I do have some Xiaomi devices here and will take a look at these when I get a chance. It’s worth noting though that the Xiaomi devices are not Zigbee compliant - they use Zigbee like communications, and 802.15.4, but that doesn’t make them compliant. I’ve seen other notes on the net that they don’t work with other Zigbee gateways such as SmartThings.
That’s not to say it’s not possible, and I do intend to see if it’s possible to make it work, but please be aware it may not be possible if the Xiaomi sensors don’t fully implement Zigbee protocols.
I’m not sure that logging USB traffic will help too much though - I’d probably need to see a sniffer log.