前言 · MQTT協議

**MQTT 版本3.1.1**# [OASIS](https://www.oasis-open.org/) 標準 2014年10月29日 **規格 URIs**## **當前版本:** http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.doc (Authoritative) http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.pdf **上一個版本:** http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/cos01/mqtt-v3.1.1-cos01.doc (Authoritative) http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/cos01/mqtt-v3.1.1-cos01.html http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/cos01/mqtt-v3.1.1-cos01.pdf **最新版本:** http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/mqtt-v3.1.1.doc (Authoritative) http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/mqtt-v3.1.1.html http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/mqtt-v3.1.1.pdf **技術委員會:** [OASIS Message Queuing Telemetry Transport (MQTT) TC](https://www.oasis-open.org/committees/mqtt/) **主席:** Raphael J Cohn (raphael.cohn@stormmq.com), 個人 Richard J Coppen (coppen@uk.ibm.com), IBM **作者:** Andrew Banks (Andrew_Banks@uk.ibm.com), IBM Rahul Gupta (rahul.gupta@us.ibm.com), IBM **相關工作:** 本規格和下面的工作相關: MQTT and the NIST Cybersecurity Framework Version 1.0. Edited by Geoff Brown and Louis-Philippe Lamoureux. Latest version: [http://docs.oasis-open.org/mqtt/mqtt-nist-cybersecurity/v1.0/mqtt-nist-cybersecurity-v1.0.html](http://docs.oasis-open.org/mqtt/mqtt-nist- cybersecurity/v1.0/mqtt-nist-cybersecurity-v1.0.html). **文摘:** MQTT客戶機服務器發布/訂閱消息傳輸協議。它是輕量級,開放,簡單,并被設計為容易實現的。這些特點使其適合使用在很多場景下, 包括受限的環境中,如在機器對機器通信 (M2M)和物聯網(物聯網)情況下,比如需要小的代碼空間或是網絡帶寬制約是首要制約因素。此協議運行在在TCP/IP上,或在其他提供有序、無損的雙向連接的網絡協議上。它的特性包括: * 使用發布/訂閱消息模式提供一對多的信息發布和應用解耦。 * 對負載內容屏蔽的消息傳輸機制。 * 三個級別的消息傳遞的服務質量: * “最多一次”,消息發布完全依賴于底層網絡協議。會發生消息丟失消息可能發生損失。這個級別的服務可以應用在比如環境傳感器數據, 水平可以被使用,例如,環境傳感器數據,因為很快會有下一次的數據發布,所以偶爾的數據丟失影響不大。 * “至少一次”,確保消息到達但可能會重復發生。 * “僅有一次”,確保消息到達又且僅有一次。這個級別可以應用在比如消息重復和丟失都不能被接受的計費系統中。 * 小的傳輸額外開銷和協議交換最小化從而降低網絡流量。 * 異常鏈接中斷時通知相關方的機制。 **狀態:** This document was last revised or approved by the membership of OASIS on the above date. The level of approval is also listed above. Check the “Latest version” location noted above for possible later revisions of this document. Any other numbered Versions and other technical work produced by the Technical Committee (TC) are listed at https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=mqtt#technical. TC members should send comments on this specification to the TC’s email list. Others should send comments to the TC’s public comment list, after subscribing to it by following the instructions at the “Send A Comment” button on the TC’s web page at https://www.oasis-open.org/committees/mqtt/. For information on whether any patents have been disclosed that may be essential to implementing this specification, and any offers of patent licensing terms, please refer to the Intellectual Property Rights section of the Technical Committee web page (https://www.oasis-open.org/committees/mqtt/ipr.php). **引文格式:** When referencing this specification the following citation format should be used: [mqtt-v3.1.1] MQTT Version 3.1.1. Edited by Andrew Banks and Rahul Gupta. 29 October 2014. 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