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    當前位置: 首頁 > 售后 > 藝源智庫
    【小程序】小程序?小故事(11)——低功耗藍牙能力
    時間:2018-07-26 14:52:24
    文章發布:杜凱
    原創作者:思程
    來源: 微信開發者

    在無線通信領域,藍牙是最基礎又常用的能力。藍牙組網十分簡單,兩設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,是近距離通信應用場景所喜愛的。今天我們想跟大家分享小程序連接藍牙的能力。




    目前藍牙最為普遍的兩種規格為藍牙基礎率/增強數據率 (BR/EDR) 和低功耗 (LE) 藍牙。


    藍牙基礎率/增強數據率 (BR/EDR) 是經典的藍牙協議,常用在對數據傳輸帶寬有一定要求的場景上,比如需要傳輸音頻數據的藍牙音箱等;


    低功耗 (LE) 藍牙是從藍牙4.0起支持的協議,特點就是耗電極低、傳輸速度更快,常用在對續航要求較高且只需小數據量傳輸的各種智能電子產品中,包括心率監測儀器、體溫計、血糖儀、智能穿戴設備、胎壓監測和電子煙等等,應用場景廣泛,所以小程序在很早的版本(基礎庫 1.1.0)就優先支持了低功耗藍牙能力。


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


    工作模式


    低功耗藍牙協議給設備定義了若干角色,其中最主要的角色是:外圍設備(Peripheral)中心設備(Central)。


    1

    外圍設備是用來提供數據,通過不停地向外廣播數據,讓中心設備發現自己。


    2

    中心設備會掃描外圍設備,發現有外圍設備存在后,可以與之建立連接,之后就可以使用外圍設備提供的服務(Service)。一般而言,手機會擔任中心設備的角色,利用外圍設備提供的數據進行處理或展示等等。因此,小程序提供低功耗藍牙接口是默認設定手機為中心設備的。


    通信協議


    在兩個藍牙設備建立連接之后,雙方的數據交互是基于一個叫做 GATT (Generic Attribute Profile) 的規范,根據該規范可以定義出一個個配置文件(Profile),描述該藍牙設備提供的服務(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(Service)、特性(Characteristic)。


    1

    Profile 并不真實存在于藍牙設備中,它只是被藍牙標準預先定義的一些 Service 的集合,如果藍牙設備之間要相互兼容,它們只要支持相同的 Profile 即可。一個藍牙設備可以支持多個 Profile。


    2

    Service 可以理解為藍牙設備提供的服務,一個設備可以提供多個服務,比如電量信息服務、系統信息服務等。每個 Service 又包含多個 Characteristic 特性值,比如電量信息服務就會有個 Characteristic 表示電量數據,同時還會有一個 16bit 或 128bit 的 UUID 標識該服務,像微信硬件平臺的藍牙智能燈的主服務 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牙的 UUID 基數,目的是為了提高傳輸效率。


    3

    Characteristic 是在 GATT 規范中最小的邏輯數據單元,由一個 value 和多個描述特性的 Desciptor 組成。實際上,在與藍牙設備打交道,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 。


    總結一下,如下圖所示,我們可以簡單地理解為:每個藍牙設備可能提供多個 Service,每個 Service 可能有多個 Characteristic,我們根據藍牙設備的協議用對應的 Characteristic 進行讀寫即可達到與其通信的目的。



    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牙接口。


    Step 1 :掃描并發現藍牙外圍設備

    掃描并發現藍牙外設。如果藍牙功能未開啟,可監聽藍牙狀態變化以便自動進入下一步,提升用戶體驗。



    Step 2 :連接藍牙外圍設備

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



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