隨著工業物聯網技術的興起，在大型物聯網系統中，傳統點對點 (Point-to-Point) 的網路傳輸容易讓系統變成複雜的結構體系。因此，使用 Publishe/Subscribe 的通訊架構能夠減少系統的複雜度，而且易於設計與維護龐大的物聯網系統。Object Management Group (OMG) 提出基於 Publishe/Subscribe 通訊架構的 Data Distribution Serivce (DDS) 標準，它提供豐富的 QoS 策略，能夠針對不同情境的系統進行配置。但是由於 QoS 策略的複雜性導致容易錯誤地調整其參數，造成設備無法正常通訊的情況，也無法容易地調校系統的效能。 故本研究為基於 DDS 通訊協定提出一套模擬平台，為了降低調校 QoS 策略的門檻，該平台能夠藉由一個基於 YAML 的 DDS 系統描述語言設定通訊架構，並且驗證 QoS 策略的一致性與相容性同時降低設定 QoS 策略錯誤的機率。此外，基於 DDS模擬的效能報告，提供效能 Reliability 與 Timeliness 的 QoS 策略優化建議，藉此提升 DDS 系統的效能。 ;With the rise of industrial Internet of Things technology, in large-scale Internet of Things systems, traditional point-to-point network transmission is easy to make the system into a complex relationship. Therefore, using the publisher/subscriber communication architecture can reduce the complexity of the system, and it is easy to design and maintain a huge IoT system. Object Management Group (OMG) proposes the Data Distribution Serivce (DDS) standard based on the publish/subscribe communication architecture, which provides rich QoS policies and can be configured for systems in different scenarios. However, due to the complexity of the QoS policy, it is easy to adjust its parameters incorrectly, resulting in the situation that the device cannot communicate normally, and the performance of the system cannot be easily adjusted. Therefore, this study proposes an emulation platform based on the DDS communication protocol. In order to lower the threshold for tuning QoS policies, the platform can set the communication architecture through a YAML-based DDS system description and verify the consistency and compatibility of QoS policies. At the same time reduce the probability of setting QoS policy error. In addition, based on the performance report of DDS emulation, it provides recommendations for QoS policies optimization of performance Reliability and Timeliness, thereby improving the performance of the DDS system.
