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Rata（EDR），传输率约在1.8M/s~2.1M/s，开始支持双工模式； </span></p><p><span style="font-family: 微软雅黑; color: rgb(82, 137, 186); font-size: 18px;">蓝牙 3.0：引入全新的交替射频技术(AMP: Alternate MAC/PHY)，传输率提高到了大约24Mbps； </span></p><p><span style="font-size: 18px; font-family: 微软雅黑; color: rgb(82, 137, 186);">蓝牙 4.0：是第一个综合性规范，加入了全新的蓝牙低功耗技术，即蓝牙 4.0 集三种规格于一体（ BR/EDR 和BLE ），最重要的特点就是省电，可以使一粒纽扣电池连续工作数年； 蓝牙 4.2：提升了 BLE 数据传输速度，支持长包传输，单个数据包最大可传输 255 个字节，同时改善了隐私保护程 度；</span></p><p><span style="font-family: 微软雅黑; color: rgb(82, 137, 186); font-size: 18px;">蓝牙 5.0：相对于蓝牙 4.2，具有 2 倍的数据速率、4 倍的覆盖范围和 8 倍的广播能力。</span></p><p><span style="font-weight: bold; font-family: 微软雅黑; color: rgb(82, 137, 186); font-size: 18px;">优势：</span></p><p><span style="font-family: 微软雅黑; color: rgb(82, 137, 186); font-size: 18px;"><span style="font-family: Wingdings; color: rgb(82, 137, 186);">u</span><span style="font-family: 微软雅黑; color: rgb(82, 137, 186);">蓝牙的用户基础相当广泛，手机、电脑、音响、车载、穿戴等音频和数传设备，智能家设备主要采用低 功耗蓝牙4.0及以上标准协议，如手环、健康秤等，以及支持BLE Mesh协议，如智能插座、灯具、传感 器、小家电等，利用语音音响作为网关，语音配网更加简单方便； </span></span></p><p><span style="font-family: 微软雅黑; color: rgb(82, 137, 186); font-size: 18px;"><span style="font-family: Wingdings; color: rgb(82, 137, 186);">u</span><span style="font-family: 微软雅黑; color: rgb(82, 137, 186);">低功耗是蓝牙技术的一大优点，这一优点在蓝牙Mesh技术当中也得以继承。 在蓝牙Mesh网络中有一类节点支持低功耗特性(Low Power Feature) ； </span></span></p><p><span style="font-family: 微软雅黑; color: rgb(82, 137, 186); font-size: 18px;">u<span style="font-family: Wingdings; color: rgb(82, 137, 186);"></span>蓝牙模组成本较低。虽然当前种种协议模块成本都在下降，如Zigbee模块、 Wi-Fi模块等，但相比较而言，蓝牙模块平均成本相对较低； </span></p><p><span style="font-family: 微软雅黑; color: rgb(82, 137, 186); font-size: 18px;"><span style="font-family: Wingdings; color: rgb(82, 137, 186);">u</span><span style="font-family: 微软雅黑; color: rgb(82, 137, 186);">较高安全性：使用AES－128 CCM加密算法进行数据包加密和认证； </span></span></p><p><span style="font-weight: bold; font-family: 微软雅黑; color: rgb(82, 137, 186); font-size: 18px;">劣势：</span></p><p><span style="font-family: 微软雅黑; color: rgb(82, 137, 186); font-size: 18px;"><span style="font-family: Wingdings; color: rgb(82, 137, 186);">p </span>由于蓝牙无线路由设备缺失，需要专门的网关或者智能音响来作为接入，否则无法直接连接互联网，实 现远程操控； </span></p><p><span style="font-family: 微软雅黑; color: rgb(82, 137, 186); font-size: 18px;"><span style="font-family: Wingdings; color: rgb(82, 137, 186);">p </span><span style="font-family: 微软雅黑; color: rgb(82, 137, 186);">蓝牙Mesh协议栈功能还不完善，比如蓝牙Mesh中的低功耗节点和朋友节点绝大部分厂商都没有做好， 蓝牙Mesh 不支持路由。另外蓝牙Mesh有一个非常好的特性：通过手机完成Mesh配网和部署，但大部 分厂商目前都没有推出相应的配网app及对应的库； </span></span></p><p><span style="font-family: 微软雅黑; color: rgb(82, 137, 186); font-size: 18px;"><span style="font-family: Wingdings; color: rgb(82, 137, 186);">p </span><span style="font-family: 微软雅黑; color: rgb(82, 137, 186); font-weight: bold;">蓝牙同样存在应用层标准难统一的问题，天猫精灵、百度、小米等Mesh标准互不兼容，针对智能家居行 业的标准化和互操作性较差</span></span></p> </div> <!--/mod-dc-text--> </div> <!--/mod-dc-class-wrap--> </div> </div> </div><div class="clearfix"><div class="widget-wrap " 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