Usb sniffer

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My brother asked me "I have a USB label printer with a button. When I press the button, I want something on the computer to happen. What can I do?"

Answer: Build a USB sniffer. I proceed according to http://crunchbanglinux.org/forums/topic/18182/usbsnifferwireshark/ on SUSE Linux 12.1. It just works:

# yast -i wireshark
# modprobe usbmon
# lsusb
[...]
Bus 002 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
# wireshark

Now select USB Bus 2 -> Capture -> Start and you see what's on the wire!