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Spying on USB

I have a friend with a machine (uP driven) that uses an Android tablet for control. They are connected via USB. I am working under the assumption that the Android tablet is the master in this situation.

Once coms is established, the tablet presents a UI for activating the machine. My friend has a custom accessory that he wants to attach. Ideally, he'd like to inject one of the button control signals into the machine without having to touch the Android tablet.

What I'm hoping for is a bit of guidance on how we might spy on the coms between the two devices. For the moment, I'm connecting either to my PC to see if I can get a response out of it.

As ever, you thoughts and input is appreciated.

JonnyMac
Jon McPhalen
Hollywood, CA
It's Jon or JonnyMac -- please do not call me Jonny.

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