The Internet of Things (IoT) is a paradigm that permits smart entities to be interconnected anywhere and anyhow. IoT opens new opportunities but also rises new issues. In this dynamic environment, trust is useful to mitigate these issues. In fact, it is important that the smart entities could know and trust the other smart entities in order to collaborate with them. So far, there is a lack of research when considering trust through the whole System Development Life Cycle (SDLC) of a smart IoT entity. In this paper, we suggest a new approach that considers trust not only at the end of the SDLC but also at the start of it. More precisely, we explore the modeling phase proposing a model-driven approach extending UML and SysML considering trust and its related domains, such as security and privacy. We propose stereotypes for each diagram in order to give developers a way to represent trust elements in an effective way. Moreover, we propose two new diagrams that are very important for the IoT: a traceability diagram and a context diagram. This model-driven approach will help developers to model the smart IoT entities according to the requirements elicited in the previous phases of the SDLC. These models will be a fundamental input for the following and final phases of the SDLC.

物联网（IoT）是允许智能实体随时随地互连的范例。物联网带来了新的机遇，但也引发了新的问题。在这种动态环境中，信任对于缓解这些问题很有用。实际上，重要的是，智能实体可以知道并信任其他智能实体，以便与它们进行协作。迄今为止，在通过智​​能物联网实体的整个系统开发生命周期（SDLC）考虑信任时，尚缺乏研究。在本文中，我们提出了一种新方法，该方法不仅要在SDLC的末尾考虑信任，还要在开始时考虑信任。更准确地说，我们探索建模阶段，提出一种模型驱动的方法来扩展UML和SysML，其中考虑了信任及其相关领域，例如安全性和隐私。我们为每个图提出构造型，以便为开发人员提供一种有效地表示信任元素的方法。此外，我们提出了两个对物联网非常重要的新图：可追溯性图和上下文图。这种模型驱动的方法将帮助开发人员根据SDLC先前各阶段提出的要求对智能IoT实体进行建模。这些模型将为SDLC的后续阶段和最终阶段提供基本输入。