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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078
Bluetooth Low Energyをはじめよう
こ の セ クション の す べ て の 機 能 は 、オ ー プ ン な セ キ ュ ア で な い コ ネクション 上 で 行 うこと
ができる。検 索は、何の制 約もなくすべてのクライアントに許されているからだ。
特性とディスクリプタの読み出し
特性値またはディスクリプタの現在の値を取得する際、クライアントには以下の選択肢
がある。
• 特 性 値またはディスクリプタの 読 み出し
（Read characteristic value or descriptor）
この機能は、特性値またはディスクリプタの内容を、そのハンドルを用いて単純に読み
出すために使われる。内容の最初の
ATT_MTU
−
1
バイトの みを読 み 出 すことが できる。
これが応答パケットに収まるバイト数の最大値だからだ（1バ イト は ATT 操 作 コ ード の た
め に 予 約 さ れ て い る ）。
• 長い特性値またはディスクリプタの読み出し
（Read long characteristic value or descriptor）
先ほどの機能で読み出すには値が長すぎる場合、特性値またはディスクリプタの内容を
連 続するかたまりとして読み出すために、この機 能はハンドルのほかにオフセットを含め
て要求を行う。読み出されるアトリビュート値の長さに応じて、複数回の要求／応答ペ
アが 必 要となる 。
さらに、特性値については以下の機能が利用できる。
•
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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.