We would like to develop Samsung accessory which has HID capability. Samsung phones can then recognize this accessory as USB keyboard and thus users can type on phone. Therefore, we tried Google AOA protocol, https://source.android.com/devices/accessories/aoa2.html. However, it does not work on Samsung S7. It looks like Samsung NAK the HID report. Isn't it mandatory for Android phone to comply with AOA protocol?
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