Bootstrap

WSL和Windows建立TCP通信协议

1.windows配置

首先是windows端,启动TCP服务端,用来监听指定的端口号,其中IP地址可以设置为任意,否则服务器可能无法正常打开。

addrSer.sin_addr.S_un.S_addr = INADDR_ANY;

recv函数用来接收客户端传输的数据,其中sum表示接收到的字节数。

为了能将接收到的char数据转换成16进制形式,方便与发送数据进行比对。

rece = ToHexString((unsigned char*)recvbuf, sum);

这里sum不能替换为strlen(recvbuf),strlen在检测到"00"后会自动结束,打印的数据不全。

string ToHexString(unsigned char* input, int datasize)
{
        stringstream ss;
        ss << setbase(16) << setfill('0');
        for (int i = 0; i < datasize; i++)
                ss << setw(2) << (UINT)input[i];
        return ss.str();
}

TCP接收到的不是一个一个的数据,而是一段一段的数据,中间可能包含着多条信息,需要根据起始位将信息提取出来。

vector<int> positions = findAllSubstringPositions(rece, "aaa55a");
vector<string> s;
if(positions.size()>0){
        s.push_back(rece.substr(0, positions[0] + 2));
        for (int i = 1; i < positions.size(); i++) {
                cout << positions[i - 1] << endl;
                s.push_back(rece.substr(positions[i-1] + 2, positions[i]- positions[i - 1]));
        }
        s.push_back(rece.substr(positions[positions.size()-1]+2));
}
else {
        s.push_back(rece);
}
for(int j=0;j<= positions.size();j++)
        cout << s[j] << endl;

这里由于不知道一段包含命令的个数,所以用vector容器来存放比较合适,同时substr第一个参数是起始位置,第二个参数是需要提取字符串的长度,不是终止位置。

2.WSL配置

WSL作客户端,用来监听串口数据并返还给服务端。

第一步:让WSL可以检测到USB

powershell输入usbipd list查看当前USB设备(电脑间测试需要串口盒辅助,另外一台电脑打开串口调试助手,向WSL发送十六进制数据)

usbipd bind --busid 1-6   共享串口

usbipd attach --wsl -b 1-6   附加USB设备到WSL上

WSL输入lsusb检测当前USB设备

ls /dev/tty*查看USB设备的端口号

第二步:WSL开启串口监听

根据查询到的端口号配置端口

    //listen uart
    fd1 = open( "/dev/ttyS9", O_RDWR);
    if (fd1 == -1) {
        printf("open error!\n");
    }
    int nset = set_opt(fd1, 115200, 8, 'N', 1);
    if (nset == -1) {
        printf("set error!\n");
    }

第三步:配置接收线程

主函数开启线程std::thread uart(uart_read);

while(1)循环里连续接收n = read(fd1, send_buf, UART_BUFF);

n表示接收到的字符串长度,这里read可能会分段接收,加入起始位和长度的判断

        if(n>0){
            if(n>2){
                if(ToHexString((unsigned char*)send_buf,2) == "a55a"){
                    flag=1;
                    count=0;
                    memset(rece_buf,'\0',UART_BUFF);
                    numchar = (unsigned char)send_buf[2];
                    sum = (int)numchar;
                }
            }
            if(flag){
                for(int i=count;i<(count+n);i++){
                    rece_buf[i] = send_buf[i-count];
                }
                count += n;
                if(sum == (count-2)){
                    cout << ToHexString((unsigned char*)rece_buf,sum+2) << endl;
                    len=send(client_sockfd, rece_buf, count, 0);//TCP客户端发送
                    count = 0;
                }else if(sum < (count-2)){
                    flag = 0;
                    count = 0;
                }
            }
        }

这里数据的长度为unsigned char类型,用int强转

count表示接收到的字符串长度,其中rece_buf不能使用strcat来进行拼接,还是"00"的问题。

第四步:文件编译

一般的文件编译使用gcc -o 工程名 工程文件的格式

而std::thread则要

g++ -o 工程名 工程文件名 -lpthread -std=c++11

执行:

        ./工程名

完整代码

#include<iostream>
#include<cstring>
#include<unistd.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include <termios.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <thread>
#include <time.h>
#include <exception>
#include <syslog.h>
#include <stdlib.h>
#include <sstream>
#include <iomanip>
#include <string>

using namespace std;
typedef unsigned int UINT;
#define UART_BUFF 2048

int client_sockfd;
int len;
int fd1=-1;

string ToHexString(unsigned char* input, int datasize)
{
	stringstream ss;
	ss << setbase(16) << setfill('0');
	for (int i = 0; i < datasize; i++)
		ss << setw(2) << (UINT)input[i];
	return ss.str();
}

int set_opt(int fd,int nSpeed, int nBits, char nEvent, int nStop)
{
    struct termios newtio,oldtio;

