As well, connman's 'ready' and 'online' are both equivalent to
QNAMConfiguration::Active. 'ready' does not guarantee that internet can
be reached, and 'online' check can easily fail.


I am sure there are other intricacies I am forgetting, but the
interactions are quite complicated, so it's not an easy bug to fix.
Even if you remove the whole 'manually setting NetworkAccessible' to
notAccessible.
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Re: [SailfishDevel] Qt Network: "Network access is disabled" after network change

[Lorn Potter]

On Monday, May 1, 2017 7:16:34 PM AEST Slava Monich wrote:
> but that didn't quite fix it. It does eliminate one scenario (described in
> the merge request) but there must be something else there. The whole
> connman bearer plugin thing looks generally prone to race conditions, I
> would've done it differently but we have what we have.

I don't think 'race' is the right term for what is happening.

The whole networkAccessible thing was for Symbian, so the network could 
manually be put into a not accessable mode, when the network was actually 
still accesible. It was never really intended to be "am I online" check for 
developers/apps. Symbian had network access per app. Other platforms do not 
have this concept, it's the system that has network access.

The 'race' issue is really just that connman is async and QNAM basically 
expects low level to be synchronous and that settings are always instantly 
available when the QNAM object is contructed. connman doesn't work like that. 
and sometimes, connman and wpa_supplicant are just plain buggy as well. As 
well, connman has a concept of 'network working' and 'internet is working', 
both of which are buggy.

So things are happening in an unexpected order sometimes. To top it off, all 
these settings go through dbus. so all the wireless AP's that are nearby go 
though this and need to be handled in some way. So the dbus is getting pounded 
at times.
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Re: [SailfishDevel] Qt Network: "Network access is disabled" after network change

[Slava Monich]

Here, I copied the most interesting parts from the bug:

Basically, QNetworkAccessManager is sometimes stuck in NotAccessible 
state after switching from mobile data to wifi.


Among other things, it makes QNetworkAccessManager::get () to fail with 
QDisabledNetworkReply which breaks XmlListModel as some people have noted.


Qt 5.2 had a similar problem but this helped:

https://git.merproject.org/mer-core/qtbase/merge_requests/3

Unfortunately, Qt connman bearer plugin has significantly changed in Qt 
5.6 and this trick stopped working.


When the switch (between mobile and wifi) is happening, the action 
occurs in parallel on two threads, Qt bearer thread and the main thread, 
the signals are queued, although the main thread is fetching the current 
state directly from the objects being manipulated by the bearer thread. 
My theory was that configurationChanged, onlineStateChanged and 
networkSessionStateChanged (queued) signals from the past were getting 
mixed with the current state (which was checked directly) in such a way 
that QNetworkAccessManagerPrivate online state remained false even 
though connman service was getting successfully connected. So I came up 
with this:


https://git.merproject.org/mer-core/qtbase/merge_requests/18

but that didn't quite fix it. It does eliminate one scenario (described 
in the merge request) but there must be something else there. The whole 
connman bearer plugin thing looks generally prone to race conditions, I 
would've done it differently but we have what we have.


Cheers,
-Slava



Thanks for the quick reply;
I was actually hoping to collect some more background intel on this issue.


On Sun, Apr 30, 2017 at 10:56 PM, Slava Monich > wrote:


Unfortunately, no, it's an internal bug. If you would like to be
notified via email about a potential fix, you could watch qtbase
pull requests - those are quite rare, it shouldn't be too much of
a spam.

Cheers,
-Slava




Hi Slava;
is there a MER bug for this?

tortoisedoc

On Sun, Apr 23, 2017 at 11:33 AM, Slava Monich
mailto:slava.mon...@jolla.com>> wrote:

Network status detection in Qt 5.6 is unreliable when the
system is switching between wifi and mobile data. That
results in QNetworkAccessManager sometimes thinking that
network access is disabled when in fact the device is online.
At some point I attempted to fix it
(https://git.merproject.org/mer-core/qtbase/commit/8122f32a
)
however that only eliminated one particular scenario of
failure and reduced the probability. But it's still
happening. As I understood it's a random thing (race
condition) triggered by two connman services changing their
status more or less simultaneously.

