August 2017
Intermediate to advanced
272 pages
5h 32m
Chinese
Content preview from Node.js物聯網裝置開發
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第十三章 藍牙無線傳輸
然後開始掃描（搜尋）你身邊附近的藍牙裝置：
# hcitool lescan
若是 Tessel 2，則不需要做任何特別的設定工作，只要插入 USB 介面的 BLE
模組，然後使用 Node 模組
noble
，如此即可，範例請見
http://tessel.github.io/t2-
start/modules/ble.html
。
許多智慧型手機也能扮演藍牙周邊裝置的角色，舉例而言，當你從智慧型手
錶操控手機上的音樂播放功能時，此時對於手錶來說，手機扮演的是周邊角
色。新近的手機也支援信標模式，可向外廣播自己的存在事實。在某些情況
下，受限於裝置所採用的藍牙晶片規格，並無法扮演周邊的角色。
另一種操作藍牙裝置的方式是透過網頁瀏覽器，經由新版的瀏覽器與藍牙 API，可搜尋
發現附近的信標。舉例而言，Opera 支援某些查詢規範的操作動作（
https://dev.opera.com/
articles/web-bluetooth-intro
），還有，Google Chrome 可讓你連接到某台裝置，並且查詢它
有哪些特徵（
https://developers.google.com/web/updates/2015/07/interact-with-ble-devices-on-
the-web?hl=en
）。
Beacon（信標）
beacon 會發出資料，諸如 ID 或其他屬性項，透過此種方式，告知附近的其他裝置某些
資訊。beacon 廣告資料的格式，具有特殊作用，各家廠商各不相同，最為知名的 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.