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Maximum size of HID Descriptor

Hi,

We have developed a mouse with nRF52832 using the ble_app_hids_mouse example.Now, I would like to add consumer usage into the hid descriptor to control media. So,  I would like to know:-

1. What is the maximum size of a HID descriptor?

2. How many HID reports can be added into the hids_init() ?

3. What is ATT MTU size? Why is it used?

Please help by answering these questions.

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