UDP-based Transport for Configured Subscriptions

This document describes a UDP-based transport for YANG notifications to collect data from network nodes within a controlled environment. A shim header is defined to facilitate the data streaming directly from a publishing process on a network device to telemetry receivers. Such a design enables higher frequency updates and less performance overhead on publisher and receiver processes compared to already established notification mechanisms. A YANG data model is also defined for management of the described UDP-based transport.