I learned that the lightning port is only for power under the worst way !!!
I have an iphone 7 were the screen went black, so I hooked it through a lightning to HDMI to my TV and I could see the iphone unlock display but of course I could not enter the unlock code touching the glass so I plugged the lightning side of the lightning to USB 3 adapter to the lightning port of the HDMI port and a keyboard to the USB 3 port.
Lo and behold, the data from the keyboard going out on the lightning to USB adapter didn't reach the iphone because the lightning port of the HDMI adapter is only for power and the same goes to the USB 3 adapter.
Unfortunately the engineers who designed both adapters never though that limiting the lightning port use for providing only power was not a good idea !!!
If some one could design a smart lightning hub, that would be great !