[Interest] Bluetooth on Windows 10

[Oliver Wolff]

Hi Philippe,

The current implementation requires the devices to be paired in order to 
use Bluetooth on Windows. There is a bug report about getting rid of 
that requirement (https://bugreports.qt.io/browse/QTBUG-58660) but 
that's the status quo atm.

Olli


On 24/07/2018 16:59, maitai wrote:
> Hi Oliver,
>
> No the 2 machines are not paired with anything. I've tried pairing the 
> Android Phone with the Windows machine just to check that the BT 
> device is OK, that worked, but I have removed all connections after that.
>
> Philippe.
>
> Le 24-07-2018 14:00, Oliver Wolff a écrit :
>> Hi Philippe,
>>
>> are the two machines paired? Windows API does not allow pairing them,
>> so the initial pairing has to be using the system UI.
>>
>> Olli
>>
>>
>> On 24/07/2018 10:32, maitai wrote:
>>> Thanks Alex,
>>>
>>> I have done that, but although it seems to do things, I cannot make 
>>> it work on Windows (server or client). It works finally between a 
>>> Mac and an Android device.
>>>
>>> For instance if I run the BT discovery example I get:
>>>
>>> qt.bluetooth.winrt: Worker started
>>> qt.bluetooth.winrt: BT  scan completed
>>> qt.bluetooth.winrt: BTLE  scan completed
>>> qt.bluetooth.winrt: onBluetoothLEDeviceFound: No device given
>>>
>>> And nothing is found (it actually finishes the scan almost 
>>> immediately, which I believe is not a good sign).
>>>
>>> For the pingpong example as a server it gives:
>>>
>>> qt.bluetooth.winrt: Port 1 registered
>>> qt.bluetooth.winrt: class Microsoft::WRL::ComPtr<struct 
>>> ABI::Windows::Storage::Streams::IBuffer> __cdecl 
>>> bufferFromAttribute(const class QVariant &) Registering Uuid 
>>> attribute with length 16
>>> qt.bluetooth.winrt: Registering sequence attribute
>>> qt.bluetooth.winrt: class Microsoft::WRL::ComPtr<struct 
>>> ABI::Windows::Storage::Streams::IBuffer> __cdecl 
>>> bufferFromAttribute(const class QVariant &) Registering Uuid 
>>> attribute with length 2 "{00001002-0000-1000-8000-00805f9b34fb}"
>>> qt.bluetooth.winrt: class Microsoft::WRL::ComPtr<struct 
>>> ABI::Windows::Storage::Streams::IBuffer> __cdecl 
>>> bufferFromAttribute(const class QVariant &) Registered sequence 
>>> attribute with length 3
>>> qt.bluetooth.winrt: Registering sequence attribute
>>> qt.bluetooth.winrt: class Microsoft::WRL::ComPtr<struct 
>>> ABI::Windows::Storage::Streams::IBuffer> __cdecl 
>>> bufferFromAttribute(const class QVariant &) Registering Uuid 
>>> attribute with length 2 "{00001101-0000-1000-8000-00805f9b34fb}"
>>> qt.bluetooth.winrt: class Microsoft::WRL::ComPtr<struct 
>>> ABI::Windows::Storage::Streams::IBuffer> __cdecl 
>>> bufferFromAttribute(const class QVariant &) Registered sequence 
>>> attribute with length 3
>>> qt.bluetooth.winrt: bool __cdecl 
>>> repairProfileDescriptorListIfNeeded(class 
>>> Microsoft::WRL::ComPtr<struct 
>>> ABI::Windows::Storage::Streams::IBuffer> &) Repairing profile 
>>> descriptor list
>>> qt.bluetooth.winrt: class Microsoft::WRL::ComPtr<struct 
>>> ABI::Windows::Storage::Streams::IBuffer> __cdecl 
>>> bufferFromAttribute(const class QVariant &) Registering attribute of 
>>> type QMetaType::QString
>>>
>>> I tried with 2 windows machines, making sure they are discoverable, 
>>> etc. The mac machine detects the Windows machine, but not the opposite.
>>>
>>> Probably I am doing something wrong, still investigating.
>>> Philippe
>>>
>>> Le 24-07-2018 10:13, Alex Blasche a écrit :
>>>> Adding
>>>>
>>>> QLoggingCategory::setFilterRules(QStringLiteral("qt.bluetooth* = 
>>>> true"));
>>>>
>>>> to your main() might help.
>>>>
>>>> -- Alex
>>>>
>>>> ________________________________________
>>>> From: Interest
>>>> <interest-bounces+alexander.blasche=qt.io at qt-project.org> on behalf of
>>>> maitai <maitai at virtual-winds.org>
>>>> Sent: Monday, 23 July 2018 6:34:15 PM
>>>> To: Interest at qt-project.org
>>>> Subject: Re: [Interest] Bluetooth on Windows 10
>>>>
>>>> Ok, thanks Alex for the clear answer, that is a great news.
>>>>
>>>> I have tried the pingpong-bluetooth example and couldn't make it 
>>>> work. I
>>>> tried various machines (2 Windows 10/1803, 1 Windows/1 Android, 1 
>>>> Mac/1
>>>> Android, etc), I do not see any debug or strange messages but the 
>>>> client
>>>> never finds the server (Qt 5.11.1).
>>>>
>>>> Now that I know that it should work I will dig deeper
>>>>
>>>> Thanks again
>>>> Philippe.
>>>>
>>>> Le 23-07-2018 17:17, Alex Blasche a écrit :
>>>>>> -----Original Message-----
>>>>>> From: Interest
>>>>>> <interest-bounces+alexander.blasche=qt.io at qt-project.org> On
>>>>>> Behalf Of maitai
>>>>>
>>>>>> I have already read many posts on this topic, but I cannot 
>>>>>> understand
>>>>>> the
>>>>>> following statement in the documentation:
>>>>>>
>>>>>> "Despite there not being a Win32 port yet, the WinRT backend is
>>>>>> automatically
>>>>>> used if the win32 target platform supports the required WinRT APIs.
>>>>>> Minimal
>>>>>> requirement is Windows 10 version 1507 with slightly improved 
>>>>>> service
>>>>>> discovery
>>>>>> since Windows 10 version 1607. Therefore Windows 7 and 8.x 
>>>>>> targets are
>>>>>> excluded."
>>>>>
>>>>> The Win32 build will silently use WinRT-only API to enable this
>>>>> feature. This works because we can assume that the relevant windows
>>>>> builds have the required API. There is a runtime check that guards 
>>>>> the
>>>>> implementation.
>>>>>
>>>>>> Does it mean QBluetooth (regular) will work on Windows 10 version 
>>>>>> 1803
>>>>>> out of
>>>>>> the box?
>>>>>
>>>>> Yes, it should.
>>>>>
>>>>> -- Alex
>>>>>
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