政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/141639

政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/141639

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政大典藏 > College of Informatics > Department of Computer Science > Theses > Item 140.119/141639

Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/141639

Title:	MQTT端點到端點間的訊息確保送達機制 An End-to-End Exactly-Once Message Delivery Extension for MQTT
Authors:	廖宇凡 Liao, Yu-Fan
Contributors:	廖峻鋒 Liao, Chun-Feng 廖宇凡 Liao, Yu-Fan
Keywords:	物聯網 MQTT 服務品質 Internet of Things MQTT QoS
Date:	2022
Issue Date:	2022-09-02 15:05:06 (UTC+8)
Abstract:	近年來物聯網相關技術快速發展，硬體成本不斷的降低，大量感測器（Sensors）與致動器（Actautors）在生活中被使用，這些感測器能將環境中的相關資訊透過較輕量的傳輸協定發送到擁有足夠運算能力的主機，再藉由主機中的邏輯去推動制動器做相應的動作或是通知使用者關切的訊息。其中， MQTT（Message Queuing Telemetry Transport）協定是目前被廣泛使用的物聯網通訊協定。目前 MQTT 雖然能提供 QoS (Quality of Service) 依照使用情境動態調整訊息傳送品質以增進效能。其中， QoS-1雖可確保訊息送達，然而訊息可能重覆傳送，而QoS-2 能做到保證訊息送達恰好一次。但QoS-2的保證送達語意容易造成開發人員誤解，因為其保證送達僅限於端點與Broker之間的傳輸，但開發人員通常預期為端點至端點的傳輸，有鑑於此，本研究提出QoS-2的改進機制，在與MQTT5.0 規格相容的前提下，設計端點到端點的確保送達機制，並讓發送端與接收端能夠以自身需求配置參數，達到更有效率的溝通，並實作一個合規的MQTT Broker 來驗證正確性，最後也將透過一系列的效能實驗檢驗此設計所產生的效能影響。 With the reduction of hardware production costs in recent years, the influence of IoT and related technologies is expanding rapidly. In an IoT-enabled smart environment, a considerable amount of sensors and actuators are utilized in everyday lives. The sensors take advantage of specialized protocols, which transport information to edge servers. The edge server then performs corresponding actions or notifies the user through messages based on the received data. Among the specialized transportation protocols, MQTT (Message Queuing Telemetry Transport) is one of the most widely utilized protocols. MQTT provides Quality of Service (QoS), which dynamically adjusts the quality of the message to enhance performance. QoS-1 ensures that message is delivered at least once at the cost of duplicating messages. As QoS-2 guarantees, the message is received only once by the recipient. However, the promise of QoS-2 can be misleading to developers; since the assurance is limited to the scope of node-broker, not node-broker-node (end-to-end). Based on this observation, this thesis aims to investigate enhancement strategies to realize end-to-end guarantee delivery; with the compatibility of MQTT 5.0. The proposed design is flexible in that both the receiver and sender can customize the transportation quality based on their needs in a non-invasive way and is compatible with other MQTT clients at the same time. A prototype of the enhanced MQTT broker is implemented to verify the functions of the proposed enhancement. Finally, a series of experiments are conducted to investigate the performance of the design.
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Description:	碩士國立政治大學資訊科學系 107753014
Source URI:	http://thesis.lib.nccu.edu.tw/record/#G0107753014
Data Type:	thesis
DOI:	10.6814/NCCU202201378
Appears in Collections:	[Department of Computer Science ] Theses

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