Jolla's Weather app also uses XmlListModel and suffers from
the same issue.

Nobody at Jolla is actively working on it at the moment, our
resources are limited these days. If somebody has an idea how
to fix it, feel free to submit a pull request against mer-5.6
branch
(https://git.merproject.org/mer-core/qtbase/commits/mer-5.6
).

Best regards,
-Slava


Hi,

The same happens in my Rush hour app available in
OpenRepos. My only connection to network is via
QtQuick.XmlListModel 2.0. I am using Jolla C and the
latest Iijoki 2.1.0.11

https://github.com/Rikujolla/trafficviewer/issues/2


Best regards, Riku

Sebastian Wolf kirjoitti sunnuntai 23. huhtikuuta 2017:

Hi colleagues,
  some users of my application Piepmatz are reporting
network issues when their
device network connection changes from WiFi to
Cellular and vice versa. I
couldn't reproduce it so far with my FP2 on 2.0.5. As
I'm only using standard Qt
Network classes to access the internet and no own
network detection and
especially that not only my application is affected,
it could possibly be
something in 2.1 itself. For some details see GitHub
issue
https://github.com/Wunderfitz/harbour-piepmatz/issues/11

  Didn't find anything with a quick search on
together.jolla.com , so
does somebody
of you know something about such an issue?
  Thanks for any hints and best regards, Sebastia

Re: [SailfishDevel] Qt Network: "Network access is disabled" after network change

[Tone Kastlunger]

Thanks for the quick reply;
I was actually hoping to collect some more background intel on this issue.


On Sun, Apr 30, 2017 at 10:56 PM, Slava Monich 
wrote:

> Unfortunately, no, it's an internal bug. If you would like to be notified
> via email about a potential fix, you could watch qtbase pull requests -
> those are quite rare, it shouldn't be too much of a spam.
>
> Cheers,
> -Slava
>
>
>
> Hi Slava;
> is there a MER bug for this?
>
> tortoisedoc
>
> On Sun, Apr 23, 2017 at 11:33 AM, Slava Monich 
> wrote:
>
>> Network status detection in Qt 5.6 is unreliable when the system is
>> switching between wifi and mobile data. That results in
>> QNetworkAccessManager sometimes thinking that network access is disabled
>> when in fact the device is online. At some point I attempted to fix it (
>> https://git.merproject.org/mer-core/qtbase/commit/8122f32a) however that
>> only eliminated one particular scenario of failure and reduced the
>> probability. But it's still happening. As I understood it's a random thing
>> (race condition) triggered by two connman services changing their status
>> more or less simultaneously.
>>
>> Jolla's Weather app also uses XmlListModel and suffers from the same
>> issue.
>>
>> Nobody at Jolla is actively working on it at the moment, our resources
>> are limited these days. If somebody has an idea how to fix it, feel free to
>> submit a pull request against mer-5.6 branch (
>> https://git.merproject.org/mer-core/qtbase/commits/mer-5.6).
>>
>> Best regards,
>> -Slava
>>
>>
>> Hi,
>>>
>>> The same happens in my Rush hour app available in OpenRepos. My only
>>> connection to network is via QtQuick.XmlListModel 2.0. I am using Jolla C
>>> and the latest Iijoki 2.1.0.11
>>>
>>> https://github.com/Rikujolla/trafficviewer/issues/2
>>>
>>> Best regards, Riku
>>>
>>> Sebastian Wolf kirjoitti sunnuntai 23. huhtikuuta 2017:
>>>
 Hi colleagues,
   some users of my application Piepmatz are reporting network issues
 when their
 device network connection changes from WiFi to Cellular and vice versa.
 I
 couldn't reproduce it so far with my FP2 on 2.0.5. As I'm only using
 standard Qt
 Network classes to access the internet and no own network detection and
 especially that not only my application is affected, it could possibly
 be
 something in 2.1 itself. For some details see GitHub issue
 https://github.com/Wunderfitz/harbour-piepmatz/issues/11
   Didn't find anything with a quick search on together.jolla.com, so
 does somebody
 of you know something about such an issue?
   Thanks for any hints and best regards, Sebastia

>>>
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>>
>
>
>
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Re: [SailfishDevel] Qt Network: "Network access is disabled" after network change

[Slava Monich]

Unfortunately, no, it's an internal bug. If you would like to be 
notified via email about a potential fix, you could watch qtbase pull 
requests - those are quite rare, it shouldn't be too much of a spam.


