scan for nerby bluetooth devices in C++ code - timing issue

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I like to find somebody who is actively coding Bluetooth in Linux / C++.
I am using QtCreator IDE and can scan for nearby bluetooth devices with ONE exception - per HCI each device should be scanned within about 2 seconds and scan should be completed within about 30 seconds.
I am unable to verify these timers . I need somebody who did the C++ blueZ code to help me to trace these timers.
The object implemented using Qt version of blueZ library just tells me " device discovered" and there is no timing value I can find in source code.

Again - I am at C++ code level and so far only implementing " scan for nearby devices ".