一个可以在Arm Linux环境下运行的对时程序，基于socket编写，可移植性强。
配置好了交叉编译工具链之后，直接make即可。
代码采用C++的面向对象开发，简单易用，模块清晰，便于裁剪和模块复用。(A time program that can run in Arm Linux environment is written based on socket, and has strong portability.
After configuring the cross compilation tool chain, we can directly make.
The code is object-oriented development based on C++, which is simple and easy to use, clear module, easy to cut and module reuse.)