Cheers,
-Slava



Hi Slava;
is there a MER bug for this?

tortoisedoc

On Sun, Apr 23, 2017 at 11:33 AM, Slava Monich > wrote:


Network status detection in Qt 5.6 is unreliable when the system
is switching between wifi and mobile data. That results in
QNetworkAccessManager sometimes thinking that network access is
disabled when in fact the device is online. At some point I
attempted to fix it
(https://git.merproject.org/mer-core/qtbase/commit/8122f32a
)
however that only eliminated one particular scenario of failure
and reduced the probability. But it's still happening. As I
understood it's a random thing (race condition) triggered by two
connman services changing their status more or less simultaneously.

Jolla's Weather app also uses XmlListModel and suffers from the
same issue.

Nobody at Jolla is actively working on it at the moment, our
resources are limited these days. If somebody has an idea how to
fix it, feel free to submit a pull request against mer-5.6 branch
(https://git.merproject.org/mer-core/qtbase/commits/mer-5.6
).

Best regards,
-Slava


Hi,

The same happens in my Rush hour app available in OpenRepos.
My only connection to network is via QtQuick.XmlListModel 2.0.
I am using Jolla C and the latest Iijoki 2.1.0.11

https://github.com/Rikujolla/trafficviewer/issues/2


Best regards, Riku

Sebastian Wolf kirjoitti sunnuntai 23. huhtikuuta 2017:

Hi colleagues,
  some users of my application Piepmatz are reporting
network issues when their
device network connection changes from WiFi to Cellular
and vice versa. I
couldn't reproduce it so far with my FP2 on 2.0.5. As I'm
only using standard Qt
Network classes to access the internet and no own network
detection and
especially that not only my application is affected, it
could possibly be
something in 2.1 itself. For some details see GitHub issue
https://github.com/Wunderfitz/harbour-piepmatz/issues/11

  Didn't find anything with a quick search on
together.jolla.com , so does
somebody
of you know something about such an issue?
  Thanks for any hints and best regards, Sebastia


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Re: [SailfishDevel] Qt Network: "Network access is disabled" after network change

[Tone Kastlunger]

Hi Slava;
is there a MER bug for this?

tortoisedoc

On Sun, Apr 23, 2017 at 11:33 AM, Slava Monich 
wrote:

> Network status detection in Qt 5.6 is unreliable when the system is
> switching between wifi and mobile data. That results in
> QNetworkAccessManager sometimes thinking that network access is disabled
> when in fact the device is online. At some point I attempted to fix it (
> https://git.merproject.org/mer-core/qtbase/commit/8122f32a) however that
> only eliminated one particular scenario of failure and reduced the
> probability. But it's still happening. As I understood it's a random thing
> (race condition) triggered by two connman services changing their status
> more or less simultaneously.
>
> Jolla's Weather app also uses XmlListModel and suffers from the same issue.
>
> Nobody at Jolla is actively working on it at the moment, our resources are
> limited these days. If somebody has an idea how to fix it, feel free to
> submit a pull request against mer-5.6 branch (
> https://git.merproject.org/mer-core/qtbase/commits/mer-5.6).
>
> Best regards,
> -Slava
>
>
> Hi,
>>
>> The same happens in my Rush hour app available in OpenRepos. My only
>> connection to network is via QtQuick.XmlListModel 2.0. I am using Jolla C
>> and the latest Iijoki 2.1.0.11
>>
>> https://github.com/Rikujolla/trafficviewer/issues/2
>>
>> Best regards, Riku
>>
>> Sebastian Wolf kirjoitti sunnuntai 23. huhtikuuta 2017:
>>
>>> Hi colleagues,
>>>   some users of my application Piepmatz are reporting network issues
>>> when their
>>> device network connection changes from WiFi to Cellular and vice versa. I
>>> couldn't reproduce it so far with my FP2 on 2.0.5. As I'm only using
>>> standard Qt
>>> Network classes to access the internet and no own network detection and
>>> especially that not only my application is affected, it could possibly be
>>> something in 2.1 itself. For some details see GitHub issue
>>> https://github.com/Wunderfitz/harbour-piepmatz/issues/11
>>>   Didn't find anything with a quick search on together.jolla.com, so
>>> does somebody
>>> of you know something about such an issue?
>>>   Thanks for any hints and best regards, Sebastia
>>>
>>
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Re: [SailfishDevel] Qt Network: "Network access is disabled" after network change

