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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203
第十三章
藍牙無線傳輸
當人們聽到
藍牙
（
Bluetooth
）一詞，通常會先想到無線耳機、喇叭、電腦滑鼠或鍵盤，
但這些東西都跟網際網路沒關係，對吧？嗯，至少第一眼看起來確是如此。然而，如果
靠近一點仔細瞧瞧的話，將會發現藍牙技術可在網路裝置領域佔有一席之地。
使用 WiFi 傳輸資料時，惱人的障礙之一是需要設定網路連線組態，通常以手動方式完
成，選擇無線網路、輸入密碼等步驟，種種障礙，都會拖累連線裝置的設計與開發，影
響使用體驗。而在這一方面，藍牙技術擁有相當高的潛力，可輕易進入連線系統的領
域，靠著藍牙無線傳輸技術，你就能直接連接各個裝置，跳過網路組態的設定動作，也
不需要有一台網路路由器。你可打造出較為聰明的閘道器，根據所處位置或情境，提供
小型資料包裹，滿足所需。
低功耗藍牙通訊協定
目前廣為使用的藍牙技術有兩種：其一為高頻寬藍牙，已大量用於無線耳機，另一個
則是較新版的低功耗藍牙（Bluetooth Low Energy, BLE），也稱為智慧藍牙與藍牙 4.0
版。請注意不要被相似的名稱矇騙，這兩套通訊協定「完全不同」（
https://tessel.io/
blog/94173952967/you-probablydont-need-an-ibeacon
）。都可用於建構「智慧」裝置，但
BLE 因其耗電量極低，更常見於物聯網應用專案。底下列出幾個以藍牙技術為基礎的物
聯網應用功能：
• 藍牙技術可用於尋找並辨識周遭的裝置與服務，像是從實體物件發出的資料。運用
這份從某處取得的資料，我們可讓四周環境的資訊變得更為明顯∕視覺化∕明確 ...
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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.