O-MI/O-DF standards as interoperability enablers for Industrial Internet: A performance analysis

Abstract

Abstract-The Industrial Internet should provide means to create ad hoc and loosely coupled information flows between objects, users, services, and business domain systems. However, today's technologies and products often feed 'vertical silos' (e.g., vertical/siloed apps), which inevitably result in multiple and non-interoperable systems. Standardization will play an everincreasing part in enabling information to flow between such vertically-oriented closed systems. This paper presents recent IoT messaging standards, notably O-MI (Open Messaging Interface) and O-DF (Open Data Format), whose initial requirements were defined for enhanced collaboration and interoperability in product lifecycle management. The performance of those standards is evaluated in terms of efficiency ratio, defined as the percentage of payload over traffic load. A first analytical model of the efficiency ratio based on the required/basic standard specifications is then proposed. A smart maintenance use case relying on the first version of the standard reference implementation is developed, based on which our analytical model is applied to evaluate the degree of deviation (w.r.t. the standard specifications) of this reference implementation.

Access Time Improvement Framework for Standardized IoT Gateways

“…O-MI provides a generic open API for transporting data payloads in nearly any format. The complementary O-DF standard is currently the most common text-based payload format due to its flexibility [8]. O-DF is defined as a simple ontology, specified using XML schema, which is generic enough for representing any object in the IoT.…”

“…O-DF is defined as a simple ontology, specified using XML schema, which is generic enough for representing any object in the IoT. The four basic operations for sending O-MI requests are read, write, cancel, and subscribe (a specific read operation) [8] [9]. Since the gateway is one of the essential components in IoT, Morabito et al [10] propose a LEGIoT gateway architecture.…”

Model-Based Interoperability IoT Hub for the Supervision of Smart Gas Distribution Networks

“…Work, involving data model mapping, has been done in the electricity domain for the mapping of CIM to OPCUA [21]. Another generic data model is Open Data Format (O-DF) which aims at providing a unified semantic at a domain agnostic abstract level [22].…”

“…This layer uses a single meta-model that provides unified semantics at an abstract and agnostic level. This agnostic meta-model called Common Data Model (CDM) is inspired from [9], [22], [40]. The main concepts of this metamodel are: an Object is an identified container of data variables and nested objects that are organized as a hierarchical tree; a Data Variable is a container of data that is characterized by a name, a data type and a value.…”

Towards IoT data classification through semantic features

“…Contextawareness computing plays an important role in tackling this issue [4]. However, recent projects follow a vertical approach [5,6,7], with devices/manufacturers not sharing context information, or sharing it with a different structure, leading to low interoperability and information silos respectively. This has hindered interoperability and the realization of powerful IoT/M2M scenarios.…”