/** * \addtogroup apps * @{ *//** * \defgroup helloworld Hello, world * @{ * * A small example showing how to write applications with * \ref psock "protosockets". *//** * \file *         Header file for an example of how to write uIP applications *         with protosockets. * \author *         Adam Dunkels <adam@sics.se> */#ifndef __HELLO_WORLD_H__#define __HELLO_WORLD_H__/* Since this file will be included by uip.h, we cannot include uip.h   here. But we might need to include uipopt.h if we need the u8_t and   u16_t datatypes. */#include "uipopt.h"#include "psock.h"/* Next, we define the uip_tcp_appstate_t datatype. This is the state   of our application, and the memory required for this state is   allocated together with each TCP connection. One application state   for each TCP connection. */typedef struct hello_world_state {  struct psock p;  char inputbuffer[200];  char name[40];}uip_tcp_appstate_t;/* Finally we define the application function to be called by uIP. */void hello_world_appcall(void);#ifndef UIP_APPCALL#define UIP_APPCALL hello_world_appcall#endif /* UIP_APPCALL */void hello_world_init(void);#endif /* __HELLO_WORLD_H__ *//** @} *//** @} */