说明：  蓝牙4.0 BLE开发完全手册高清书签版pdf，适用于蓝牙芯片cc2540，可供学习与使用者参考 （因文件大小限制，现分卷压缩上传，此为卷二，有需要请两卷一起下载解压）
(Bluetooth 4.0 BLE development complete manual HD bookmark version pdf, suitable for Bluetooth chip cc2540, for learning and user reference (Because of the file size limit, the current volume is compressed and uploaded. This is volume 2. If you need to download the two volumes, unzip it.))