    if  ( tcgetattr( fd,&oldtio)  !=  0)
    {
        perror("SetupSerial 1");
        return -1;
    }

    bzero( &newtio, sizeof( newtio ) );
    newtio.c_cflag  |=  CLOCAL | CREAD;
    newtio.c_cflag &= ~CSIZE;

    switch( nBits )
    {
        case 7:
            newtio.c_cflag |= CS7;
            break;
        case 8:
            newtio.c_cflag |= CS8;
            break;
    }

    switch( nEvent )
    {
        case 'O':
            newtio.c_cflag |= PARENB;
            newtio.c_cflag |= PARODD;
            newtio.c_iflag |= (INPCK | ISTRIP);
            break;
        case 'E':
            newtio.c_iflag |= (INPCK | ISTRIP);
            newtio.c_cflag |= PARENB;
            newtio.c_cflag &= ~PARODD;
            break;
        case 'N':
            newtio.c_cflag &= ~PARENB;
            break;
    }

    switch( nSpeed )
    {
        case 2400:
            cfsetispeed(&newtio, B2400);
            cfsetospeed(&newtio, B2400);
            break;
        case 4800:
            cfsetispeed(&newtio, B4800);
            cfsetospeed(&newtio, B4800);
            break;
        case 9600:
            cfsetispeed(&newtio, B9600);
            cfsetospeed(&newtio, B9600);
            break;
        case 115200:
            cfsetispeed(&newtio, B115200);
            cfsetospeed(&newtio, B115200);
            break;
        case 460800:
            cfsetispeed(&newtio, B460800);
            cfsetospeed(&newtio, B460800);
            break;
        default:
            cfsetispeed(&newtio, B9600);
            cfsetospeed(&newtio, B9600);
            break;
    }

    if( nStop == 1 )
        newtio.c_cflag &=  ~CSTOPB; 
    else if ( nStop == 2 )
        newtio.c_cflag |=  CSTOPB;

    newtio.c_cc[VTIME]  = 0;
    newtio.c_cc[VMIN] = 0;
    tcflush(fd,TCIFLUSH);

    if((tcsetattr(fd,TCSANOW,&newtio))!=0)
    {
        perror("com set error");
        return -1;
    }

    return 0;
}

void uart_read(){
	char send_buf[UART_BUFF];
	int flag=0;
	int sum=0,count=0;
	char rece_buf[UART_BUFF];
    char send_buf_use[UART_BUFF];
	string numStr;
    unsigned char numchar;
    int n;
	while(1){
        n = read(fd1, send_buf, UART_BUFF);
        //cout << n << endl;
		if(n>0){
			if(n>2){
				if(ToHexString((unsigned char*)send_buf,2) == "a55a"){
					flag=1;
					count=0;
					memset(rece_buf,'\0',UART_BUFF);
                    numchar = (unsigned char)send_buf[2];
                    sum = (int)numchar;
                    // cout << ToHexString((unsigned char*)send_buf,n) << "***" << endl;
				}
			}
			if(flag){
				cout << ToHexString((unsigned char*)send_buf,n) << "***" << endl;
				for(int i=count;i<(count+n);i++){
					rece_buf[i] = send_buf[i-count];
				}
				count += n;
				//cout << ToHexString((unsigned char*)rece_buf,count) << endl;
			
				if(sum == (count-2)){
                    cout << ToHexString((unsigned char*)rece_buf,sum+2) << endl;
					len=send(client_sockfd, rece_buf, count, 0);
					count = 0;
				}else if(sum < (count-2)){
					flag = 0;
					count = 0;
				}
			}
		}
        //else
            //usleep(5000);
	}
	return;	
}

int main()
{
	struct sockaddr_in remote_addr;
   	char recv_buf[UART_BUFF];
   	char send_buf[UART_BUFF];
	memset(&remote_addr, 0, sizeof(remote_addr));
	remote_addr.sin_family=AF_INET;
	remote_addr.sin_addr.s_addr=inet_addr("192.168.192.100");
	remote_addr.sin_port=htons(6666);
	
	//listen uart
	fd1 = open( "/dev/ttyS9", O_RDWR);
	if (fd1 == -1) {
	    printf("open error!\n");
	}
	int nset = set_opt(fd1, 115200, 8, 'N', 1);
	if (nset == -1) {
	    printf("set error!\n");
	}
	
	//IPv4 tcp
	if((client_sockfd=socket(PF_INET, SOCK_STREAM, 0))<0)
	{
		cout<<"socket error";
		return 1;
	}
	
	if(connect(client_sockfd, (struct sockaddr*)&remote_addr, sizeof(struct sockaddr))<0)
	{
		cout<<"connect error";
		return 1;
	} 
	
	cout<<"connected to server"<<endl;
	std::thread uart(uart_read);
	
	while(1)
	{
		usleep(100);
	}
	uart.join();
	close(client_sockfd);
	close(fd1);
	return 0;
}
 
 
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