This document defines a set of standard application layer 2x interfaces called JAUS Core Services

. JAUS Services provide the means for software entities in an unmanned system or system of unmanned systems to communicate and coordinate their activities. The Core Services represent the infrastructure commonly found across all domains and types of unmanned systems. At present, eight services are defined in this document:

Transport Service: Abstracts the functionality of the underlying communication transport layer

Events Service: Establishes a publish/subscribe mechanism for automatic messaging

Access Control: Manages preemptable exclusive control for safety critical operations

Management: Defines component life-cycle management

Time: Allows clients to query and set the system time for the component

Liveness: Provides a means to maintain connection liveness between communicating components

Discovery: Governs automatic discovery of remote entities and their capabilities

List Manager: Encompasses behavior common to doubly linked lists

Each service is described by a JAUS Service Definition (JSD) which specifies the message set and protocol required for compliance. Each JSD is fully compliant with the JAUS Service Interface Definition Language [

JSIDL ].