A method for publishing a message includes receiving, at a first relay, a subscription request from a first client, wherein the subscription request includes a target. A resting platform is disposed inside the cup-shaped base portion and spaced from the closed bottom. The method can include ultrasonically ranging a first target wall in a data center from a host rack enclosure to acquire range data for the first target wall and ultrasonically ranging a second target wall in the data center from the host rack enclosure to acquire range data for the second target wall. The address field is used to correlate to an output field that includes a stuffed data portion and a carryover segment portion.