| dc.description.abstract | The smart factory plays an important role in realizing the Industry 4.0 concept. The Industrial Internet of Things (Industrial IoT or IIoT) is used in smart factories to connect devices or systems on production lines, such as sensing devices, robots, fieldbus devices, the human machine interface (HMI), and the supervisory control and data acquisition (SCADA) system. It aims to collect real-time data of production lines and transmit the data to back-end production systems and enterprise resource management systems to enable these back-end systems to arrange production plans and schedules reasonably and make factories advance toward the manufacturing center with adaptability and high efficiency. This study proposes the design of an industrial IoT gateway for the smart factory to connect internal and external devices/systems of the factory. The design goals are fivefold and are shown below. (1) To translate multiple communication protocols so that devices using different protocols can interoperate with each other. (2) To improve the overall stability of the system so that subsystems of different architectures and computation models can be adapted to fit each other. (3) To provide data modeling capabilities so that data can be converted into meaningful information models. (4) To provide a horizontal data delivery architecture so that messages of a device can be shared with multiple systems. (5) To strengthen the data security of devices within the factory by using authentication and message encryption.The proposed design is supposed to support OPC UA, Modbus, MQTT, and CoAP communication protocols to be suitable for applications needing conversion between industry standards, fieldbus protocols, and IoT communication protocols. All design goals of the IIoT gateway are realized in a single-board computer, Raspberry Pi B+. Through testing and verification, it is shown that the realized gateway can meet all goals. It can reduce the difficulty of integrating multiple systems, maintain the stability of linked devices, provide information systems with modeling capabilities, and increases device message delivering efficiency. The last but not the least, it mitigates the problems associated with the lack of security considerations of some protocols so that factory devices are protected from malicious attacks and confidential information is prevented from theft. | en_US |