Bug 38738 - xamarin_start_wwan not implemented (network interface fails sometimes?)
Summary: xamarin_start_wwan not implemented (network interface fails sometimes?)
Alias: None
Product: iOS
Classification: Xamarin
Component: Xamarin.iOS.dll ()
Version: XI 9.4 (iOS 9.2)
Hardware: Macintosh Mac OS
: --- major
Target Milestone: (C7)
Assignee: Rolf Bjarne Kvinge [MSFT]
Depends on:
Reported: 2016-02-13 04:42 UTC by pperera
Modified: 2016-06-02 10:37 UTC (History)
5 users (show)

Is this bug a regression?: ---
Last known good build:

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Description pperera 2016-02-13 04:42:04 UTC
Occasionally apps written in Xamarin fail to connect to the network.

I'm using HttpClient and the symptoms manifest themselves as a Task Cancelled exception. When this problem does manifest itself I see the following line in the console. 

xamarin_start_wwan not implemented

I'm not able to reproduce this 100%. However when it does happen switching wifi off, allowing the 3g network route, resolves the issue. Switching back to wifi and the problem is gone.
Comment 1 Sebastien Pouliot 2016-02-14 19:26:34 UTC
> xamarin_start_wwan not implemented

^ That message should only exists in tvOS and watchOS builds.

Please provide us with all* version informations of the software being used and the iOS version of the device(s).

Also the device logs (before and after the message) could be helpful to see the condition when this occurs. If possible please attach them to the bug report.

* The easiest way to get exact version information is to use the "Xamarin Studio" menu, "About Xamarin Studio" item, "Show Details" button and copy/paste the version informations (you can use the "Copy Information" button).
Comment 2 pperera 2016-02-14 23:40:55 UTC
=== Devices ===
observed on devices running iOS 9.x (iPhone 6+, iPad Air 3g + wifi - current latest)

=== Xamarin Studio ===

Version 5.10.2 (build 56)
Installation UUID: a5258fcf-4a75-4801-bb12-69301a300841
	Mono 4.2.2 (explicit/996df3c)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 402020030

=== Xamarin.Profiler ===

Not Installed

=== Apple Developer Tools ===

Xcode 7.2 (9548)
Build 7C68

=== Xamarin.iOS ===

Version: (Enterprise Edition)
Hash: 962a050
Branch: master
Build date: 2016-01-29 16:59:11-0500

=== Xamarin.Android ===

Version: (Enterprise Edition)
Android SDK: /Users/pperera/Library/Developer/Xamarin/android-sdk-mac_x86
	Supported Android versions:
		2.3   (API level 10)
		4.0.3 (API level 15)
		4.1   (API level 16)
		4.2   (API level 17)
		4.3   (API level 18)
		4.4   (API level 19)
		5.0   (API level 21)
		5.1   (API level 22)
		6.0   (API level 23)

SDK Tools Version: 24.4.1
SDK Platform Tools Version: 23.0.1
SDK Build Tools Version: 23.0.2

Java SDK: /usr
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)

=== Xamarin Android Player ===

Version: 0.6.5
Location: /Applications/Xamarin Android Player.app

=== Xamarin.Mac ===

Version: (Starter Edition)

=== Build Information ===

Release ID: 510020056
Git revision: bb74ff467c62ded42b7b7ac7fdd2edc60f8647b0
Build date: 2016-01-26 16:24:41-05
Xamarin addins: 8b797d7ba24d5abab226c2cf9fda77f666263f1b
Build lane: monodevelop-lion-cycle6-c6sr1

=== Operating System ===

Mac OS X 10.10.5
Darwin ADSkunkworks.switch.internal 14.5.0 Darwin Kernel Version 14.5.0
    Tue Sep  1 21:23:09 PDT 2015
    root:xnu-2782.50.1~1/RELEASE_X86_64 x86_64
Comment 3 Rolf Bjarne Kvinge [MSFT] 2016-02-15 09:46:51 UTC
I can reproduce this.

It's already been fixed in master, so it's only a problem in the cycle6 branch.

Tentative fix: https://github.com/xamarin/maccore/pull/424
Comment 5 pperera 2016-02-16 19:59:50 UTC
Eta to release?
Comment 6 Rolf Bjarne Kvinge [MSFT] 2016-02-17 08:56:45 UTC
We haven't decided yet, but my guess would be a few weeks (unfortunately I can't be more specific at this point).
Comment 8 Shruti 2016-06-02 08:30:52 UTC
We are not sure about the steps which would help us to reproduce and verify this issue.

It would be great if you provide sample project and steps which help us to reproduce this issue.

@pperera@switch.tv : It would be great help for us If you check this issue at your end as the fix build of this issue must be released at per comment(7).

Comment 9 Rolf Bjarne Kvinge [MSFT] 2016-06-02 08:56:43 UTC
You can test this by executing (on device):

    ObjCRuntime.Runtime.StartWWAN (new Uri ("http://xamarin.com"));

and verify that this is *not* printed to the device console:

    xamarin_start_wwan not implemented
Comment 10 Shruti 2016-06-02 10:37:08 UTC
@Rolf, Thanks for the information!!

I have checked this issue with latest XI with implementing commment(9) and deploy the app on iPad mini iOS 9.3.2. And observed that ' xamarin_start_wwan not implemented' message is not printing on iOS Device Log.

iOS Device Log: https://gist.github.com/shrutis360/a33c1aca6afebc6cdaea4c4aae3591f5

Environment Info: https://gist.github.com/shrutis360/9cdb6a803b8bf6e8a8921b815b09a8c0

Hence, Closing this issue.