Abstract: The present disclosure generally relates to methods for sending event notifications. In some examples, a controller periodically sends messages concerning a status of an event corresponding to the controller. In some examples, at a first time while periodically sending the messages and in accordance with a determination that the status of the event has changed, the controller sends a message concerning data other than the status of the event. In some examples, at the first time while periodically sending the messages and in accordance with a determination that the status of the event has not changed, the controller continues to periodically send the messages without sending the message concerning data other than the status of the event.

Abstract: A spin device attached to the rocket nozzle to impart a relatively large unt of spin to the rocket in a short time while the rocket is guided in a tube launcher of a rearward facing step internal configuration. The device also acts as a rear shoe or sabot for the rocket. Upon contact with the rearward facing step, the spin device separates from the rocket. The forward rocket shoes leave the guidance of the forward tube at the same instant of device separation thus providing a nontip-off rocket launch.