[Riku]

Thans for an answer! There is thread in TJC so if you can answer that thread it 
would be nice.

https://together.jolla.com/question/157865/apps-loose-connection-when-phone-switches-from-wifi-to-mobile-network/

Riku

Slava Monich kirjoitti sunnuntai 23. huhtikuuta 2017:
> Network status detection in Qt 5.6 is unreliable when the system is 
> switching between wifi and mobile data. That results in 
> QNetworkAccessManager sometimes thinking that network access is disabled 
> when in fact the device is online. At some point I attempted to fix it 
> (https://git.merproject.org/mer-core/qtbase/commit/8122f32a) however 
> that only eliminated one particular scenario of failure and reduced the 
> probability. But it's still happening. As I understood it's a random 
> thing (race condition) triggered by two connman services changing their 
> status more or less simultaneously.
> 
> Jolla's Weather app also uses XmlListModel and suffers from the same issue.
> 
> Nobody at Jolla is actively working on it at the moment, our resources 
> are limited these days. If somebody has an idea how to fix it, feel free 
> to submit a pull request against mer-5.6 branch 
> (https://git.merproject.org/mer-core/qtbase/commits/mer-5.6).
> 
> Best regards,
> -Slava
> 
> 
> > Hi,
> >
> > The same happens in my Rush hour app available in OpenRepos. My only 
> > connection to network is via QtQuick.XmlListModel 2.0. I am using Jolla C 
> > and the latest Iijoki 2.1.0.11
> >
> > https://github.com/Rikujolla/trafficviewer/issues/2
> >
> > Best regards, Riku
> >
> > Sebastian Wolf kirjoitti sunnuntai 23. huhtikuuta 2017:
> >> Hi colleagues,
> >>   
> >> some users of my application Piepmatz are reporting network issues when 
> >> their
> >> device network connection changes from WiFi to Cellular and vice versa. I
> >> couldn't reproduce it so far with my FP2 on 2.0.5. As I'm only using 
> >> standard Qt
> >> Network classes to access the internet and no own network detection and
> >> especially that not only my application is affected, it could possibly be
> >> something in 2.1 itself. For some details see GitHub issue
> >> https://github.com/Wunderfitz/harbour-piepmatz/issues/11
> >>   
> >> Didn't find anything with a quick search on together.jolla.com, so does 
> >> somebody
> >> of you know something about such an issue?
> >>   
> >> Thanks for any hints and best regards, Sebastia
> 
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Re: [SailfishDevel] Qt Network: "Network access is disabled" after network change

[Sebastian Wolf]

Hi Slava, hi colleagues,
 
> Slava Monich  hat am 23. April 2017 um 10:33
> geschrieben:
>
>
> Network status detection in Qt 5.6 is unreliable when the system is
> switching between wifi and mobile data. That results in
> QNetworkAccessManager sometimes thinking that network access is disabled
> when in fact the device is online. At some point I attempted to fix it
> (https://git.merproject.org/mer-core/qtbase/commit/8122f32a) however
> that only eliminated one particular scenario of failure and reduced the
> probability. But it's still happening. As I understood it's a random
> thing (race condition) triggered by two connman services changing their
> status more or less simultaneously.
>
> Jolla's Weather app also uses XmlListModel and suffers from the same issue.
>
> Nobody at Jolla is actively working on it at the moment, our resources
> are limited these days. If somebody has an idea how to fix it, feel free
> to submit a pull request against mer-5.6 branch
> (https://git.merproject.org/mer-core/qtbase/commits/mer-5.6).

thanks for the detailed insights. Completely understand that your resources are
limited. However, I have to admit that my knowledge to help to fix that as
well... :( 
 
Crossing my fingers that somebody might be able to tackle this problem.
 
