设备需要多种连接方式

从最简单的智能手机和音箱之间音频流传输的点对点连接,到实现机场导航服务的广播连接,再到支持大规模楼宇自动化的mesh连接,蓝牙Bluetooth®支持多种拓扑选项,最大程度地满足了全球不同开发者独特的无线连接需求。

点对点

点对点是用于建立一对一(1:1)设备通信的网络拓扑。蓝牙基础速率/ 增强资料速率(BR / EDR)的点对点拓扑针对音频流传输进行了优化,是音箱、耳机和免提车载配件等众多无线设备的理想之选。低功耗蓝牙(Bluetooth Low Energy)的点对点拓扑结构针对数据传输进行了优化,非常适合互联设备产品,如可穿戴智能设备、健康数据监测仪、笔记本电脑外设及电脑配件等。

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广播

广播是用于建立一对多(1:m)设备通信的网络拓扑。低功耗蓝牙的广播拓扑结构针对本地信息共享进行了优化,适用于提供地标信息、物品搜寻和导航等服务的Beacon解决方案。

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Mesh

Mesh是用于建立多对多(m:m)设备通信的网络拓扑。低功耗蓝牙的mesh拓扑能够创建定制化的大型设备网络,适用于楼宇自动化、传感器网络和资产追踪等需要让数以万计个设备在可靠、安全的环境下传输的解决方案。

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Bluetooth Low Energy (LE) Bluetooth Basic Rate/
Enhanced Data Rate (BR/EDR)
Point-to-Point (1:1 device communication)
Optimized For… Short burst data transmission Continuous data streaming
Setup time <6 ms 100 ms
Max connections/ device (piconet) Unlimited (implementation specific) 7
Data rate 125 Kb/s to 2 Mb/s 1 Mb/s to 3 Mb/s​
Max payload size 251 byte​ 1,021 byte​
Security 128-bit AES, user defined application layer​ 64b/128b, user defined application layer​
Service definition GATT Profiles​ Traditional Profiles​
Broadcast (1:m device communication)
Max payload size Primary Channel: 31 byte​
Secondary Channel: 255 byte​
Chaining of packets for larger messages
Not Applicable
Security User defined application layer
Service definition Beacon Formats
(not specified by Bluetooth SIG)​
Mesh (m:m device communication)
Max nodes 32,767 Not Applicable
Max subnets 4,096
Message addressing Unicast, Multicast, Broadcast​
Up to 16,384 group addresses​
Supports publish/subscribe addressing​
Message forwarding Managed flood
Max payload size 29 byte payload
Security 128-bit AES​
Device, network and application levels​
Service definition Mesh Models, Mesh Properties

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