FYI -- This tiny $12 zsun device simply plugs into a USB port (for power) and
you talk to it with wifi:
This zsun device talks ONLY wifi, so you have to keep one wifi AP open to talk
to the device itself.
I highly recommend using the OpenWRT "extroot /overlay" technique with this
zsun device -- NOT because it needs more flash memory, but because it makes
possible to quickly recover if you make a configuration error: you simply take
the little micro SD card out, put it into a PC, change the config files back to
something sane, re-insert the uSD back into the zsun, and reboot. Beats the
heck out of a bricked zsun device.