/*********************************************************************************
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* Copyright: (C) 2018 LingYun IoT Studio
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* All rights reserved.
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*
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* Filename: socket_client.c
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* Description: This file is socket client sample source code, it will connect
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* socket server and send to/receive from it.
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*
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* Version: 1.0.0(10/23/2018)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "2018-10-23 01:38:08 PM"
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*
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********************************************************************************/
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <math.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "ds18b20.h"
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#include "tlv.h"
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#define SERVER_IP "127.0.0.1"
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#define SERVER_PORT 8889
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int main(int argc, char **argv)
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{
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int conn_fd = -1;
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int rv = -1;
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char buf[1024];
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struct sockaddr_in serv_addr;
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float temp;
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conn_fd = socket(AF_INET, SOCK_STREAM, 0);
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if(conn_fd < 0)
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{
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printf("create socket failure: %s\n", strerror(errno));
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return -1;
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}
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memset(&serv_addr, 0, sizeof(serv_addr));
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serv_addr.sin_family = AF_INET;
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serv_addr.sin_port = htons(SERVER_PORT);
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inet_aton( SERVER_IP, &serv_addr.sin_addr );
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if( connect(conn_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
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{
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printf("connect to server [%s:%d] failure: %s\n", SERVER_IP, SERVER_PORT, strerror(errno));
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return 0;
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}
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while(1)
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{
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if( ds18b20_get_temperature(&temp) < 0 )
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{
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printf("DS18B20 get temperature failure\n");
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continue;
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}
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printf("Current temperature: %f\n", temp);
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/*+-----------------------------------------------+
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*| TLV Format: Tag(1B) Length(1B) Value(2B) |
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*+-----------------------------------------------+*/
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memset(buf, 0, sizeof(buf));
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buf[0] = TAG_TEMP;
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buf[1] = 2; /*Length segement*/
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/*Value: 1st Bytes is integer part and 2nd bytes is fractional part */
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buf[2] = (int)temp & 0xFF;
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buf[3] = ( ((int)(temp*100))%100 ) & 0xFF ;
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//tlv_dump_buf("Temperature buff: ", buf, 4);
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if( write(conn_fd, buf, 4) < 0 )
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{
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printf("Write data to server [%s:%d] failure: %s\n", SERVER_IP, SERVER_PORT, strerror(errno));
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goto cleanup;
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}
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memset(buf, 0, sizeof(buf));
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rv = read(conn_fd, buf, sizeof(buf));
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if(rv < 0)
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{
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printf("Read data from server failure: %s\n", strerror(errno));
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goto cleanup;
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}
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else if( 0 == rv )
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{
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printf("Client connect to server get disconnected\n");
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goto cleanup;
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}
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tlv_dump_buf("Receive data from server: ", buf, rv);
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if( rv >= 2)
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{
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if( TAG_NAK == buf[0] )
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{
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printf("Parser TLV packet and get NOT Acknowledge reply from server!\n");
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}
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else if( TAG_ACK == buf[0] )
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{
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printf("Parser TLV packet and get Acknowledge reply from server!\n");
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}
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}
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sleep(5);
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}
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cleanup:
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close(conn_fd);
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}
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