February 2015
Intermediate to advanced
200 pages
4h 48m
Japanese
Content preview from Bluetooth Low Energyをはじめよう
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013
複数の役割を並行して兼ね備えることのできる、さらに高度なデュアルモードとシングルモー
ドのデバイスが登場し始めている。これらのデバイスは同時に複数のコネクションに参加でき、
またアド バタイズを利 用してデータをブロードキャストすることもできる。
プロトコルとプロファイル
Bluetooth 規格では最初から、プ ロトコ ルとプ ロファイル の概念が明確に区別されて
いた。
• プ ロト コ ル
プ ロト コ ル は 、Bluetooth
規格に準拠するすべてのデバイスが利用するビルディングブロッ
クであり、ピア間で効率的にデータを送受信できるように、さまざまなパケットのフォーマッ
トやルーティング、多重化、エンコードやデコードが実装される層だ。
• プ ロファイル
プロファイルは、すべてのデバイスに要求される基本的な動作モード（汎用アクセス・プ
ロファイル 、汎 用 アトリビュート・プロファイル ）か 、特 定 の ユースケース（ 近 接 プ ロファイ
ル、ブドウ糖プロファイル）のどちらかをカバーする機能の「縦割り」であって、本質的に
は、一般的であれ具体的であれ、特定の目標を達成するためにプロトコルを利用する方
法を 定 義 するも の だ 。
図
1
-
5
混 合ト ポ ロジ ー
BR/EDR/LE
セ ント ラ ル
+
オブザーバ ー
+
BR/EDR マスター
BLEオブザーバー
混 合ト ポ ロ ジー
BLE ペリフェラ ル
BLE ペリフェラ ル
BLEブ ロード キャスター
BR/EDR スレーブ
BLE
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.