<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>Welcome back Lauri !</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal; "><span><br></span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal; "><span>BogDan.</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: 'times new roman', 'new york', times, serif; background-color: transparent; font-style: normal; "><span> </span></div><div><br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; margin-top: 5px; padding-left: 5px;"> <div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "> <div
style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "> <div dir="ltr"> <font size="2" face="Arial"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Lauri Laanmets <lauri.laanmets@proekspert.ee><br> <b><span style="font-weight: bold;">To:</span></b> Kate Alhola <kate.alhola@gmail.com> <br><b><span style="font-weight: bold;">Cc:</span></b> necessitas-devel@kde.org <br> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, January 3, 2013 5:00 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: Crash when using Bluetooth<br> </font> </div> <br>
<meta http-equiv="x-dns-prefetch-control" content="off"><div id="yiv1040429815">
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<div class="yiv1040429815moz-cite-prefix">Hello, all<br>
<br>
I'm sorry that I have been so inactive. Kate, you have done a
great job, I took a little time to briefly go through the changes
and gave my humble comments. Hopefully I get my own set-up also up
and running at some point.<br>
<br>
Regards<br>
Lauri<br>
<br>
<br>
On 3.01.2013 15:59, Kate Alhola wrote:<br>
</div>
<blockquote type="cite">On Wed, Dec 26, 2012 at 7:33 PM, Dominique Rety <span dir="ltr"><<a rel="nofollow" ymailto="mailto:dominiquerety@hotmail.fr" target="_blank" href="mailto:dominiquerety@hotmail.fr">dominiquerety@hotmail.fr</a>></span>
wrote:<br>
<div class="yiv1040429815gmail_quote">
<blockquote class="yiv1040429815gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
<div>
<div><font face="Arial">Hi Kate,</font></div>
<div> </div>
<div><font face="Arial">Thank you for your answer.</font></div>
<div> </div>
<div><font face="Arial">I tried some traces and
modifications into the lib QtConnectivity without
success. It seems to me that functions into the
library already contain calls to JNIThreadHelper class
that should setup the Java environment by performing
jvm->AttachCurrentThread(), but this doesn't solve
the problem.</font></div>
<div> </div>
<div><font face="Arial">At the same time, I performed some
basic bluetooth tests directly through Java Eclipse
(BluetoothAdapter.getDefaultAdapter.getName), which
work fine on Nexus 7 with Android 4.2.</font></div>
<div><font face="Arial">However, our project contains some
legacy parts that have already been developed in C,
and using Qt would be the very best way to integrate
them. Therefore I will only envision to implement a
direct bridge between Java and C parts as a last
resort if I can't find a viable solution with Qt.</font></div>
<div> </div>
<div><font face="Arial">Consequently, I am very interested
by your patches even before the next release, which
could be helpful for us to take a decision for our
development. Overriding and deploying the default
Necessitas lib QtConnectivity is not a problem for me,
at least for test purpose.</font></div>
</div>
</div>
</blockquote>
<div><br>
Now patches are on Review board <a rel="nofollow" target="_blank" href="https://git.reviewboard.kde.org/r/108113/">https://git.reviewboard.kde.org/r/108113/</a>
. I would be happy if you could try them.<br>
<br>
Sorry about delays publishing them <br>
<br>
<br>
Kate<br>
</div>
<blockquote class="yiv1040429815gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
<div>
<div> </div>
<div><font face="Arial">Regards,</font></div>
<div><font face="Arial">Dominique</font></div>
<div> </div>
<div> </div>
<div> </div>
</div>
<blockquote dir="ltr" style="PADDING-RIGHT:0px;PADDING-LEFT:5px;MARGIN-LEFT:5px;BORDER-LEFT:#000000 2px solid;MARGIN-RIGHT:0px;">
<div class="yiv1040429815im">
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; ">----- Original Message
----- </div>
<div style="background-color: rgb(228, 228, 228); font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; background-position: initial initial; background-repeat: initial initial; "><b>From:</b>
<a rel="nofollow" title="kate.alhola@gmail.com" ymailto="mailto:kate.alhola@gmail.com" target="_blank" href="mailto:kate.alhola@gmail.com">Kate
Alhola</a> </div>
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; "><b>To:</b> <a rel="nofollow" title="dominiquerety@hotmail.fr" ymailto="mailto:dominiquerety@hotmail.fr" target="_blank" href="mailto:dominiquerety@hotmail.fr">Dominique Rety</a> </div>
</div>
<div class="yiv1040429815im">
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; "><b>Cc:</b> <a rel="nofollow" title="necessitas-devel@kde.org" ymailto="mailto:necessitas-devel@kde.org%3E" target="_blank" href="mailto:necessitas-devel@kde.org%3E"><necessitas-devel@kde.org></a>
</div>
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; "><b>Sent:</b> Wednesday,
December 26, 2012 4:36 PM</div>
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; "><b>Subject:</b> Re: Crash
when using Bluetooth</div>
