使用 c# 连接到压力传感器以获取值，在 c# 中不起作用

Question

我有一个传感器，我使用网络连接到这个传感器 cable.I 应该向这个传感器发送命令以获取值。

The sensor ip is :192.168.2.44
my computer ip:192.168.2.111

我使用了一个名为 hercules 的程序来连接传感器：

在 TCP server 选项卡中，当我单击 listen button 时，我将端口定义为 3000 程序显示了这一点（如图所示）client connected

连接后，我可以向传感器发送命令以获取如图所示的值：

我找到了这段代码，但它不起作用，我无法通过它发送命令来获取值，主要问题是我的代码无法连接到端口，你能帮我一些忙吗？我是套接字编程的新手。

代码：

try
{
    string hostname = "192.168.2.44";
    int portno = 3000;
    IPAddress ipa = Dns.GetHostAddresses(hostname)[0];
    try
    {
        System.Net.Sockets.Socket sock = new System.Net.Sockets.Socket(System.Net.Sockets.AddressFamily.InterNetwork, System.Net.Sockets.SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp);
        sock.Connect(ipa, portno);
        if (sock.Connected == true)  // Port is in use and connection is successful
            Console.WriteLine("Port is Closed");
        sock.Close();
    }
    catch (System.Net.Sockets.SocketException ex)
    {
        if (ex.ErrorCode == 10061)  // Port is unused and could not establish connection 
            Console.WriteLine("Port is open");
        else
            Console.WriteLine(ex.ErrorCode);
    }
}
catch (Exception e)
{
    Console.WriteLine(e.ToString());
    Console.ReadLine();
}

异常：

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 192.168.2.44:3000

我应该使用 c#

实现类似 hercules 的东西

Answer 1

在您的截图中，PC 是主设备（它打开一个监听服务器套接字），传感器是从设备。当您的代码假设时，该 PC 会尝试作为客户端连接到传感器。

最小的代码片段是这样的：

        var listener = new TcpListener(IPAddress.Any, 3000);
        listener.Start();

        using (var client = listener.AcceptTcpClient())
        using (var stream = client.GetStream())
        {
            // build a request to send to sensor
            var request = new byte[] { /*...*/ };
            stream.Write(request, 0, request.Length);
            // read a response from sensor;
            // note, that respose colud be broken into several parts;
            // you should determine, when reading is complete, according to the protocol for the sensor
            while (!/* response is complete */)
            {                    
                // stream.Read calls here
            }
        }

另请注意，如果协议是文本的，那么您可以使用 StreamWriter/StreamReader 构建请求和解析响应。

使用 c# 连接到压力传感器以获取值，在 c# 中不起作用

Connect to pressure sensor using c# to get the value ,doesn't work in c#

c#

sockets

listener

tcpclient

tcpserver