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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Bluetooth Low Energyをはじめよう
GATT サ ー バ ー 中 の アト リビ ュ ート は サービスにグループ 化され 、それぞれのグループに
はゼロ個以上の特性が含まれる。これらの特性にはさらに、ゼロ個以上のディスクリプ タ
が含まれる。この階層構造はGATT 準拠を主張するあらゆるデバイス（基本的には市販さ
れる BLEデバイスすべて）へ厳密に適用される。つまり、GATT サーバー中のすべてのア
トリビュートは、一切の例外なく、これら3つのカテゴリーのいずれかに含まれるのだ。BLE
デバイス間のデータのやり取りはこの階層構造に依存しているため、階層構造の外で宙
ぶらりんになったアトリビュートは 存 在し得 ない 。
GATT 階層構造中の大部分の種類のデータについては、その定義（definition）（そ
れを構 成するアトリビュートのグループ全 体 ）と、宣言（declaration）とを 区 別 す ることが
大事だ。宣言は定義の中で常に（ハンドルの増加する順番で）最初に配置され、それ以
降のデータに関するメタデータの大部分を導入する。すべての宣言は読み出しのみのパー
ミッションを持ち、セキュリティは要求されない。宣言には機密性のあるデータが含まれる
可能性がないからだ。宣言は唯一の構造的アトリビュートであって、クライアントがサーバー
上のアトリビュートのレイアウトと性質を発見し、検索することを可能にする。
サービス
GATT のサービスは、GATT サーバー中の概念的 ...
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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.