BLE demos fail on Android

pbljung

Hi - The two Bluetooth Low Energy demos heartlistener and lowenergyscanner run fine on ios7 and ios8, but both FAIL on Android 4.4

They scan for devices, I select iOS running the lightblue app emulating HR, and then Android fail to connect with GATT_ERROR (133)

D/BluetoothGatt(26782): onClientConnectionState() - status=133 clientIf=7 device=5F:12:69:E3:10:C3
W/QtBluetoothGatt(26782): Unhandled error code on connectionStateChanged: 133
W/liblowenergyscanner.so(26782): ../src/device.cpp:283 (void Device::errorReceived(QLowEnergyController::Error)): Error: "Unknown Error"

Any ideas on how to proceed?

csanders

I see the same "Unhandled error code on connectionStateChanged: 133" message on my own program using qt's ble. Any idea on what causes this yet? I typically find if I reset the ble device and turn on and off bluetooth on the android device it will start working.

kgregory

I was getting this too. The way I finally fixed it was to re-boot my phone. Anyone know what causes this problem?

ekkescorner

@pbljung said in BLE demos fail on Android:

errorReceived

these errors can happen
see my comments on top of

void MyBluetoothDeviceInfo::onControllerError(QLowEnergyController::Error error)

in https://github.com/ekke/ekkesBTLEexample/blob/master/cpp/bt/mybluetoothdeviceinfo.cpp

not only 133 (reported as unhandled error)
also 34 and 8 can happen
see also all the discussions at https://bugreports.qt.io/browse/QTBUG-31674
per ex from my comment on 133:

while developing new example app for BT LE and Qt 5.8 using QtQuickControls2 for Android, iOS I also run into GATT ERROR 133
googled and found out that this bug iseems not to be a Qt Bug.
some more infos here:
https://github.com/NordicSemiconductor/Android-nRF-Toolbox/issues/9
https://android.googlesource.com/platform/external/bluetooth/bluedroid/+/android-5.1.1_r13/stack/include/gatt_api.h
of course would be great if Qt could handle error 133

my workaround:
if getting a QLowEnergyController::ConnectionError I try to reconnect up to 5 times with a delay of 1000ms
In most cases 2nd or 3rd retry will connect without the error.

BTW: find out more on my new BTLE Example APP: http://bit.ly/ekkeBTLEapp