Android Multicast can't receive!

[ken_liu]

Hi guys:

I'm new comer, and I want start a project that Android App communicate with Windows PC.

I want to send package to multicast group from PC, and Android App join multicast group and listen the group.

My platform: Windows 8.1, Qt Creator 3.3.0, Qt 5.4.0(MSVC 2010. 32bit)

So I use example 「Multicast Receiver Example」、「Multicast Sender Example」, PC start Sender, App start Receiver, but App can't receive any package from multicast.
I was tried use two phone run receiver and sender example, or two PC, it works, but PC and App works failed.
But why ?
I was search a topic, link as below
http://qt-project.org/forums/viewthread/21081
and
https://bugreports.qt-project.org/browse/QTBUG-34111

That says need to set
android.permission.ACCESS_NETWORK_STATE
android.permission.WRITE_EXTERNAL_STORAGE
android.permission.ACCESS_WIFI_STATE
android.permission.CHANGE_WIFI_MULTICAST_STATE
android.permission.INTERNET

But I don't know how to set it.
If I set it, can solve my problem ? or other way?

Thanks everybody read my problem with my poor English....