Add a data transfer module including user datagram protocol and transmission control protocol.

添加数据传输模块，分别实现了用户数据报协议和传输控制协议。

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Camera module and USB data transfer module are all well working, which has provided a solid foundation for the study of capsule endoscope next step.

经测试，摄像模块和USB数据传输模块均能够很好的工作，为以后进一步的研究打下了坚实的基础。

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