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Decentralized configuration of embedded web services for smart home applications

机译：用于智能家居应用程序的嵌入式Web服务的分散式配置

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Web Services can be used as a communication structure for embedded devices. Out of numerous Web Service specifications there is a subset (Profile) to implement Web Services on resource constrained devices, called Devices Profile for Web Services (DPWS). The resulting service oriented architecture enables the user to discover new devices, e.g., in the local smart home network. The open standards for Web Services further define a metadata format for service description. Besides the simple invocation of service operations, an eventing mechanism is specified. A client which subscribes to an event will receive notifications. Those features and the inherent Plug&Play capability provided by Web Services are suitable to connect smart home devices in a user-friendly manner. However, DPWS specifies no standard procedure to combine multiple devices with each other to build more complex applications. Therefore, new concepts for embedded Web Service orchestration are needed. Some commercial solutions use a central hub, which represents a Single Point of Failure (SPoF). Hence, a failure would lead to a breakdown of all smart Internet of Things (IoT) applications and decrease the user acceptance. We propose a concept where no central broker is needed by defining a Configuration Service that runs on multiple devices. Based on that service a smartphone app is used to establish trigger-action rules between devices. A prototype is implemented as a proof-of-concept for different smart home devices. Furthermore, a mobile Android application to find and orchestrate the devices is presented.
机译：Web服务可以用作嵌入式设备的通信结构。在众多Web服务规范中，有一个子集（配置文件）用于在资源受限的设备上实施Web服务，称为Web服务设备配置文件（DPWS）。由此产生的面向服务的架构使用户能够发现例如本地智能家庭网络中的新设备。 Web服务的开放标准进一步定义了用于服务描述的元数据格式。除了简单地调用服务操作之外，还指定了事件处理机制。订阅事件的客户端将收到通知。 Web服务提供的那些功能和固有的即插即用功能适用于以用户友好的方式连接智能家居设备。但是，DPWS没有指定将多个设备相互组合以构建更复杂的应用程序的标准过程。因此，需要用于嵌入式Web Service编排的新概念。一些商业解决方案使用中央集线器，该集线器代表单点故障（SPoF）。因此，故障将导致所有智能物联网（IoT）应用程序崩溃，并降低用户接受度。通过定义在多个设备上运行的配置服务，我们提出了不需要中央代理的概念。基于该服务，智能手机应用程序用于在设备之间建立触发动作规则。原型被实现为针对不同智能家居设备的概念验证。此外，还提供了一个用于查找和编排设备的移动Android应用程序。

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