Function BluetoothGATTGetCharacteristics

pub unsafe fn BluetoothGATTGetCharacteristics(
    hdevice: HANDLE,
    service: Option<*const BTH_LE_GATT_SERVICE>,
    characteristicsbuffer: Option<&mut [BTH_LE_GATT_CHARACTERISTIC]>,
    characteristicsbufferactual: *mut u16,
    flags: u32,
) -> Result<()>