bluno nano, It doesn't work HID keyboard.

Hello.
I want to make nano keyboard for android or i-phone.
this keyboard only has page down and page up.
My Bluno v 1.3 is working good width android application.
But I can't success HID keyboard mode.
I am tested follow sequence:
1) +++ enter at mode
2) AT+SETTING=DEFAULT
3) AT+ROLE=ROLE_PERIPHERAL
4) AT+FSM=FSM_HID_USB_COM_BLE_AT
6) AT+MIN_INTERVAL=10
7) AT+MAX_INTERVAL=10
8) AT+KEY=4
all command response is OK.
But android did not any operation.
What is wrong for me?
Did you have any sample code for hid keyboard?
Thanks for all.
I want to make nano keyboard for android or i-phone.
this keyboard only has page down and page up.
My Bluno v 1.3 is working good width android application.
But I can't success HID keyboard mode.
I am tested follow sequence:
1) +++ enter at mode
2) AT+SETTING=DEFAULT
3) AT+ROLE=ROLE_PERIPHERAL
4) AT+FSM=FSM_HID_USB_COM_BLE_AT
6) AT+MIN_INTERVAL=10
7) AT+MAX_INTERVAL=10
8) AT+KEY=4
all command response is OK.
But android did not any operation.
What is wrong for me?
Did you have any sample code for hid keyboard?
Thanks for all.