/*********************************************************************************
 *      Copyright:  (C) 2018 LingYun IoT Studio
 *                  All rights reserved.
 *
 *       Filename:  socket_client.c
 *    Description:  This file is socket client sample source code, it will connect
 *                  socket server and send to/receive from it.
 *                 
 *        Version:  1.0.0(10/23/2018)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "2018-10-23 01:38:08 PM"
 *                 
 ********************************************************************************/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <math.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "ds18b20.h"
#include "tlv.h"

#define SERVER_IP          "127.0.0.1"
#define SERVER_PORT        8889


int main(int argc, char **argv)
{
    int                     conn_fd = -1;
    int                     rv = -1;    
    char                    buf[1024]; 
    struct sockaddr_in      serv_addr;
    float                   temp;

    conn_fd = socket(AF_INET, SOCK_STREAM, 0);
    if(conn_fd < 0)
    {
        printf("create socket failure: %s\n", strerror(errno));
        return -1;
    }

    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(SERVER_PORT);
    inet_aton( SERVER_IP, &serv_addr.sin_addr );

    if( connect(conn_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr))  < 0)
    {
        printf("connect to server [%s:%d] failure: %s\n", SERVER_IP, SERVER_PORT, strerror(errno));
        return 0;
    }

    while(1)
    { 
	    if( ds18b20_get_temperature(&temp) < 0 )
	    {
		    printf("DS18B20 get temperature failure\n");
		    continue;
	    }
	    printf("Current temperature: %f\n", temp);

	    /*+-----------------------------------------------+
	     *| TLV Format:  Tag(1B) Length(1B) Value(2B)     | 
	     *+-----------------------------------------------+*/
	    memset(buf, 0, sizeof(buf));
	    buf[0] = TAG_TEMP; 
	    buf[1] = 2;  /*Length segement*/

	    /*Value: 1st Bytes is integer part and 2nd bytes is fractional part */
	    buf[2] = (int)temp & 0xFF;
	    buf[3] = ( ((int)(temp*100))%100 )  & 0xFF ; 

	    //tlv_dump_buf("Temperature buff: ", buf, 4);

	    if( write(conn_fd, buf, 4) < 0 )
	    {
		    printf("Write data to server [%s:%d] failure: %s\n", SERVER_IP, SERVER_PORT, strerror(errno));
		    goto cleanup;
	    }

	    memset(buf, 0, sizeof(buf));
	    rv = read(conn_fd, buf, sizeof(buf));    
	    if(rv < 0)
	    {
		    printf("Read data from server failure: %s\n", strerror(errno));
		    goto cleanup;
	    }
	    else if( 0 == rv )
	    {
		    printf("Client connect to server get disconnected\n");
		    goto cleanup;
	    }

	    tlv_dump_buf("Receive data from server: ", buf, rv);
	    if( rv >= 2)
	    {
		    if( TAG_NAK == buf[0] )
		    {
			    printf("Parser TLV packet and get NOT Acknowledge reply from server!\n");
		    }
		    else if( TAG_ACK == buf[0] )
		    {
			    printf("Parser TLV packet and get Acknowledge reply from server!\n");
		    
		    }
	    }


	    sleep(5);
    }


cleanup:
    close(conn_fd);
}