[Interest] QtBluetooth Low Energy: How to find my peripheral?

Prashant Vaibhav prashant.vaibhav at tobyrich.com
Wed Oct 12 16:34:08 CEST 2016

Hi Alexander,

Comments inline below. Thanks.

Kind Regards,
Prashant Vaibhav

> On 12 Oct 2016, at 15:45, Alexander Blasche <alexander.blasche at qt.io> wrote:
>> -----Original Message-----
>> From: Interest [mailto:interest-bounces+alexander.blasche=qt.io <http://qt.io/>@qt-
>> project.org <http://project.org/>] On Behalf Of Prashant Vaibhav
>> Sent: Wednesday, 12 October 2016 13:45
>> To: interest at qt-project.org <mailto:interest at qt-project.org>
>> Subject: [Interest] QtBluetooth Low Energy: How to find my peripheral?
>> Hi all,
>> I’m using QtBluetooth low energy API on Qt 5.7 / Android 5/6. Targeting API level
>> 19 (android 4.4+).
> What are you using Qt 5.6 or 5.7?

I’m using Qt 5.7.0.

>> My problem is that I cannot find a way to decide which of the BLE devices
>> returned during scan is mine:
>> - The advertising data is inaccessible (no API).
>> - The QBluetoothDeviceInfo.serviceUuids() function returns nothing (apparently
>> it’s for classic bluetooth)
>> - The QBluetoothDeviceInfo.name() function is null (empty string)
>> So the only information I have is the rssi (QBluetoothDeviceInfo.rssi()), which is
>> not enough to figure out the scanned device is ours. Furthermore, I cannot show
>> a list to the user to pick the device manually, since all it will have is the signal level
>> (and perhaps MAC address).
> I believe you may experience https://bugreports.qt.io/browse/QTBUG-54867 <https://bugreports.qt.io/browse/QTBUG-54867>.
> It was fixed in Qt 5.6.2 and 5.7.1. Alternatively you may cherry-pick the referenced patches into your Qt build.

Thanks for the link, I checked and it doesn’t seem relevant to my issue. Our BLE device doesn’t have major/minor numbers in its advertising packet. It does have the primary service UUID (128 bit) which we are using to identify it on iOS (native code).

Perhaps you meant https://bugreports.qt.io/browse/QTBUG-54867 <https://bugreports.qt.io/browse/QTBUG-54867> ?

> --
> Alex

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