Determining the USB hub port to which an iPad is connected

Hi. I wish I'd found a way to determine the USB hub port to which an iPad is connected, even if it means creating a one-time mapping of identifiers and ports beforehand. I thought I'd find some hardware identifiers that might help, but they appear to fluctuate depending on how the iPad carts are connected to the Mac. Is there anything reliable to achieve the desired result? Thanks for your insights. Franck