Digital Twins in Industrial IoT: a survey of the state of the art and of relevant standards

Industry 4.0 revolution is in full swing and the adoption process is happening in many industries. However, companies have reservations about the transition process, especially ones with older but still functional machines. The key measure for machine Industry 4.0 readiness is their ability to communicate with other machines. This paper presents the design guidelines in the creation of digital twins in Industrial Internet of Things (I-IOT). The relevant scientific works and the most popular I-IOT digital protocols in the industry are collected and presented. Considering this information and data, the list of design guidelines are extracted and presented in the corresponding section.