在BLE协议中，有两个角色，Periphery和Central； Peripheral 是数据提供者，Central 是数据用户/处理器；在 iOS SDK 中，一个 iOS 设备可以作为外围设备，也可以作为中心；但在Android SDK中，直到最新的Android4.4.2，Android手机只能以数据为中心使用和处理；数据来自哪里？从 BLE 设备来看，现在很多可穿戴设备都使用 BLE 来提供数据。
一个中心可以同时连接多个外围，但一个外围一次只能连接一个中心。
(In ble protocol, there are two roles, periphery and central; Peripheral is the data provider, and central is the data user / processor; In the IOS SDK, an IOS device can be used as a peripheral device or as a center; However, in the Android SDK, until the latest android4.4.2, Android phones can only be used and processed based on data; Where does the data come from? From the perspective of ble devices, many wearable devices now use ble to provide data.
A center can connect multiple peripherals at the same time, but a periphery can only connect one center at a time.)
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