I'm curious if there is a limit to the number of usb and serial to usb devices my Mac can connect to. I've got a 2015 Macbook Pro running 10.10.5 and I'm writing a python program to connect to a bunch of serial devices which I have connected to a USB hub. I have four devices on one hub and then two on another. My computer seems to have some weird issues when I connect to all of them and chat with them over serial. Any idea about limits here?