void Widget::startLookup()
{
    if (!m_discoveryAgent) {
        m_discoveryAgent = new QBluetoothDeviceDiscoveryAgent(this);
        m_discoveryAgent->setLowEnergyDiscoveryTimeout(10000);
        connect(m_discoveryAgent, &QBluetoothDeviceDiscoveryAgent::deviceDiscovered, this, &Widget::deviceDiscovered);
#ifdef QT6_BUILD
        connect(m_discoveryAgent, &QBluetoothDeviceDiscoveryAgent::errorOccurred, this, &Widget::discoveryError);
#else
        connect(m_discoveryAgent, qOverload<QBluetoothDeviceDiscoveryAgent::Error>(&QBluetoothDeviceDiscoveryAgent::error),
                this, &Widget::discoveryError);
#endif
        connect(m_discoveryAgent, &QBluetoothDeviceDiscoveryAgent::finished,
                this, &Widget::onDeviceScanFinished);
    }
}

void Widget::onDeviceScanFinished()
{
    if (m_discoveryAgent) {
        qDebug() << getEpochStr() << "=== restart discovery";
        m_discoveryAgent->start(QBluetoothDeviceDiscoveryAgent::LowEnergyMethod);
    }
}