> Minimal discovery only uses cached SDP values. If the platform does not have any values the above message is the result. You have to do an active scan/FullDiscovery.
How can we check if the device support the minimal discovery method? I just get an empty result and a trace into the console. It's like it failed silently to the application code and only leave a trace into the debug console. > This is a problem. Please report a bug As for the full discovery I end up with the following error popup on the Android device from the system*:* *"Unfortunately, Bluetooth Share has stopped."* with an ok button. After that the whole blueooth is shutdown on the device! it's the system Bluetooth stack that crash hard! The scan emit error signal: PoweredOffError Seem like if the device cannot be reach on the second scan it does crash the bluetooth stack and bring the Android Bluetooth service along with it! I have to quit the application and restart the Bluetooth stack and start over and always get the same result with the complete scan!?!? On 16 August 2018 at 01:51, Alex Blasche <alexander.blas...@qt.io> wrote: > > > > -----Original Message----- > > From: Interest <interest-bounces+alexander.blasche=qt...@qt-project.org> > On > > Behalf Of Jérôme Godbout > > Sent: Wednesday, 15 August 2018 21:55 > > To: Qt Interest <interest@qt-project.org> > > Subject: [Interest] QBluetoothServiceDiscoveryAgent cannot retrieve sdp > uuids > > > > Hi, > > I'm trying to discover some particular Bluetooth device on Android, but > I have > > some trouble using the QBluetoothServiceDiscoveryAgent. Here's the > workflow: > > > > 1. Scan using QBluetoothDeviceDiscoveryAgent to discovers all devices. > > 2. Wait for scan to complete, wait for finished() signal. > > 3. Start a scan QBluetoothServiceDiscoveryAgent for found devices > one by > > one. Using start(QBluetoothServiceDiscoveryAgent::MinimalDiscovery). I > always > > end up with the following error: cannot retrieve sdp uuids. > > Minimal discovery only uses cached SDP values. If the platform does not > have any values the above message is the result. You have to do an active > scan/FullDiscovery. > > > If I try the complete > > discovery it just crash hard! > > This is a problem. Please report a bug (https://bugreports.qt.io) that > included your Qt version, a stack trace and ideally a small test program > that reproduces the problem for you. > > > I want to discover any device that can offer a particular services and I > don't > > controls device name nor the advertising of the BLE devices. Anyway to > do this? > > Or is it a bug with my Android device or am I using it improperly? > > If you are looking for BLE services they cannot be retrieved using the SDP > (QBluetoothServiceDiscoveryAgent) unless the device choose to use a > classic advertisement too. That's usually not the case though. > > > > Do I have to use QLowEnergyControl and connect to each device one by one > to > > fetch the services list on Android to do this? > > Usually you should be able to identify the device using the device > discovery already as the device discovery reveals quite a bit of > information already. Otherwise yes, you actually have to connect. > > -- > Alex > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest >
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