Facebook's Prineville, Ore. facilities manager worked on a Bluetooth link to report stats from an individual server.
But a more ambitious effort--that won the prize--worked on a sensor network to report details from many servers. I have no other info on it, though.
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.