Hello, RadDav, by USB I meant USB, not WiFi. So far I have no USB-C devices, just the earlier USB-B. I just want to monitor whether there are signals coming in from a peripheral device, though being able to see outgoing would be nice. I don't necessarily need to decode the signals, though that also would be nice. I'm just trying to do some simple troubleshooting, and want to know whether a device is active. If I had time I could build a cable breakout so I could connect an oscilloscope inline and monitor it that way, but I was looking for something available more quickly.
pm-r, I have of course tried Google search, plus a number of other Web possibilities, and found nothing that looks like what I want.