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| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB用户手册 (In progress)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>开始</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>概述</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>服务器端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>客户端</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/Master/Client/Command Line Interface.html" class="sidebar-link">命令行接口(CLI)</a></li><li><a href="/zh/UserGuide/Master/Client/Programming - Native API.html" class="sidebar-link">原生接口</a></li><li><a href="/zh/UserGuide/Master/Client/Programming - JDBC.html" class="sidebar-link">JDBC</a></li><li><a href="/zh/UserGuide/Master/Client/Programming - Other Languages.html" class="sidebar-link">其他语言</a></li><li><a href="/zh/UserGuide/Master/Client/Programming - TsFile API.html" class="sidebar-link">TsFile API</a></li><li><a href="/zh/UserGuide/Master/Client/Programming - MQTT.html" class="active sidebar-link">MQTT</a></li><li><a href="/zh/UserGuide/Master/Client/Status Codes.html" class="sidebar-link">状态码</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>操作指南</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>生态集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统设计</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="mqtt协议"><a href="#mqtt协议" class="header-anchor">#</a> MQTT协议</h1> <p><a href="http://mqtt.org/" target="_blank" rel="noopener noreferrer">MQTT<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a>是机器对机器（M2M）/“物联网”连接协议。</p> <p>它被设计为一种非常轻量级的发布/订阅消息传递。</p> <p>对于与需要较小代码占用和/或网络带宽非常宝贵的远程位置的连接很有用。</p> <p>IoTDB支持MQTT v3.1（OASIS标准）协议。 |
| IoTDB服务器包括内置的MQTT服务，该服务允许远程设备将消息直接发送到IoTDB服务器。</p> <img src="https://user-images.githubusercontent.com/6711230/78357432-0c71cf80-75e4-11ea-98aa-c43a54d469ce.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> <h2 id="内置mqtt服务"><a href="#内置mqtt服务" class="header-anchor">#</a> 内置MQTT服务</h2> <p>内置的MQTT服务提供了通过MQTT直接连接到IoTDB的能力。 它侦听来自MQTT客户端的发布消息，然后立即将数据写入存储。 |
| MQTT主题与IoTDB时间序列相对应。 |
| 消息有效载荷可以由Java SPI加载的<code>PayloadFormatter</code>格式化为事件，默认实现为<code>JSONPayloadFormatter</code> |
| 默认的<code>json</code>格式化程序支持两种json格式，以下是MQTT消息有效负载示例：</p> <div class="language-json line-numbers-mode"><pre class="language-json"><code> <span class="token punctuation">{</span> |
| <span class="token property">"device"</span><span class="token operator">:</span><span class="token string">"root.sg.d1"</span><span class="token punctuation">,</span> |
| <span class="token property">"timestamp"</span><span class="token operator">:</span><span class="token number">1586076045524</span><span class="token punctuation">,</span> |
| <span class="token property">"measurements"</span><span class="token operator">:</span><span class="token punctuation">[</span><span class="token string">"s1"</span><span class="token punctuation">,</span><span class="token string">"s2"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| <span class="token property">"values"</span><span class="token operator">:</span><span class="token punctuation">[</span><span class="token number">0.530635</span><span class="token punctuation">,</span><span class="token number">0.530635</span><span class="token punctuation">]</span> |
| <span class="token punctuation">}</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>或者</p> <div class="language-json line-numbers-mode"><pre class="language-json"><code><span class="token punctuation">{</span> |
| <span class="token property">"device"</span><span class="token operator">:</span><span class="token string">"root.sg.d1"</span><span class="token punctuation">,</span> |
| <span class="token property">"timestamps"</span><span class="token operator">:</span><span class="token punctuation">[</span><span class="token number">1586076045524</span><span class="token punctuation">,</span><span class="token number">1586076065526</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| <span class="token property">"measurements"</span><span class="token operator">:</span><span class="token punctuation">[</span><span class="token string">"s1"</span><span class="token punctuation">,</span><span class="token string">"s2"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| <span class="token property">"values"</span><span class="token operator">:</span><span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token number">0.530635</span><span class="token punctuation">,</span><span class="token number">0.530635</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token number">0.530655</span><span class="token punctuation">,</span><span class="token number">0.530695</span><span class="token punctuation">]</span><span class="token punctuation">]</span> |
