Abstract-The development of embedded networks poses several challenges: complexity and size of the network, heterogeneity of nodes, and infrastructure dynamics. From other IT domains it is known that many of these challenges can be met by a Service Oriented Architecture (SOA). In the context of embedded networks, an application can be interpreted as a set of interacting services that produce, consume or manipulate data. However, the hard boundary conditions of embedded networks, such as limited resources and real time requirements, have to be taken into account. This paper discusses an embedded SOA ( SOA) concept based on the definition of an embedded service ( Service) term and the differences to traditional Web services based SOAs. The paper describes a middleware platform that supports the execution and development of embedded network applications by employing model based code generation and a pattern based service composition model. The advantages of the approach are showcased using an application from the building automation sector, focusing on the energy management of smart buildings.
In the past, model-based development focused mainly on functional and structural aspects of the system to be developed. Recently, several approaches to include timing aspects have been suggested. However, these approaches are typically applied in later development phases. Models specifying the requirements with respect to timing without focusing on a specific solution are missing. For example, few models support the specification of the allowed jitter of a system. In this paper, we identify requirements on languages for modeling the desired timing behavior of hard and soft real-time systems by analyzing different application domains. Based on these results, we evaluate existing approaches with respect to their suitability and present a suitable approach. Finally, this paper describes the application of the suggested approach in the context of an example from the automation domain.
Abstract-In the recent years, wireless sensor networks (WSNs) have drawn a lot of attention and a lot of work has been done to provide an efficient communication infrastructure for these systems. This paper focuses on another -not so well studied-class of embedded networks: embedded networks used for control and automation purposes. In contrast to WSNs, these networks have a comparably stable infrastructure, with a low probability of node or link failure. The main challenge for the communication in control oriented networks is the heterogeneity of the underlying infrastructure and the resource constraints already known from WSNs. We propose an adaptable communication layer that leverages existing network protocols and at the same time provides a seamless communication over heterogeneous networks and an efficient and scalable network stack for individual nodes. We show the feasibility of this approach with a demonstrator for the smart energy management in a future home automation scenario.
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