How to reverse-engineer a USB device without monitoring traffic? -

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how possible determine commands operate usb device, if device comes operating system , traffic monitoring software cannot installed on os. method can think of sending random commands device, until device responds, seems implausible more complex commands, , potentially dangerous. example, consider dualshock 4 controller. sony has not made official driver device, method can use create linux driver it?

get hardware protocol analyzer. won't need install software on host or device under test. here 1 have used:

http://www.totalphase.com/products/beagle-usb12/


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