| <span class="token punctuation">}</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><img src="https://user-images.githubusercontent.com/6711230/78357469-1bf11880-75e4-11ea-978f-a53996667a0d.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> <h2 id="mqtt配置"><a href="#mqtt配置" class="header-anchor">#</a> MQTT配置</h2> <p>默认情况下，IoTDB MQTT服务从<code>${IOTDB_HOME}/${IOTDB_CONF}/iotdbengine.properties</code>加载配置。</p> <p>配置如下：</p> <table><thead><tr><th>名称</th> <th style="text-align:center;">描述</th> <th style="text-align:center;">默认</th></tr></thead> <tbody><tr><td>enable_mqtt_service</td> <td style="text-align:center;">是否启用mqtt服务</td> <td style="text-align:center;">false</td></tr> <tr><td>mqtt_host</td> <td style="text-align:center;">mqtt服务绑定主机</td> <td style="text-align:center;">0.0.0.0</td></tr> <tr><td>mqtt_port</td> <td style="text-align:center;">mqtt服务绑定端口</td> <td style="text-align:center;">1883</td></tr> <tr><td>mqtt_handler_pool_size</td> <td style="text-align:center;">处理mqtt消息的处理程序池大小</td> <td style="text-align:center;">1</td></tr> <tr><td>mqtt_payload_formatter</td> <td style="text-align:center;">mqtt消息有效负载格式化程序</td> <td style="text-align:center;">json</td></tr> <tr><td>mqtt_max_message_size</td> <td style="text-align:center;">mqtt消息最大长度（字节）</td> <td style="text-align:center;">1048576</td></tr></tbody></table> <h2 id="例子"><a href="#例子" class="header-anchor">#</a> 例子</h2> <p>以下是mqtt客户端将消息发送到IoTDB服务器的示例。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code> <span class="token class-name">MQTT</span> mqtt <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token function">MQTT</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| mqtt<span class="token punctuation">.</span><span class="token function">setHost</span><span class="token punctuation">(</span><span class="token string">"127.0.0.1"</span><span class="token punctuation">,</span> <span class="token number">1883</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| mqtt<span class="token punctuation">.</span><span class="token function">setUserName</span><span class="token punctuation">(</span><span class="token string">"root"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| mqtt<span class="token punctuation">.</span><span class="token function">setPassword</span><span class="token punctuation">(</span><span class="token string">"root"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token class-name">BlockingConnection</span> connection <span class="token operator">=</span> mqtt<span class="token punctuation">.</span><span class="token function">blockingConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| connection<span class="token punctuation">.</span><span class="token function">connect</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token class-name">Random</span> random <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Random</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">10</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token class-name">String</span> payload <span class="token operator">=</span> <span class="token class-name">String</span><span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span><span class="token string">"{\n"</span> <span class="token operator">+</span> |
| <span class="token string">"\"device\":\"root.sg.d1\",\n"</span> <span class="token operator">+</span> |
| <span class="token string">"\"timestamp\":%d,\n"</span> <span class="token operator">+</span> |
| <span class="token string">"\"measurements\":[\"s1\"],\n"</span> <span class="token operator">+</span> |
| <span class="token string">"\"values\":[%f]\n"</span> <span class="token operator">+</span> |
| <span class="token string">"}"</span><span class="token punctuation">,</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> random<span class="token punctuation">.</span><span class="token function">nextDouble</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| connection<span class="token punctuation">.</span><span class="token function">publish</span><span class="token punctuation">(</span><span class="token string">"root.sg.d1.s1"</span><span class="token punctuation">,</span> payload<span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token class-name">QoS</span><span class="token punctuation">.</span>AT_LEAST_ONCE<span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| |
| connection<span class="token punctuation">.</span><span class="token function">disconnect</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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