BLE notification

helenebro

Hi,
I want communicate with a BLE device. I haven't problem to send him data but I can't be notified of event on this device. When there are a event on my BLE device, I have the warning :

qt.bluetooth.bluez: cannot find matching characteristic for notification/indication

I think it's because my device is a bit strange. I have :

- service_1 
   |_ characteritic_1
   |_ characteritic_2
   |_ characteritic_3
   |_ characteritic_4
   |_ characteritic_5
   |_ characteritic_6
       |_ descriptor_1

void MyApp::startNotifListen()
{

    if(m_controller) {
         QLowEnergyService *service = m_controller->createServiceObject(QBluetoothUuid (UUID_SERVICE_1));
        if(!service) {
            if(DEBUG)   qDebug()<<"service not found!!!";
            return;
        }
        else if(DEBUG)   qDebug()<<"service found!";
         QLowEnergyCharacteristic characteristic = service->characteristic(QBluetoothUuid(UUID_CHARACT_6));
         if(characteristic.isValid()) {
               QLowEnergyDescriptor descriptor = characteristic.descriptor(QBluetoothUuid(UUID_DESC_1));
             if(descriptor.isValid()) {
                 service->writeDescriptor(descriptor, QByteArray::fromHex("0100"));
             } else if(DEBUG)   qDebug()<<"descriptor not found";
         }
        else if(DEBUG)   qDebug()<<"characteristic not found";
    }
}

I have tested on android and there are no problem. I can enable notification on characteristic { BluetoothGatt.setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) }
I haven't found similar function on Qt.

mwallnoefer

@helenebro I managed to get to the bottom of the problem (it is due to a firmware bug in these BLE low-cost modules), see my bug report under https://bugreports.qt.io/browse/QTBUG-83363.