# USB

## Monitor USB Communication

1. Start Wireshark

```
$ sudo modprobe usbmon
$ sudo wireshark
```

2. 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
```

3. 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.

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