Traditional wireless technologies have evolutionary converged to Internet of Thing (IoT) for devices and service interactions. In the past decade, the academia, industry 4.0 and end-user interest has also grown drastically in IoT applications and their services. However, this increase in IoT services demand has witnessed a new challenge of seamless interaction among heterogeneous devices that are varied, diverse and dynamic in nature. In this connection, another challenge is tracing the footprint of these IoT interactions for trust-based interactions, that further becomes complex with the introduction of new applications. For instance, in many situations, IoT services are generally not self-contained and sufficient. They need to coordinate and interact with other IoT services held in the surroundings. The large-scale deployment of IoT based services is not conceivable without addressing interoperability and services coordination related challenges. In this regard, a comprehensive set of tools and techniques associated with IoT heterogeneity and interoperability have been explored. This article proposes a middleware framework to consider IoT heterogeneity and interoperability issues in different service interactions. Later, the article investigates experimentally, the trust measurements among IOTs, their decay, and the effectiveness of dynamic selection of trust parameters along with their thresholds. Appropriateness of time intervals have also been tested in various types of service interactions. To demonstrate middleware applicability, the trust-based algorithm has been applied in a service-oriented environment along with different types of services.

传统的无线技术已经演进到设备和服务交互的物联网（IoT）。在过去的十年中，学术界，工业4.0和最终用户对IoT应用及其服务的兴趣也急剧增加。然而，物联网服务需求的增长见证了新的挑战，即各种性质，多样性和动态性的异构设备之间的无缝交互。在这方面，另一个挑战是在基于信任的交互中追踪这些IoT交互的足迹，随着新应用程序的引入，这将变得更加复杂。例如，在许多情况下，物联网服务通常不是自包含的，并且是不够的。他们需要与周围的其他物联网服务进行协调和交互。如果不解决互操作性和与服务协调相关的挑战，就不可能大规模部署基于物联网的服务。在这方面，已经探索了与物联网异构性和互操作性相关的一整套工具和技术。本文提出了一个中间件框架，以考虑不同服务交互中的IoT异构性和互操作性问题。后来，本文通过实验研究了IOT之间的信任度测量，它们的衰减以及信任参数及其阈值的动态选择的有效性。时间间隔的适当性也已在各种类型的服务交互中进行了测试。为了展示中间件的适用性，