蓝牙4.0BLE协议栈就是将各个层定义的协议都集合在一起，以函数的形式实现，并提供一些应用层API，供用户调用。
注意：虽然协议是统一的，但是协议的具体实现形式是变化的，即不同厂商提供的协议栈是有区别的，例如：函数名称和参数列表可能有区别，选择协议栈以后，需要学习具体的例子，查看厂商提供的Demo演示程序、说明文档（通常，实现协议栈的厂商会提供一些API手册供用户查询）来学习各个函数的使用方式，进而快速地使用协议栈进行应用程序的开发工作。(The Bluetooth 4.0BLE protocol stack is the protocol that defines each layer together, implemented in the form of function, and provides some application layer API for the user to call.
Note: Although the agreement is uniform, but the protocol implementation is changed, the protocol stack of different vendors are different, for example: the function name and parameter list may have difference, after the choice of protocol stack, need to learn specific examples, see the vendor's Demo demo program, documentation (usually and the protocol stack vendors will provide some API manual for users to query) to learn the use of each function, and then quickly using the protocol stack application development work.)