tcpclient

要点：

串口转int:

printf("%d
",atoi(argv[2]));

获取信号强度：

int fill_ntfd_common_info()
{
    FILE * fp;
    char link_str[8];
    int i, link_len;
    int link_percent;
    
    fp = popen("iwinfo | grep "Quality" | awk '{print $6}'", "r");
    fgets(link_str, sizeof(link_str), fp);
    pclose(fp);
    link_len = strlen(link_str);// include '' ;link_str is unknown/70 or link_str is 48/70
    i = 0;
    while (i < link_len) {
        //if (link_str[i] == '\') { 
        if (link_str[i] == 'u') {  //if the quality is "unknown/70"
            link_str[i] = 0;
            break;
        }
        i++;
    }
    //link_percent = atoi(link_str)*10/7;  //get the molecular
    link_percent = atoi(link_str)*51/14;  
    return link_percent;
}

socket断线重连:

//if( send(sockfd, sendline, strlen(sendline), 0) < 0)
        if( send(sockfd, sendline, 29, 0) < 0) //array
        {
            printf("send msg error: %s(errno: %d)
", strerror(errno), errno);
            //exit(0);
            //reconnect
            close(sockfd);
            sockfd = socket(AF_INET, SOCK_STREAM, 0);
            if (sockfd == -1) {
                printf("socket Error!!! Error # is %d. Exit!
", errno);
                exit(-1);
            }
            while(-1 == connect(sockfd,(struct sockaddr *)(&servaddr), sizeof(struct sockaddr))) {
            printf("Reconnect to server fail !
");
            sleep(10);
            }    
            printf("send msg to server: 
");
        }

1、src文件夹下源码

//客户端

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>

#define MAXLINE 4096

int fill_ntfd_common_info()
{
    FILE * fp;
    char link_str[8];
    int i, link_len;
    int link_percent;
    
    fp = popen("iwinfo | grep "Quality" | awk '{print $6}'", "r");
    fgets(link_str, sizeof(link_str), fp);
    pclose(fp);
    link_len = strlen(link_str);// include '' ;link_str is unknown/70 or link_str is 48/70
    i = 0;
    while (i < link_len) {
        //if (link_str[i] == '\') { 
        if (link_str[i] == 'u') {  //if the quality is "unknown/70"
            link_str[i] = 0;
            break;
        }
        i++;
    }
    //link_percent = atoi(link_str)*10/7;  //get the molecular
    link_percent = atoi(link_str)*51/14;  
    return link_percent;
}

int main(int argc, char** argv)
{
    int    sockfd, n;
    char    recvline[4096];//, sendline[4096];
    char sendline[29] = {0x0D,0x00,0xD2,0x19,//头部
          0x2C,0x08,0x04,//源，第三个为类型，00无效；01主机；02基站；03为CS；04节点
          0x00,0x00,0x01,//目标，第三个为类型，
          0x00,0x07,0x94,0x11,0xAB,0x4C,0x2B,0xE6,0x00,//固定
          0x02,0x04,0x02,0x01, //4通道，4个字节，格式2，第一通道
          0x00,0x00,//数据
          0x2E,0x20,0x0D,0x0A};//结束
    struct sockaddr_in    servaddr;
    int sret;

    if( argc != 3){
    printf("usage: tcpclient <ipaddress> <seconds>
");
    exit(0);
    }

    if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
    printf("create socket error: %s(errno: %d)
", strerror(errno),errno);
    //exit(0);
    return -1;
    }

    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(10001);
    if( inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0){
    printf("inet_pton error for %s
",argv[1]);
    //exit(0);
    return -1;
    }

    if( connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0){
    printf("connect error: %s(errno: %d)
",strerror(errno),errno);
    //exit(0);
    sleep(10);
    }

    printf("send msg to server: 
");
    //fgets(sendline, 4096, stdin);
    while(1)
    {
        sendline[14] = fill_ntfd_common_info();
        //if( send(sockfd, sendline, strlen(sendline), 0) < 0)
        if( send(sockfd, sendline, 29, 0) < 0) //array
        {
            printf("send msg error: %s(errno: %d)
", strerror(errno), errno);
            //exit(0);
            //reconnect
            close(sockfd);
            sockfd = socket(AF_INET, SOCK_STREAM, 0);
            if (sockfd == -1) {
                printf("socket Error!!! Error # is %d. Exit!
", errno);
                exit(-1);
            }
            while(-1 == connect(sockfd,(struct sockaddr *)(&servaddr), sizeof(struct sockaddr))) {
            printf("Reconnect to server fail !
");
            sleep(10);
            }    
            printf("send msg to server: 
");
        }    
        sleep(atoi(argv[2]));    
    }

    close(sockfd);
    exit(0);
}

2、src下Makefile

all: tcpclient

tcpclient: tcpclient.c
    $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $<

clean:
    rm -f tcpclient

3、tcpclient下Makefile

#
# Copyright (C) 2010-2012 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
# Quality;
# reconnect;
# return -1;
#
include $(TOPDIR)/rules.mk

PKG_NAME:=tcpclient
PKG_VERSION:=0.1.3
PKG_RELEASE:=1

include $(INCLUDE_DIR)/package.mk

define Package/tcpclient
  SECTION:=utils
  CATEGORY:=Utilities
  TITLE:=tcpclient 
  MAINTAINER:=tingpan
  PKGARCH:=all
endef

define Package/tcpclient/description
    this is a tcp client
endef

define Build/Prepare
    mkdir -p $(PKG_BUILD_DIR)
    $(CP) ./src/* $(PKG_BUILD_DIR)/
endef

define Build/Configure
endef

define Build/Compile
    $(MAKE) -C $(PKG_BUILD_DIR) 
        CC="$(TARGET_CC)" 
        CFLAGS="$(TARGET_CFLAGS) -Wall" 
        LDFLAGS="$(TARGET_LDFLAGS)"
endef

define Package/tcpclient/install
    $(INSTALL_DIR) $(1)/usr/sbin
    $(INSTALL_BIN) $(PKG_BUILD_DIR)/tcpclient $(1)/usr/sbin/
endef

$(eval $(call BuildPackage,tcpclient))