What is the status LED indicating?

What do the various LED modes indicate on a 4th Gen TableTV?
I see it’s blue (usually), but apparently there is also a white LED
It sometimes flashes slowly, sometimes faster. It also “pulses” other times. There’s also a low-duty cycle flash (seems to be some sort of error condition?)
And it apparently gives one and only one flash of a white LED when it starts up.
What does it all mean? Is there a reference guide?

In other topics:
There is an ssh server running on the tablo, can that be logged into?
Thhere is an http server running on port 80 and 443; if you access the root of the device it responds with just some text “Nuvyyo Tablo Server”
Is there anything else there?