Quote from MASSO Support on June 22, 2019, 10:09 am
Yes you can use a USB hub on the keyboard port of Masso to connect both a mouse and a keyboard.
On my Keyboard port I have a cheap 4 port USB hub with a wireless keyboard, a wireless mouse, Touch screen and the 4th port provides power to a VGA to HDMI adapter with no problems at all.
The other port I keep free for the USB stick.
Hope this helps