【安信可NB-IoT开发板EC-01F-Kit】二、TCP连接与NATAPP内网穿透
<div class='showpostmsg'><h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="黑体">今天测试下</font><font face="Arial">TCP</font><font face="黑体">连接与数据收发</font></span></span></span></span></strong></h6><h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="Arial">1.</font><font face="黑体">首先发送几个基本的</font><font face="Arial">AT</font><font face="黑体">指令注册并激活网络连接：</font></span></span></span></span></strong></h6>
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<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"> </span></strong></h6>
<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="Arial">2.</font><font face="黑体">接下来就</font><font face="Arial">ping</font><font face="黑体">下百度：</font></span></span></span></span></strong></h6>
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<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"> </span></strong></h6>
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<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"> </span></strong></h6>
<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="黑体">左边是我的电脑接的网线，右边是模组，差的还是挺大的，不过我们应用的是物联网小速率传输可以了。</font></span></span></span></span></strong></h6>
<p style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="黑体">3.现在正式创建</font><font face="Arial">TCP</font><font face="黑体">连接：</font></span></span></span></span></strong></p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">①</font></span></span><span style="font-family:Arial"><span style="color:#000000">AT+SKTCREATE </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">创建</font></span></span><span style="font-family:Arial"><span style="color:#000000">Socket </span></span></span></span></strong></p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">该命令会在</font> </span></span><span style="font-family:Arial"><span style="color:#000000">UE </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">端创建一个基于</font> </span></span><span style="font-family:Arial"><span style="color:#000000">TCP </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">或者</font> </span></span><span style="font-family:Arial"><span style="color:#000000">UDP </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">的</font> </span></span><span style="font-family:Arial"><span style="color:#000000">socket</span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">。</font></span></span><span style="font-family:Arial"><span style="color:#000000">UE </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">支持最多同时创建</font> </span></span><span style="font-family:Arial"><span style="color:#000000">7 </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">个</font> </span></span><span style="font-family:Arial"><span style="color:#000000">TCP </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">或者</font></span></span><span style="font-family:Arial"><span style="color:#000000">UDP socket</span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">，超出会返回如果发生错误</font></span></span></span></span></strong></p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">我们选择</font>IPV4,TCP协议：</span></span></span></span></strong></p>
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<p style="text-align:justify"> </p>
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<p style="text-align:left"><strong><span style="font-size:24px;"> <span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">连续创建会返回对应</font></span><span style="font-family:Arial"><span style="color:#000000">Socket</span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">文件描述符</font></span></span></span></span></strong></p>
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<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">②</font></span></span><span style="font-family:Arial"><span style="color:#000000">AT+SKTCONNECT </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">连接远程服务器和端口</font> </span></span></span></span></strong></p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">对于</font> </span></span><span style="font-family:Arial"><span style="color:#000000">TCP, </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">该命令将会执行连接到远程服务器地址和端口。</font> </span></span></span></span></strong></p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">对于</font></span></span><span style="font-family:Arial"><span style="color:#000000">UDP</span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">，该命令将会保存远程服务器的地址和端口号，用于后续数据的发送。</font> </span></span></span></span></strong></p>
<p style="text-align:left"> </p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">利用安信可提供的服务器连接服务器：</font></span></span></span></span></strong></p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span class="15"><span style="background:#ffffff"><span style="font-family:Arial"><span style="color:#4d4d4d"><span style="letter-spacing:0.0000pt"><span style="font-weight:bold"><span style="font-style:normal"><font face="Arial">安信可透传云</font></span></span></span></span></span><span style="font-family:宋体"><span style="color:#4d4d4d"><span style="letter-spacing:0.0000pt"><span style="font-weight:bold"><span style="font-style:normal"><font face="宋体">：</font></span></span></span></span></span></span></span><a href="http://tt.ai-thinker.com:8000/ttcloud"><u><span class="16"><span style="font-family:宋体"><span style="color:#0000ff"><span style="text-decoration:underline">http://tt.ai-thinker.com:8000/ttcloud</span></span></span></span></u></a></span></span></strong></p>
<p style="text-align:left"> </p>
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<p style="text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
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<h2 style="margin-top:5px; margin-bottom:8px; text-indent:0.0000pt; padding:0pt 0pt 0pt 0pt ; text-align:left"><strong><span style="font-size:24px;"><span style="background:#ffffff"><span style="font-family:宋体"><span style="font-weight:bold"><span style="font-family:宋体"><span style="font-weight:bold"><font face="宋体">要注意：</font></span></span><span style="background:#f7f7f7"><span style="font-family:'Segoe UI'"><span style="letter-spacing:0.0000pt"><span style="font-weight:bold"><span style="font-style:normal">3分钟内无客户端接入</span></span></span></span><span style="font-family:宋体"><span style="letter-spacing:0.0000pt"><span style="font-weight:bold"><span style="font-style:normal"><font face="宋体">要</font></span></span></span></span><span style="font-family:'Segoe UI'"><span style="letter-spacing:0.0000pt"><span style="font-weight:bold"><span style="font-style:normal"><font face="Segoe UI">刷新重新开启</font></span></span></span></span></span></span></span></span></span></strong></h2>
