2023-06-14: Release 1.3

TR-369 Document

Release contains the specification for the User Services Platform 1.3

• Adds Appendix VI, "Software Modularization and USP-Enabled
  Applications Theory of Operation"
• Adds new Unix Domain Socket MTP
• Adds two new messages, "Register" and "Deregister", and associated
  error codes (primarily for use with Appendix VI but can be
  used in many scenarios)
• Adds new Software Module Management features
• Adds a note about the use of the new TriggerAction parameter in
  Subscription objects
• Updates "Authentication and Authorization" to include the use of
  new SecuredRole
• Updates the Add message to allow for Search Paths and clarifies the
  application of permissions during Add messages
• Obsoletes CoAP as an MTP
• Adds two new requirements regarding Unique Key immutability
• Clarifies how Set should respond when using a Search Path where one
  or more objects fail to update
• Updates the use of EndpointID in WebSocket arguments
  and adds an fqdn authority scheme
• Addesses a potential attack vector with using MQTT, and updates other
  MQTT behavior
• Updates Annex A to explain use of the "Exclude" parameter
• Updates Discovery to include the use of DHCP options for agent-device
  association
• Adds a note about USP protocol versioning and Controller/Agent
  behavior
• Clarifies and updates the use of certain error codes
• Clarifies the behavior of Get messages when asking for specific
  Multi-Instance Objects that don't exist
• Clarifies some behavior when responding via USP Records
• Updates message flow diagrams to remove the implication of ordered
  responses
• Adds new requirement R-SEC.4b for Trusted Brokers

USP Protocol Buffers Schemas

USP v1.3 Record Schema

• Adds UDSConnectRecord

USP v1.3 Message Schema

• Adds Register and Deregister messages