macos - Is kIOHIDUniqueIDKey always set on an IOHIDDevice?

Question

I need a unique identifier for all instances of an IOHIDDevice, in order to keep track of individual devices in my app.

Obvious option is to use the vendor and product ids as a composite key.

However I have found kIOHIDUniqueIDKey in the Apple source. I'm assuming this is the system id that MacOS is assigning to the device when it is connected.

Is my assumption correct and can I rely on this ID to always be defined when a device is connected? (I know it changes each time the same device is disconnected then connected again).

Answer 1

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