蓝牙技术特点：Simple,Secure,Everywhere.另外，无须专利费。
优势： 1 低功耗
2 规定的Profile应用，安全可靠。
3 手机的通用性。
个人未来的蓝牙发展趋势：BLE以手机等移动设备为终端，低功耗蓝牙设备遍布世界。工作模式抛弃单工模式，进入全双工。高速模式生死未知，传统模式还得兼容发展。充满机会的行业：医疗，保健，可穿戴设备，小家电，音响，电视，手机等。
常用profile： A2DP Advanced Audio Distribution Profile 高级音频流传输处理
ATT(GATT) Attribute Profile( G for Generic) 通用属性
AVRCP Audio/video Remote Control Profile 音视频远程控制
BIP Basic Imaging Profile
DIP, Device ID Profile
FTP, File transfer Profile
GAP, Generic Access Profile
HSP, Headset Profile 耳机
蓝牙协议发展历史：
http://www.bluetooth.com/Pages/History-of-Bluetooth.aspx
蓝牙Profile分类（每个分类的链接内是详细原理）：
http://developer.bluetooth.org/TechnologyOverview/Pages/Profiles.aspx
蓝牙官方开发论坛，不过似乎不火：
http://developer.bluetooth.org/Forum/Pages/Forum.aspx
以下为个人记录，不感兴趣可以跳过。
Bluetooth Smart devices:
·are built to Bluetooth v4.0 specifications with Generic Attribute Profile (GATT) based architecture
·feature a single-mode low energy radio
Bluetooth device一般指低功耗纽扣电池式设备。
Range （范围）
Range is application specific and although a minimum range is mandated by the Core Specification, there is not a limit and manufacturers can tune their implementation to support the use case they are enabling.
Range may vary depending on class of radio used in an implementation:
Class 3 radios – have a range of up to 1 meter or 3 feet
Class 2 radios – most commonly found in mobile devices – have a range of 10 meters or 33 feet （最常用的范围：10米）
Class 1 radios – used primarily in industrial use cases – have a range of 100 meters or 300 feet
Interference （接口）
Bluetooth technology's adaptive frequency hopping (AFH，即跳频) capability was designed to reduce interference between wireless technologies sharing the 2.4 GHz spectrum. AFH works within the spectrum to take advantage of the available frequency. This is done by the technology detecting other devices in the spectrum and avoiding the frequencies they are using. This adaptive hopping among 79 frequencies at 1 MHz intervals gives a high degree of interference immunity and also allows for more efficient transmission within the spectrum. For users of Bluetooth technology this hopping provides greater performance even when other technologies are being used along with Bluetooth technology.
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