USB
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Start Wireshark
$ sudo modprobe usbmon
$ sudo wireshark
Find associated USB port with either lsusb
or dmesg
. Example of lsusb output:
$ lsusb
...
Bus 001 Device 011: ID 047d:2048 Kensington Orbit Trackball with Scroll Ring
Set a filter with corresponding bus and device ID, i.e. usb.src == "1.11.1"
. When you move the trackball you should now see a lot of USB communication.