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CoreBluetooth系列教程(一):蓝牙连接流程 - 宋明的博客
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<h1 class="title">
CoreBluetooth系列教程(一):蓝牙连接流程
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<a href="http://apolla.cc">宋明</a>
<span style="color: #ccc;">|</span>
<span class="date"><i class="fa fa-calendar-check-o" aria-hidden="true"></i> 2023/03/18</span>
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<p>iOS系统中总共提供了4个框架用于实现蓝牙连接，分别如下：</p>
<blockquote>
<p>1.GameKit.framework(用法简单) 只能用于iOS设备之间的同个应用内连接,多用于游戏(如:棋牌类),从iOS7开始过期<br />
2.MultipeerConnectivity.framework(代替GameKit.framework) 只能用于iOS设备之间的连接,从iOS7开始引入,主要用于非联网状态下,通过wifi或者蓝牙进行文件共享(仅限于沙盒的文件),多用于附近无网聊天<br />
3.ExternalAccessory.framework(MFi) 可用于第三方蓝牙设备交互,但是蓝牙设备必须经过苹果MFi认证<br />
4.CoreBluetooth.framework（常用 Apple推行蓝牙的核心)可用于第三方蓝牙设备交互,必须要支持蓝牙4.0。硬件至少是4s,系统至少是iOS6。蓝牙4.0以低功耗著称,一般也叫BLE（Bluetooth Low Energy）</p>
</blockquote>
<p>关联使用的框架有HealthKit、HomeKit、wathOS、iBeacon。现在厂商主要使用蓝牙做自家智能硬件产品，如跑步机、蓝牙音箱、蓝牙车锁等。蓝牙上限传输是20字节，蓝牙传输上限是20字节 所以大数据传输会涉及到拆包、拼包、校验等。</p>
<h4><a id="%E8%93%9D%E7%89%99%E8%BF%9E%E6%8E%A5%E6%B5%81%E7%A8%8B" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>蓝牙连接流程</h4>
<blockquote>
<p>1.建立设备管理者<br />
2.扫描设备<br />
3.连接设备<br />
4.扫描设备的服务<br />
5.扫描设备中的特征<br />
6.订阅或读取设备特征值<br />
7.获取设备中的数据或将数据写入设备</p>
</blockquote>
<p>CenterManager 扫描链接外设成功后 启动一个Peripheral外设管理对象 负责外设数据的操作处理</p>
<blockquote>
<p>1.启动一个Peripheral外设管理对象 负责设备数据的操作处理<br />
2.扫描设备中的服务和特征(Discover Services And Characteristics)<br />
3.获取设备的services （基本服务(电池信息和设备信息)、硬件自定服务）<br />
4.Discover指定Service下的特征 获取的Characteristics,<br />
5.通过指定特征( Characteristics)订阅(Notiy)/读取(Read)/写入(Write) 等操作<br />
6.获取Characteristics的Descriptor和Descriptor的值 复制代码</p>
</blockquote>
<p>Characteristics是蓝牙数据传输操作的做小单元。蓝牙通信里的服务和特征是指每个设备都会有1个或多个服务，每个服务里都会有1个或多个特征。而特征就是具体的键值对，提供数据的地方，每个特征属性分为:读、写、通知等等。 下一篇会讲代码具体的实现。</p>
<p>作者：卢叁<br />
链接：<a href="https://juejin.cn/post/7179495998262083641">https://juejin.cn/post/7179495998262083641</a><br />
来源：稀土掘金<br />
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。</p>
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