This memo defines two additional Options for the Constrained
Application Protocol (CoAP) especially targeted at sleepy sensors:
Publish and Monitor.
The Publish Option enables opportunistic updates of a given resource
state, by temporarily delegating the authority of the Publish'ed
resource to a Proxy node. The whole process is driven by the
(sleepy) origin -- which may actually never need to listen.
The Monitor Option complements the typical Observe pattern, enabling
the tracking of a resource hosted by a node sleeping most of the
time, by taking care of establishing and maintaining an Observe
relationship with the (sleepy) origin on behalf of the (sleepy)