Hi
http://doc.qt.io/qt-5/qtbluetooth-index.html
Do you have BlueZ 4.x/5.x installed ?

No, because they were neved emitted. I just found this: https://bugreports.qt.io/browse/QTBUG-38401, it seems that they are not implemented yet for Bluez 5. However, I would like to set the pin in only one-way, the raspberry shouldn't accept any pairing if the pin code (probably hardcoded in the raspberry) is different from the one entered by the user. Anyway, I'm not sure if this is possible.

@herlarbee Im using Mac El Cap. Thanks I will check out your link.

Maybe there're two ways to solve this question:

1)Windows SDK has included the bluetooth module,if you're familiar with Windows API development,it's a good choice to transplant it to Qt.

2)There're some 3r-party sdk like Bluesoleil SDK.

@SGaist Hey, thank you.
I will try it there.

I searched for days and found no way or working example, I need a way to add device and connect to Input Service of a BT-HID device without pairing.