Fix pairing UI on Linux

[VShell]

On Linux when building with Qt5, the pairing UI fails to display any devices, with the following warnings:

default       2023.09.07 17:11:32.358 10950 W (unknown:0)                                                                       : QMetaProperty::read: Unable to handle unregistered datatype 'RemoteDeviceFilterModel*' for property 'governikus::RemoteServiceModel::availableDevicesInPairingMode'
default       2023.09.07 17:11:32.358 10950 W (unknown:0)                                                                       : QMetaProperty::read: Unable to handle unregistered datatype 'RemoteDeviceFilterModel*' for property 'governikus::RemoteServiceModel::unavailablePairedDevices'
default       2023.09.07 17:11:32.359 10950 W (unknown:0)                                                                       : QMetaProperty::read: Unable to handle unregistered datatype 'RemoteDeviceFilterModel*' for property 'governikus::RemoteServiceModel::availablePairedDevices'

After registering this class with qRegisterMetaType, the pairing UI functions correctly on Linux, allowing me to pair a smartphone and authenticate to service providers using my Aufenthaltstitel.

[CLAassistant]

All committers have signed the CLA.

[misery]

Interesting... we have no problems on tested Linux-Distributions. Which distro do you use? Did you use a distro package or self built?

[VShell]

I originally found this issue with the NixOS package, with no patches/etc. Specific version info dumped from the application:

init          2023.09.08 10:12:09.139 82874 I printInfo(init/Bootstrap.cpp:60)                                           : ### Application: AusweisApp2
init          2023.09.08 10:12:09.139 82874 I printInfo(init/Bootstrap.cpp:60)                                           : ### Application Version: 1.26.7
init          2023.09.08 10:12:09.139 82874 I printInfo(init/Bootstrap.cpp:60)                                           : ### Organization:
init          2023.09.08 10:12:09.139 82874 I printInfo(init/Bootstrap.cpp:60)                                           : ### Organization Domain:
init          2023.09.08 10:12:09.139 82874 I printInfo(init/Bootstrap.cpp:60)                                           : ### System: NixOS 23.11 (Tapir)
init          2023.09.08 10:12:09.139 82874 I printInfo(init/Bootstrap.cpp:60)                                           : ### Kernel: 6.1.51
init          2023.09.08 10:12:09.139 82874 I printInfo(init/Bootstrap.cpp:60)                                           : ### Architecture: x86_64
init          2023.09.08 10:12:09.139 82874 I printInfo(init/Bootstrap.cpp:60)                                           : ### Device: katy
init          2023.09.08 10:12:09.139 82874 I printInfo(init/Bootstrap.cpp:60)                                           : ### Qt Version: 5.15.10
init          2023.09.08 10:12:09.139 82874 I printInfo(init/Bootstrap.cpp:60)                                           : ### OpenSSL Version: OpenSSL 3.0.10 1 Aug 2023

[mptei]

I have the same problem with AusweisApp2-1.26.7 on Gentoo-Linux and on Endeavour.
The same warning appears and the mobile phone is not recognized.
After applying the PR it works (on Gentoo).

##################################################                                     
### Application: AusweisApp2                                                           
### Application Version: 1.26.7                                                        
### Organization:                                                                      
### Organization Domain:                                                               
### System: Gentoo Linux                                                               
### Kernel: 6.1.41-gentoo                                                              
### Architecture: x86_64                                                               
### Device: bigmon                                                                     
### Qt Version: 5.15.10                                                                
### OpenSSL Version: OpenSSL 3.0.9 30 May 2023                                         
################################################## 

[misery]

Is it possible to try with Qt 6.4 or higher to isolate the problem?

[misery]

@VShell @mptei Could you retry with Qt 6.4?

[mptei]

I have tried it on another computer:

##################################################
### Application: AusweisApp2
### Application Version: 1.26.7
### Organization: 
### Organization Domain: 
### System: EndeavourOS
### Kernel: 6.5.7-arch1-1
### Architecture: x86_64
### Device: mikesair
### Qt Version: 6.6.0
### OpenSSL Version: OpenSSL 3.1.3 19 Sep 2023
##################################################

it shows the same behavior (not finding the smartphone), but I can't see the warning from #47 (comment).

[misery]

@mptei Is it fixed with this patch?

[sleepylinde]

I'm assuming this has not been fixed, since I downloaded the package today from the AUR and the app does not find my phone to pair it.

##################################################
### Application: AusweisApp
### Application Version: 2.0.0
### Organization: 
### Organization Domain: 
### System: EndeavourOS
### Kernel: 6.6.8-zen1-1-zen
### Architecture: x86_64
### Device: linde
### Qt Version: 6.6.1
### OpenSSL Version: OpenSSL 3.2.0 23 Nov 2023

Works fine on a windows pc in the same network.

[misery]

I'm assuming this has not been fixed, since I downloaded the package today from the AUR and the app does not find my phone to pair it.

Do you still have Unable to handle unregistered datatype 'RemoteDeviceFilterModel*' in your log file? Please provide a log.

[sleepylinde]

It just does not have any errors regarding the scan (just a couple about images and failed downloads of what I'm assuming resources)

I opened the pairing dialog, waited a solid minute and then switched to another tab and then back to pairing (twice) while also having the pairing open on my smartphone.
error_log.log

[kgraefe]

Not sure if that's helpful to anyone, but I thought I have the same problem. I'm fairly new to EndeavourOS and I did not know it has a firewall running. Opening UDP port 24727 in the firewall-config GUI solved it for me on

##################################################
### Application: AusweisApp
### Application Version: 2.0.0
### Organization:
### Organization Domain:
### System: EndeavourOS
### Kernel: 6.6.10-arch1-1
### Architecture: x86_64
### Device: okeanos
### Qt Version: 6.6.1
### OpenSSL Version: OpenSSL 3.2.0 23 Nov 2023
##################################################

[misery]

Seems this error in log file in not reproducible in Qt6. Feel free to re-open if it has the SAME log messages.

[Nols1000]

Hey I had a similar issue on my openSuse machine. Opening the firewall port did allow pairing the device. Is there some documentation on this, somewhere other than this PR?