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<h3 id="硬件原理图"><a href="#硬件原理图" class="headerlink" title="硬件原理图"></a>硬件原理图</h3><p>PCF8576原理图如图所示，与STM32F2接口为I2C，其中段码屏EDC190为静态动屏，PIN1与PIN40共用COM引脚，S0~S31共32段SEG。驱动芯片PC8576采用5V供电VDD，中间连接电位器来调节VLCD使其达到段码屏的额定供电电压，OSC接地表示使用内部时钟，A0~A2接地表示I2C地址为0x70，SA0接地表示唯一的从机地址为0x70。<br> <img src="https://ws1.sinaimg.cn/large/46a3f912ly1frjv05c6d6j20my0ivwhy.jpg" alt="Schematic" title="PCF8576原理图"><br> 这样的原理图有个明显的问题，段码屏的SEG没有按照PCF8576的ram存储方式进行排序，编程起来会比较麻烦。<br>
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<a class="post-title-link" href="/2018/04/09/wolfSSL-wolfMQTT/" itemprop="url">wolfSSL & wolfMQTT</a></h1>
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<p>新项目要求底端MSP430设备使用MQTT-TLS加密方式传输，Google后搜到一个叫做wolfSSL和wolfMQTT的开源库。</p>
<h2 id="wolfSSL-amp-wolfMQTT-介绍"><a href="#wolfSSL-amp-wolfMQTT-介绍" class="headerlink" title="wolfSSL & wolfMQTT 介绍"></a>wolfSSL & wolfMQTT 介绍</h2><h3 id="wolfSSL-Embedded-SSL-Library"><a href="#wolfSSL-Embedded-SSL-Library" class="headerlink" title="wolfSSL Embedded SSL Library"></a>wolfSSL Embedded SSL Library</h3><h4 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h4><p>wolfSSL嵌入式SSL库是一个用ANSI C编写的轻量级SSL / TLS库，针对嵌入式，RTOS和资源受限的环境 - 主要是因为它的体积小，速度快，功能集小。它通常在标准操作环境中使用，因为其免版税的价格和卓越的跨平台支持。wolfSSL支持高达当前TLS 1.2和DTLS 1.2级别的行业标准，比OpenSSL小20倍，并提供ChaCha20，Curve25519，NTRU和Blake2b等渐进式密码。在使用wSSSSL而不是OpenSSL时，用户基准测试和反馈报告的性能显着提升。</p>
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<li>小尺寸：20-100kB</li>
<li>运行时内存：1-36kB</li>
<li>比OpenSSL小20倍
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<h2 id="那些证书相关的玩意儿-SSL-X-509-PEM-DER-CRT-CER-KEY-CSR-P12等"><a href="#那些证书相关的玩意儿-SSL-X-509-PEM-DER-CRT-CER-KEY-CSR-P12等" class="headerlink" title="那些证书相关的玩意儿(SSL,X.509,PEM,DER,CRT,CER,KEY,CSR,P12等)"></a>那些证书相关的玩意儿(SSL,X.509,PEM,DER,CRT,CER,KEY,CSR,P12等)</h2><p>此文大部分转自于<a href="http://www.cnblogs.com/guogangj/p/4118605.html" target="_blank" rel="noopener">http://www.cnblogs.com/guogangj/p/4118605.html</a><br>作者『蒋国纲』，感谢。</p>
<p>之前没接触过证书加密的话,对证书相关的这些概念真是感觉挺棘手的,因为一下子来了一大堆新名词,看起来像是另一个领域的东西,而不是我们所熟悉的编程领域的那些东西,起码我个人感觉如此,且很长时间都没怎么搞懂.写这篇文章的目的就是为了理理清这些概念,搞清楚它们的含义及关联,还有一些基本操作.<br>
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<p>Paho_MQTT_C_Library库下几个比较重要的函数：<br>MQTTPacket.c<br><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">int MQTTPacket_sends(networkHandles* net, Header header, int count, char** buffers, size_t* buflens, int* frees);</span><br></pre></td></tr></table></figure></p>
<p>SSLScoket.c<br><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">int SSLSocket_putdatas(SSL* ssl, int socket, char* buf0, size_t buf0len, int count, char** buffers, size_t* buflens, int* frees)</span><br></pre></td></tr></table></figure></p>
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<p>git配置如下：<br><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">git config --global http.proxy <span class="string">'socks5://127.0.0.1:1080'</span></span><br><span class="line">git config --global https.proxy <span class="string">'socks5://127.0.0.1:1080'</span></span><br></pre></td></tr></table></figure></p>
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<h3 id="设计目的"><a href="#设计目的" class="headerlink" title="设计目的"></a>设计目的</h3><p>终端采用开放物联网MQTT-tls协议，实现安全认证和传输、订阅和发布。</p>
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<li>实现设备以MQTT-tls协议和MQTT代理服务器broker通讯</li>
<li>测试软件以MQTT-tls协议和MQTT代理服务器broker通讯</li>
<li>设备和测试软件通过发布订阅topic和自定的通讯协议互相通讯
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