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当前位置: 首页 > 售后 > 艺源智库
【小程序】小程序•小故事(11)——低功耗蓝牙能力
时间:2018-07-26 14:52:24
文章发布:杜凯
原创作者:思程
来源: 微信开发者

在无线通信领域,蓝牙是最基础又常用的能力。蓝牙组网十分简单,两设备间做个配对就可以建立起连接,其通信距离理论值为10米至100米以内,是近距离通信应用场景所喜爱的。今天我们想跟大家分享小程序连接蓝牙的能力。




目前蓝牙最为普遍的两种规格为蓝牙基础率/增强数据率 (BR/EDR) 和低功耗 (LE) 蓝牙。


蓝牙基础率/增强数据率 (BR/EDR) 是经典的蓝牙协议,常用在对数据传输带宽有一定要求的场景上,比如需要传输音频数据的蓝牙音箱等;


低功耗 (LE) 蓝牙是从蓝牙4.0起支持的协议,特点就是耗电极低、传输速度更快,常用在对续航要求较高且只需小数据量传输的各种智能电子产品中,包括心率监测仪器、体温计、血糖仪、智能穿戴设备、胎压监测和电子烟等等,应用场景广泛,所以小程序在很早的版本(基础库 1.1.0)就优先支持了低功耗蓝牙能力。


我们在开发基于低功耗蓝牙接口的小程序时,需要先理解一下蓝牙在连接和通信过程中的一些概念。


工作模式


低功耗蓝牙协议给设备定义了若干角色,其中最主要的角色是:外围设备(Peripheral)中心设备(Central)


1

外围设备是用来提供数据,通过不停地向外广播数据,让中心设备发现自己。


2

中心设备会扫描外围设备,发现有外围设备存在后,可以与之建立连接,之后就可以使用外围设备提供的服务(Service)。一般而言,手机会担任中心设备的角色,利用外围设备提供的数据进行处理或展示等等。因此,小程序提供低功耗蓝牙接口是默认设定手机为中心设备的。


通信协议


在两个蓝牙设备建立连接之后,双方的数据交互是基于一个叫做 GATT (Generic Attribute Profile) 的规范,根据该规范可以定义出一个个配置文件(Profile),描述该蓝牙设备提供的服务(Service)。


在整个通信过程中,有三个最主要的概念:配置文件(Profile)、服务(Service)、特性(Characteristic)。


1

Profile 并不真实存在于蓝牙设备中,它只是被蓝牙标准预先定义的一些 Service 的集合,如果蓝牙设备之间要相互兼容,它们只要支持相同的 Profile 即可。一个蓝牙设备可以支持多个 Profile。


2

Service 可以理解为蓝牙设备提供的服务,一个设备可以提供多个服务,比如电量信息服务、系统信息服务等。每个 Service 又包含多个 Characteristic 特性值,比如电量信息服务就会有个 Characteristic 表示电量数据,同时还会有一个 16bit 或 128bit 的 UUID 标识该服务,像微信硬件平台的蓝牙智能灯的主服务 UUID 为 0xFEE7。16 bit 的 UUID 实际上是 128 bit 的缩短版,接收方收到后会补上蓝牙的 UUID 基数,目的是为了提高传输效率。


3

Characteristic 是在 GATT 规范中最小的逻辑数据单元,由一个 value 和多个描述特性的 Desciptor 组成。实际上,在与蓝牙设备打交道,主要就是通过读写 Characteristic 的 value 完成。同样的,Characteristic 也是通过一个 16bit 或 128bit 的 UUID 。


总结一下,如下图所示,我们可以简单地理解为:每个蓝牙设备可能提供多个 Service,每个 Service 可能有多个 Characteristic,我们根据蓝牙设备的协议用对应的 Characteristic 进行读写即可达到与其通信的目的。



在理解了上面的模式和概念后,接下来我们看看如何可以使用小程序提供的蓝牙接口。


Step 1 :扫描并发现蓝牙外围设备

扫描并发现蓝牙外设。如果蓝牙功能未开启,可监听蓝牙状态变化以便自动进入下一步,提升用户体验。



Step 2 :连接蓝牙外围设备

若之前连接过某个设备,可跳过扫描步骤,直接传入 deviceId 连接。



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