I got a new MacBook Pro from late 2016, MacOS Sierra, 2 thunderbolt 3 ports.
In this machine I need to plug in one external monitor via HDMI, and a few USB devices (mouse and keyboards). For this I bought an adapter that plugs in to the Mac's USB-C port, and supplies two USB 3.1 ports, one HDMI port and a power delivery for the USB-C power supply. The adapter is: Promate uniHub-C (https://www.promate.net/products/unihub-c)
The power supply works, when I plug in the power cable to the adapter, the computer charges.
The HDMI works with another monitor.
My external USB hard drive works, so the mouse/keyboard issue feels strange.
When I have a USB keyboard plugged in, and an external hard drive - the System Report > USB shows as follows. The keyboard and the hard drive are both plugged in to the uniHub-C.
In the finder I see the hard drive though, seems to work well.
Here is the problem: the USB slots doesn't seem to do much. When I plug in mouse and keyboard in the adapter, nothing happens. I was worried that perhaps I need another kind of USB-C => USB 3 adapter for regular USB devices to work, but I can't confirm that.
How can I verify I have an active connection in each USB slot?