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The Internet of Things (IoT) is a paradigm in which smart objects actively collaborate with other physical and virtual resources available in the Internet. IoT environments are characterized by a high degree of heterogeneity, encompassing devices with different capabilities, functionalities, and network protocols. To address such a heterogeneity, some platforms have been proposed aiming at abstracting away the specificities of such devices and promoting interoperability among them. Nevertheless, the lack of standardization in IoT makes these platforms to often not properly address several important requirements in this context. In this context, reference architectures can define an initial set of building blocks for IoT environments and to provide a solid foundation for leveraging its wide adoption. In this paper, we introduce two recent reference architectures for IoT, namely the IoT Architectural Reference Model and the …