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【小程序】小程序?小故事(11)——低功耗藍(lán)牙能力
時間：2018-07-26 14:52:24
文章發(fā)布：杜凱
原創(chuàng)作者：思程
來源： 微信開發(fā)者

在無線通信領(lǐng)域，藍(lán)牙是最基礎(chǔ)又常用的能力。藍(lán)牙組網(wǎng)十分簡單，兩設(shè)備間做個配對就可以建立起連接，其通信距離理論值為10米至100米以內(nèi)，是近距離通信應(yīng)用場景所喜愛的。今天我們想跟大家分享小程序連接藍(lán)牙的能力。




目前藍(lán)牙最為普遍的兩種規(guī)格為藍(lán)牙基礎(chǔ)率/增強數(shù)據(jù)率 (BR/EDR) 和低功耗 (LE) 藍(lán)牙。


藍(lán)牙基礎(chǔ)率/增強數(shù)據(jù)率 (BR/EDR) 是經(jīng)典的藍(lán)牙協(xié)議，常用在對數(shù)據(jù)傳輸帶寬有一定要求的場景上，比如需要傳輸音頻數(shù)據(jù)的藍(lán)牙音箱等；


低功耗 (LE) 藍(lán)牙是從藍(lán)牙4.0起支持的協(xié)議，特點就是耗電極低、傳輸速度更快，常用在對續(xù)航要求較高且只需小數(shù)據(jù)量傳輸的各種智能電子產(chǎn)品中，包括心率監(jiān)測儀器、體溫計、血糖儀、智能穿戴設(shè)備、胎壓監(jiān)測和電子煙等等，應(yīng)用場景廣泛，所以小程序在很早的版本（基礎(chǔ)庫 1.1.0）就優(yōu)先支持了低功耗藍(lán)牙能力。


我們在開發(fā)基于低功耗藍(lán)牙接口的小程序時，需要先理解一下藍(lán)牙在連接和通信過程中的一些概念。


工作模式


低功耗藍(lán)牙協(xié)議給設(shè)備定義了若干角色，其中最主要的角色是：外圍設(shè)備（Peripheral）與中心設(shè)備（Central）。


1

外圍設(shè)備是用來提供數(shù)據(jù)，通過不停地向外廣播數(shù)據(jù)，讓中心設(shè)備發(fā)現(xiàn)自己。


2

中心設(shè)備會掃描外圍設(shè)備，發(fā)現(xiàn)有外圍設(shè)備存在后，可以與之建立連接，之后就可以使用外圍設(shè)備提供的服務(wù)（Service）。一般而言，手機會擔(dān)任中心設(shè)備的角色，利用外圍設(shè)備提供的數(shù)據(jù)進(jìn)行處理或展示等等。因此，小程序提供低功耗藍(lán)牙接口是默認(rèn)設(shè)定手機為中心設(shè)備的。


通信協(xié)議


在兩個藍(lán)牙設(shè)備建立連接之后，雙方的數(shù)據(jù)交互是基于一個叫做 GATT (Generic Attribute Profile) 的規(guī)范，根據(jù)該規(guī)范可以定義出一個個配置文件（Profile），描述該藍(lán)牙設(shè)備提供的服務(wù)（Service）。


在整個通信過程中，有三個最主要的概念：配置文件（Profile）、服務(wù)（Service）、特性（Characteristic）。


1

Profile 并不真實存在于藍(lán)牙設(shè)備中，它只是被藍(lán)牙標(biāo)準(zhǔn)預(yù)先定義的一些 Service 的集合，如果藍(lán)牙設(shè)備之間要相互兼容，它們只要支持相同的 Profile 即可。一個藍(lán)牙設(shè)備可以支持多個 Profile。


2

Service 可以理解為藍(lán)牙設(shè)備提供的服務(wù)，一個設(shè)備可以提供多個服務(wù)，比如電量信息服務(wù)、系統(tǒng)信息服務(wù)等。每個 Service 又包含多個 Characteristic 特性值，比如電量信息服務(wù)就會有個 Characteristic 表示電量數(shù)據(jù)，同時還會有一個 16bit 或 128bit 的 UUID 標(biāo)識該服務(wù)，像微信硬件平臺的藍(lán)牙智能燈的主服務(wù) UUID 為 0xFEE7。16 bit 的 UUID 實際上是 128 bit 的縮短版，接收方收到后會補上藍(lán)牙的 UUID 基數(shù)，目的是為了提高傳輸效率。


3

Characteristic 是在 GATT 規(guī)范中最小的邏輯數(shù)據(jù)單元，由一個 value 和多個描述特性的 Desciptor 組成。實際上，在與藍(lán)牙設(shè)備打交道，主要就是通過讀寫 Characteristic 的 value 完成。同樣的，Characteristic 也是通過一個 16bit 或 128bit 的 UUID 。


總結(jié)一下，如下圖所示，我們可以簡單地理解為：每個藍(lán)牙設(shè)備可能提供多個 Service，每個 Service 可能有多個 Characteristic，我們根據(jù)藍(lán)牙設(shè)備的協(xié)議用對應(yīng)的 Characteristic 進(jìn)行讀寫即可達(dá)到與其通信的目的。



在理解了上面的模式和概念后，接下來我們看看如何可以使用小程序提供的藍(lán)牙接口。


Step 1 ：掃描并發(fā)現(xiàn)藍(lán)牙外圍設(shè)備

掃描并發(fā)現(xiàn)藍(lán)牙外設(shè)。如果藍(lán)牙功能未開啟，可監(jiān)聽藍(lán)牙狀態(tài)變化以便自動進(jìn)入下一步，提升用戶體驗。



Step 2 ：連接藍(lán)牙外圍設(shè)備

若之前連接過某個設(shè)備，可跳過掃描步驟，直接傳入 deviceId 連接。



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