github
/
designiot
mirror of https://github.com/phodal/designiot.git


			
				
					
						
						
							1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889
							<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <meta http-equiv="Content-Style-Type" content="text/css" />
  <meta name="generator" content="pandoc" />
  <title></title>
  <style type="text/css">code{white-space: pre;}</style>
  <style type="text/css">
div.sourceCode { overflow-x: auto; }
table.sourceCode, tr.sourceCode, td.lineNumbers, td.sourceCode {
  margin: 0; padding: 0; vertical-align: baseline; border: none; }
table.sourceCode { width: 100%; line-height: 100%; }
td.lineNumbers { text-align: right; padding-right: 4px; padding-left: 4px; color: #aaaaaa; border-right: 1px solid #aaaaaa; }
td.sourceCode { padding-left: 5px; }
code > span.kw { color: #007020; font-weight: bold; } /* Keyword */
code > span.dt { color: #902000; } /* DataType */
code > span.dv { color: #40a070; } /* DecVal */
code > span.bn { color: #40a070; } /* BaseN */
code > span.fl { color: #40a070; } /* Float */
code > span.ch { color: #4070a0; } /* Char */
code > span.st { color: #4070a0; } /* String */
code > span.co { color: #60a0b0; font-style: italic; } /* Comment */
code > span.ot { color: #007020; } /* Other */
code > span.al { color: #ff0000; font-weight: bold; } /* Alert */
code > span.fu { color: #06287e; } /* Function */
code > span.er { color: #ff0000; font-weight: bold; } /* Error */
code > span.wa { color: #60a0b0; font-weight: bold; font-style: italic; } /* Warning */
code > span.cn { color: #880000; } /* Constant */
code > span.sc { color: #4070a0; } /* SpecialChar */
code > span.vs { color: #4070a0; } /* VerbatimString */
code > span.ss { color: #bb6688; } /* SpecialString */
code > span.im { } /* Import */
code > span.va { color: #19177c; } /* Variable */
code > span.cf { color: #007020; font-weight: bold; } /* ControlFlow */
code > span.op { color: #666666; } /* Operator */
code > span.bu { } /* BuiltIn */
code > span.ex { } /* Extension */
code > span.pp { color: #bc7a00; } /* Preprocessor */
code > span.at { color: #7d9029; } /* Attribute */
code > span.do { color: #ba2121; font-style: italic; } /* Documentation */
code > span.an { color: #60a0b0; font-weight: bold; font-style: italic; } /* Annotation */
code > span.cv { color: #60a0b0; font-weight: bold; font-style: italic; } /* CommentVar */
code > span.in { color: #60a0b0; font-weight: bold; font-style: italic; } /* Information */
  </style>
  <link rel="stylesheet" href="css/vendor.css" type="text/css" />
</head>
<body>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:wb="http://open.weibo.com/wb" >
	<head>
		<title>一步步搭建物联网系统(教你设计物联网系统)</title>
		<meta name="keywords" content="设计物联网系统,物联网系统设计">
		<meta name="description" content="一份关于如何设计物联网系统的文档">
		<link rel="stylesheet" href="../css/vendor.css" />
	</head>
	<body class="container inner wrap">
		<h1>一步步搭建物联网系统(教你设计物联网系统)</h1>
	</body>
</html>
<div id="TOC">
<ul>
<li><a href="#mqtt"><span class="toc-section-number">1</span> MQTT</a><ul>
<li><a href="#nodejs-mqtt"><span class="toc-section-number">1.1</span> Nodejs MQTT</a></li>
</ul></li>
</ul>
</div>
<h1 id="mqtt"><span class="header-section-number">1</span> MQTT</h1>
<blockquote>
<p>MQTT（Message Queuing Telemetry Transport，消息队列遥测传输）是IBM开发的一个即时通讯协议，有可能成为物联网的重要组成部分。该协议支持所有平台，几乎可以把所有联网物品和外部连接起来，被用来当做传感器和致动器（比如通过Twitter让房屋联网）的通信协议。</p>
</blockquote>
<p>早在1999年，IBM的Andy Stanford-Clark博士以及Arcom公司ArlenNipper博士发明了MQTT（Message Queuing Telemetry Transport，消息队列遥测传输）技术[1] 。据Andy Stanford-Clark博士称，MQTT将在今年和明年呈现爆炸式增长。</p>
<h2 id="nodejs-mqtt"><span class="header-section-number">1.1</span> Nodejs MQTT</h2>
<blockquote>
<p><a href="https://github.com/adamvr/MQTT.js/">mqtt.js</a> is a library for the MQTT protocol, written in JavaScript to be used in node.js.</p>
</blockquote>
<div class="sourceCode"><pre class="sourceCode javascript"><code class="sourceCode javascript"><span class="kw">var</span> mqtt <span class="op">=</span> <span class="at">require</span>(<span class="st">&#39;mqtt&#39;</span>)

client <span class="op">=</span> <span class="va">mqtt</span>.<span class="at">createClient</span>(<span class="dv">1883</span><span class="op">,</span> <span class="st">&#39;localhost&#39;</span>)<span class="op">;</span>

<span class="va">client</span>.<span class="at">subscribe</span>(<span class="st">&#39;presence&#39;</span>)<span class="op">;</span>
<span class="va">client</span>.<span class="at">publish</span>(<span class="st">&#39;presence&#39;</span><span class="op">,</span> <span class="st">&#39;Hello mqtt&#39;</span>)<span class="op">;</span>

<span class="va">client</span>.<span class="at">on</span>(<span class="st">&#39;message&#39;</span><span class="op">,</span> <span class="kw">function</span> (topic<span class="op">,</span> message) <span class="op">{</span>
  <span class="va">console</span>.<span class="at">log</span>(message)<span class="op">;</span>
<span class="op">}</span>)<span class="op">;</span>

<span class="va">client</span>.<span class="at">end</span>()<span class="op">;</span></code></pre></div>
</body>
</html>