Ecient IoT Framework for Industrial Applications

Sammanfattning: The use of low-power wireless sensor and actuator having Internet connections networks in the industry has increased in the last decade. New generations of microcontrollers, new hardware for communication and the use of standardized protocols, such as the Internet Protocol, have resulted in more interoperability possibilities than ever before. This increment of interoperability enables a sensor and actuator node to exchange information with a large number of peers, which is beneficial when creating advanced, flexible and reusable systems. The increment of interoperability increased the possible communication to malicious devices or users, for this reason, the use of encryption techniques to protect clients and servers communications must be mandatory. But even with a state of the art encryption mechanisms, there is no protection to control the access to each particular service with fine-grained precision. The nodes within an industrial wireless sensor and actuator network are resource-constrained embeddeddevices, and the increase of interoperability, therefore, requires a higher level of computation capabilities. The intrinsic limitations of memory and processing on the nodes cause an adverse effect on power consumption and communication delays; and in consequence, a shorter battery lifetime. Therefore, the standard computing solutions for Internet communications are not directly applicable and new mechanisms to achieve security, scalability, dependability, interoperability and energy efficiency are needed. Sensor and actuator IoT's network can transmit sensed data, but also offers access to the actuators. These accesses, presumably provided via services, requires an access protection. For this reason, the use of an access control mechanisms must be mandatory. An access control helps to create customized services and access policies. These access policies can isolate the access to devices with different roles, like production and maintenance. The work presented here has been probed in some projects forindustrial applications: 1) Self condition monitoring mobile machinery, an IoT solution to monitor the status of the bearings of a wheel loader. 2) Conveyor roller monitoring, the mining industry requires to control the state of a complete conveyor belt. 3) Rock bolt monitoring, a complete IoT system to monitor the status of the mining galleries, measuring deformations and vibration in the structure. Also, emphasize that the Access Control mechanism has been validated as the official Arrowhead's access control method for resource-constrained devices. The main contribution of this thesis is a new efficient IoT technology for industrial applications, including design, implementation, and experimental validation. The framework includes features to protect the communication, authentication, fine grained access control, zero configuration networking, and run-time reconfiguration. The technologies with their respective energy consumption data clearly indicate the feasibility of battery operated IoT’s integratedto functional System of Systems. The provided data also pinpoint the most critical areas for improvements.