You can/could also find Coffee HOWTO in your distro’s HOWTO package. (I found a reference back to v0.5 of the document in 1998.)
Has simple schematics to get you started for the hardware, using the parallel port to toggle relays.
It’s a very neat little document, and inspired me to write a simple kernel module so I could echo 1 | sudo tee /sys/whatever/coffee0 to turn pin 0 high on the parallel port. (This is silly, and it’s much easier to just do things in user space!)












Maybe not what you want, but have you considered VPN’ing at your router? Doesn’t help if you travel, so maybe worthless…