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Nrf 51 BLE HID with Get Feature example?

I am current develop a "Surface Dial" hardware compatible device. (nRF51/S110)

Everything is ok but the host PC will freeze about 30 secs after my device wake-up from sleep. I compare to "MS branded Dial", I found windows PC will send "Get Feature" command to device while Dial wakeup from sleep, Yes, the MSDial DO reply and my device DON'T.

PS: The HID spec here: http://bit.ly/2wZbax6

I try to write some code response the "Get Feature", but I can't found any document or sample code show me how to handle "Get Feature".
(ps: The "Set Feature" works fine.)

This bug stop me about 2 months , Please help! BIG thanks!

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