基于java的coap协议实现，并且里面有好多例子，易上手。-Coap java-based protocol, and there are many examples, approachable.

通过Californium的jar包来实现一个COAP协议的服务器端&客户端。客户端通过GET请求到服务器端，服务器端响应 hello world.(The server side & client of a COAP protocol is implemented through the jar package of the Californium. The client requests to the server side through the GET request a

是基于californium开发coap协议的jar包(Jar package based on californium to develop the COAP protocol)