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NRF52840 USB HID Consumer Control

I'm developing a USB Keyboard Receiver. But I founed that there's no APIs and no descriptions about HOW TO SEND CONSUMER KEY and NORMAL KEY in USB HID mode. 

I find a lot of documents, someone say that I need two USB Interfaces,one is Desktop Page the other is Consumer page. I tried it ,but it can't work successfully.

The other says that I need a HID_Description with Consumer and Desktop,but I can't understand to do.

So,how to use normal key and consumer key in USB HID mode? How to send consumer key using current APIs?

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