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Re: [SailfishDevel] Qt Network: "Network access is disabled" after network change

[Slava Monich]

Network status detection in Qt 5.6 is unreliable when the system is 
switching between wifi and mobile data. That results in 
QNetworkAccessManager sometimes thinking that network access is disabled 
when in fact the device is online. At some point I attempted to fix it 
(https://git.merproject.org/mer-core/qtbase/commit/8122f32a) however 
that only eliminated one particular scenario of failure and reduced the 
probability. But it's still happening. As I understood it's a random 
thing (race condition) triggered by two connman services changing their 
status more or less simultaneously.


Jolla's Weather app also uses XmlListModel and suffers from the same issue.

Nobody at Jolla is actively working on it at the moment, our resources 
are limited these days. If somebody has an idea how to fix it, feel free 
to submit a pull request against mer-5.6 branch 
(https://git.merproject.org/mer-core/qtbase/commits/mer-5.6).


Best regards,
-Slava



Hi,

The same happens in my Rush hour app available in OpenRepos. My only connection 
to network is via QtQuick.XmlListModel 2.0. I am using Jolla C and the latest 
Iijoki 2.1.0.11

https://github.com/Rikujolla/trafficviewer/issues/2

Best regards, Riku

Sebastian Wolf kirjoitti sunnuntai 23. huhtikuuta 2017:

Hi colleagues,
  
some users of my application Piepmatz are reporting network issues when their

device network connection changes from WiFi to Cellular and vice versa. I
couldn't reproduce it so far with my FP2 on 2.0.5. As I'm only using standard Qt
Network classes to access the internet and no own network detection and
especially that not only my application is affected, it could possibly be
something in 2.1 itself. For some details see GitHub issue
https://github.com/Wunderfitz/harbour-piepmatz/issues/11
  
Didn't find anything with a quick search on together.jolla.com, so does somebody

of you know something about such an issue?
  
Thanks for any hints and best regards, Sebastia


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Re: [SailfishDevel] Qt Network: "Network access is disabled" after network change

[Riku]

Hi, 

The same happens in my Rush hour app available in OpenRepos. My only connection 
to network is via QtQuick.XmlListModel 2.0. I am using Jolla C and the latest 
Iijoki 2.1.0.11 

https://github.com/Rikujolla/trafficviewer/issues/2

Best regards, Riku

Sebastian Wolf kirjoitti sunnuntai 23. huhtikuuta 2017:
> Hi colleagues,
>  
> some users of my application Piepmatz are reporting network issues when their
> device network connection changes from WiFi to Cellular and vice versa. I
> couldn't reproduce it so far with my FP2 on 2.0.5. As I'm only using standard 
> Qt
> Network classes to access the internet and no own network detection and
> especially that not only my application is affected, it could possibly be
> something in 2.1 itself. For some details see GitHub issue
> https://github.com/Wunderfitz/harbour-piepmatz/issues/11 
>  
> Didn't find anything with a quick search on together.jolla.com, so does 
> somebody
> of you know something about such an issue?
>  
> Thanks for any hints and best regards, Sebastia

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[SailfishDevel] Qt Network: "Network access is disabled" after network change

[Sebastian Wolf]

Hi colleagues,
 
some users of my application Piepmatz are reporting network issues when their
device network connection changes from WiFi to Cellular and vice versa. I
couldn't reproduce it so far with my FP2 on 2.0.5. As I'm only using standard Qt
Network classes to access the internet and no own network detection and
especially that not only my application is affected, it could possibly be
something in 2.1 itself. For some details see GitHub issue
https://github.com/Wunderfitz/harbour-piepmatz/issues/11 
 
Didn't find anything with a quick search on together.jolla.com, so does somebody
of you know something about such an issue?
 
Thanks for any hints and best regards, Sebastian___
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