Bluetooth Low Energy BLE Indicate Response

Janos

Hello,
does anybody have experience with sending out indications as a BLE peripheral?
To send out indications, I configure the characteristic accordingly (see below) and issue a write to the charactersistic:

QLowEnergyService::writeCharacteristic(characteristic, response, QLowEnergyService::WriteMode::WriteWithResponse);

By that, as opposed to notifications, I should receive a response/confirmation.
The bluez logging indeed prints out an event, that a response has been received.

But how do I get the response/confirmation into my Qt application? I registered for all the signals defined in http://doc.qt.io/qt-5/qlowenergyservice.html#signals. First I expected to receive the confirmation signal in the "characteristicWritten" signal, but then I read the note:

Note: This signal is only emitted for Central Role related use cases.

As I am a peripheral (and as indications are emitted by peripherals), through what mechanism in the Qt BLE API can I receive an indication response? Or an error?

The charactersistic is basically setup like this:

QLowEnergyDescriptorData    clientCharacConfigDescriptor;
constexpr uint8_t           rawClientCharacData[]  = { 0x02, 0x00 };
const QByteArray            qRawClientCharacData   = QByteArray::fromRawData(reinterpret_cast<const char*>(rawClientCharacData), sizeof(rawClientCharacData) / sizeof(*rawClientCharacData));
clientCharacConfigDescriptor.setUuid(QBluetoothUuid::DescriptorType::ClientCharacteristicConfiguration);
clientCharacConfigDescriptor.setValue(qRawClientCharacData);
...
QLowEnergyCharacteristicData characteristic;
characteristic.setUuid(...);
characteristic.setProperties(QLowEnergyCharacteristic::Write | QLowEnergyCharacteristic::Indicate);
characteristic.addDescriptor(clientCharacConfigDescriptor);

Maybe related: https://forum.qt.io/topic/65196/bluetooth-low-energy-characteristic-indications-not-notifications