#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sysLib.h>

/******************************************************************************/
#define MAX_BUF 1600

#define PORT 6987

/******************************************************************************/
/**
 * MAIN - Server: read data; send concated text back
 */ 
int main(int argc, char* argv[])
{                   
    int clientAddrLen;  
    int bindStatus, sendStatus;
    int socketFD;  
    int recieved;
    char buffer[MAX_BUF];  
    struct sockaddr_in serverAddr;
    struct sockaddr_in clientAddr;  
        
    //set clock
    sysClkRateSet(5000);    
        
    //create socket
    socketFD = socket(AF_INET, SOCK_DGRAM, 0); //, , ??  IPPROTO_UDP  ??
    if (socketFD == -1)
    {
      perror("Socket creation error");
      exit(1);
    }
    printf("Socket created\n");
    
    //server address - set structs
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = INADDR_ANY;  
    serverAddr.sin_port = htons(PORT);
    
    //bind
    bindStatus = bind(   socketFD, (struct sockaddr*)&serverAddr, sizeof(serverAddr)    );
    printf("Bind: %d\n",bindStatus);
    printf("Recieving on port: %d\n", PORT);
    
    //set cliet Addr length
    clientAddrLen = sizeof(clientAddr);
    
    //recieve data
    while(1)
    {
        recieved = recvfrom(   socketFD, buffer, MAX_BUF, 0, (struct sockaddr*)&clientAddr, (socklen_t*)&clientAddrLen   );    
        printf("Recieved from %s: %s", inet_ntoa(clientAddr.sin_addr), buffer);
        
        //if data
        if( recieved>0 )
        {
          //append text 
          strcat(buffer, "_RECIEVED\n");
          
          //send back
          sendStatus = sendto(sockd, buf, strlen(buf)+1, 0, (struct sockaddr*)&clientAddr, sizeof(clientAddr));
          printf("Send: %d\n", sendStatus);
        }           
    }
    
    //close
    close(socketFD);      
    return 0;
}