I also tried to recreate a new service agent for each scan, with the same result. The BLE stack crash and system notify with popup.
On 16 August 2018 at 15:10, Jérôme Godbout <godbo...@amotus.ca> wrote: > > 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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