The upstream source assumes you will use a traditional hard-wired serial
port, but those are getting rare.  Rather than refactor the code, I've just
made the Debian package always open the device /dev/REG.  Associated with this,
the package delivers a udev rules file that creates a /dev/REG symlink to
/dev/ttyS0.  If you need some other device linked, creating an appropriate udev
rule is likely the best way to do that.

The 'port' field in the REG line of the eggrc file will be ignored, so just
leave it set to '0'.

			- - - - -

The systemd service file used to invoke the daemon hard-codes virtual terminal
8 as the place to run the eggsh program.  That means you can use Alt-F8 on
your system's console to go see what the program is doing.  Note that we're
assuming the machine running this program is not running X.  If it is, you
may need to tweak the service file to pick some other virtual terminal.

			- - - - -

If the EGG computer is behind a firewall, it must be programmed
to allow UDP packets on port 2510 outgoing packet and UDP port
1105 for an incoming connection.

This allows the bidirectional communication required for the data
to be transmitted. What happens is that your program sends an
"awake" packet when it has unsent data. The server in Princeton
responds with a "data request" packet, and then the EGG program
will send the data.