<div><br>
</div>
</div>
<div>
<div class="yiv1040429815h5">
<div>On 13.12.2012, at 16.41, Dominique Rety <<a rel="nofollow" ymailto="mailto:dominiquerety@hotmail.fr" target="_blank" href="mailto:dominiquerety@hotmail.fr">dominiquerety@hotmail.fr</a>>
wrote:</div>
<div><br>
</div>
<blockquote type="cite">
<div>
<div>
<div><font face="Arial">Hi,</font></div>
<div> </div>
<div><font face="Arial">I am currently
developing a telecommunication project
involving Blutooth communication between
Android devices. For this purpose, I'm
trying to use Necessitas Bluetooth support
and I experiment very similar problems that
are described in the "Crash when using
Bluetooth" (Kate Alhola) archive thread.</font></div>
<div> </div>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>There is several issues in current necessitas
libQtConnectivity version. I have hopefully fixed
most of them and i have version of libQtConnectivity
that least works with my own applocation. I try to
deliver patches to necessitas project so that fixes
could be included in next release. </div>
<br>
<blockquote type="cite">
<div>
<div>
<div><font face="Arial">Environment:</font></div>
<div><font face="Arial">Java JDK 1.7.0_09<br>
Qt Creator 2.5.83 Based on Qt 4.8.3 running
on Linux Suze<br>
Kit = Necessitas Qt 4.8.2 for Android armv7a<br>
Compiler = Android GCC (arm-4.4.3)<br>
Android target SDK = android-16<br>
Deploy to Nexus 7 with Android version 4.2.</font></div>
<div> </div>
<div><font face="Arial">I firstly tried to
deploy the btchat sample and I faced the
same problem:</font></div>
<div><font face="Arial">JNI ERROR (app bug):
accessed stale local reference 0xe680001d
(index 7 in a table of size 4)<br>
VM aborting<br>
Fatal signal 11 (SIGSEGV) at 0xdeadd00d
(code=1), thread 13965 (.example.btchat)</font></div>
<div> </div>
<div><font face="Arial">Setting traces in
different source files of the connectivity
library, I also noticed that the error
happens when trying to use some member
functions of QBluetoothLocalDevice (btchat
sample requests for the local device name
from the main function).</font></div>
<div> </div>
<div><font face="Arial">I tried to bypass this
problem by only creating the
QBluetoothLocalDevice without requesting for
the device name in the btchat application.
The program then starts correctly.</font></div>
<div> </div>
<div><font face="Arial">In the btchat
application, the "Connect" button calls the
QBluetoothServiceDiscoveryAgent::start
function. This function randomly processes
the request because it relies on
discoveryState and deviceAddress members,
which seem not to be initialized : either
the discovery process freezes or the program
aborts with an error (if luckily
discoveryState and deviceAddress members get
consistent values). I didn't try any further
investigation. It seems to me that the
connectivity library is compiled with
qbluetoothlocaldevice_p.cpp, which just
contains empty functions for the
QBluetoothLocalDevice class, instead of a
customized source for Android.</font></div>
<div> </div>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>Yes, that's case. The QBluetoothLocalDevice
initializes static handles to java virtual machine
that are then referenced by other modules. I have
made fixes to several parts of libQtConnectivity</div>
<div><br>
</div>
<br>
<blockquote type="cite">
<div>
<div>
<div><font face="Arial">Is Bluetooth support for
Android in Necessitas complete ?</font></div>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>Most of, some functions are still missing but
there are some bugs in current version</div>
<br>
<blockquote type="cite">
<div>
<div>
<div><font face="Arial">Is the btchat sample
expected to work properly with Android ?</font></div>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>I have not tried that one</div>
<br>
<blockquote type="cite">
<div>
<div>
<div><font face="Arial">Is there any specific
configuration issue I could miss ?</font></div>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>That's good question, what is origin of the bugs,
does it work with older android</div>
<div>Versions ? The source reason of bugs is JNI
handles alocation that conflict with</div>
<div>Current thread structure and some that handles
are expired when used. I have only tested with</div>
<div>Android 4.x</div>
<br>
<blockquote type="cite">
<div>
<div>
<div><font face="Arial">Is there any corrective
or complement software I could download ?</font></div>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>I could make my patches avaiable before next
release but overriding default necessitas
libQtConnectivity requires some tricks</div>
<br>
<blockquote type="cite">
<div>
<div>
<div><font face="Arial">How can I progress on
this issue ? What is the best way to get
help and advices ?</font></div>
</div>
</div>
</blockquote>
<div><br>
</div>
This list works fine.
<div><br>
</div>
<div>Kate</div>
<div><br>
<blockquote type="cite">
<div>
<div>
<div> </div>
<div><font face="Arial">Regards,</font></div>
<div><font face="Arial">Dominique RETY</font></div>
<div><font face="Arial"><a rel="nofollow" href="">dominiquerety@hotmail.fr</a></font></div>
<div> </div>
</div>
</div>
</blockquote>
<blockquote type="cite">
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