For a device to be IoT-compatible or an IoT-based application, it should have very little or no human interaction for its control. Per se only a sensor network may not qualify as an IoT application. Although, by definition, the IoT refers to uniquely identifiable objects and their virtual representations in an Internet-like structure (not necessarily use Internet). We may choose to call it an Internet of Humans and Things (IHAT?) or something like that, but surely not an IoT. So, in short, all sensor networks may not qualify as an IoT applications.