DBus async response. Correct way.

[Pavel Romankov]

Hello.
I have module UartGateway, which is wrapper on uart interface. It send messages via uart. This module has dbus interface to communicate with other modules.
Also I have module UartClient which can use UartGateway interface to get some data via uart.
In my UartClient I can call something like this:

auto pendingCall =  UartGatewayInterface->getVoltage();
QDBusPendingCallWatcher *watcher = new QDBusPendingCallWatcher(pendingCall, this);
connect(watcher, &QDBusPendingCallWatcher::finished, [this](QDBusPendingCallWatcher *call){
        QDBusPendingReply<quint32> reply = *call;
        if (reply.isError()) {
            qWarning() << "Error occured";
        } else {
            processResult(reply.argumentAt<0>());
        }
}

in UartGateway method getVoltage() is called (by adapter)

quint32 UartGateway::getVoltage(){
// need to send request by uart and return result
}

Method getVoltage() works syncrounosly.
As I need to send request via uart and process responce asyncrounosly, what is correct way to do it?