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<p style="text-align:justify"><strong><span style="font-size:24px;"> </span></strong></p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">③</font></span></span><span style="font-family:Arial"><span style="color:#000000">AT+SKTSTATUS </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">获取</font></span></span><span style="font-family:Arial"><span style="color:#000000">socket </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">状态</font> </span></span></span></span></strong></p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">该命令获取相应文件描述符的</font> </span></span><span style="font-family:Arial"><span style="color:#000000">socket </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">状态</font></span></span></span></span></strong></p>
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<p style="text-align:justify"> </p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">表示已经连接上</font></span></span></span></strong></p>
<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="黑体">接收数据：</font></span></span></span></span></strong></h6>
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<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"> </span></strong></h6>
<p class="imagemiddle" style="text-align: center;"></p>
<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"> </span></strong></h6>
<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="黑体">不过接收的是</font><font face="Arial">16</font><font face="黑体">进制还要转</font><font face="Arial">ascii</font><font face="黑体">才行。</font></span></span></span></span></strong></h6>
<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="黑体">发送数据：</font></span></span></span></span></strong></h6>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">④</font></span></span><span style="font-family:Arial"><span style="color:#000000">AT+SKTSEND </span></span><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">发送数据</font> </span></span></span></span></strong></p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><span style="color:#000000"><font face="宋体">发送一定长度的数据到远程服务器地址和端口中。</font></span></span></span></span></strong></p>
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<p style="text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="Arial">4.</font><font face="黑体">利用</font><font face="Arial">NATAPP</font><font face="黑体">内网穿透进行本地电脑与模块</font><font face="Arial">TCP</font><font face="黑体">通信</font><font face="Arial">:</font></span></span></span></span></strong></h6>
<h6 style="margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="黑体">就是将我们本地电脑局域网</font><font face="Arial">IP</font><font face="黑体">（</font><font face="Arial">192.168.0.x</font><font face="黑体">）映射到公网</font><font face="Arial">IP</font><font face="黑体">上</font></span></span></span></span></strong></h6>
<h6 style="text-indent:21.0000pt; margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="黑体">上文我们用安信可透传云实现电脑和模块通信，实际上是别人的网页，而且端口号刷新完会改变，现在我们要实现本地电脑和模块通信。</font></span></span></span></span></strong></h6>
<h6 style="text-indent:21.0000pt; margin-top:16px; margin-bottom:4px; text-align:left"><strong><span style="font-size:24px;"><span style="132%"><span style="font-family:Arial"><span style="font-family:黑体"><font face="黑体">因为</font><font face="Arial">192.168.x.x</font><font face="黑体">为局域网</font><font face="Arial">ip</font><font face="黑体">，路由器没办法转发这个</font><font face="Arial">ip</font><font face="黑体">的数据到</font><font face="Arial">intermet</font><font face="黑体">，所以不能直接和模块通信，所以我们要先建立一条局域网到公网的链路，内网穿透就是利用有固定公网 </font><font face="Arial">IP </font><font face="黑体">地址的服务器做一个中转站，在互联网上打通一条点对点的专用隧道用来转发数据。</font></span></span></span></span></strong></h6>
<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">我选择</font><font face="Calibri">NATAPP</font><font face="宋体">：</font></span><a href="http://natapp.cn/"><u><span class="16"><span style="font-family:宋体"><span style="color:#0000ff"><span style="text-decoration:underline"><font face="宋体">http://natapp.cn/</font></span></span></span></span></u></a></span></span></strong></p>
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<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
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<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
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<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
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<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
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<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">下载客户端：</font></span></span></span></strong></p>
<p style="text-indent:21.0000pt; text-align:left"> </p>
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<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">得到两个文件，进入</font><font face="Calibri">config</font><font face="宋体">文件：</font></span></span></span></strong></p>
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<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
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<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
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<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">启动穿透：</font></span></span></span></strong></p>
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<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">这样就建立了本地和公网</font><font face="Calibri">ip</font><font face="宋体">的链路</font></span></span></span></strong></p>
<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">因为模组连接</font><font face="Calibri">TCP</font><font face="宋体">要</font><font face="Calibri">IP</font><font face="宋体">，不能用域名，先域名解析：</font></span></span></span></strong></p>
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<p class="imagemiddle" style="text-align: center;"> </p>
<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> 如上文建立TCP连接：</span></strong></p>
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<p class="imagemiddle" style="margin-left: 40px;"><strong><span style="font-size:24px;">接收：</span></strong></p>
<p class="imagemiddle" style="text-align: center;"> </p>
<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> 发送：</span></strong></p>
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<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"> </span></strong></p>
<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">至此本地与模组</font><font face="Calibri">TCP</font><font face="宋体">通信完成！！</font></span></span></span></strong></p>
<p style="text-indent:21.0000pt; text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">不过这个NATAPP端口还是会改变，毕竟是免费的，有条件可以租个服务器和公网ip就有固定的端口了。</font></span></span></span></strong></p>
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