Question

我正在为C＃中的GPS追踪器开发一个基于控制台的聆听应用程序，我的GPS追踪器配置为在服务器上发送具有特定端口的数据包，我的应用程序在该端口运行。现在的事情是根据GPS103的协议文件它首先发送我已在我的应用程序中收到的##,12345678999121,A字符串，但收到此字符串后，我必须从应用程序向我的GPS跟踪器发送“LOAD”，这将再次由GPS跟踪器通过发送消息进行响应登录成功。

问题：我必须在收到第一个字符串后发送命令，但我从未收到GPS追踪器的回复。

namespace PakTrackingListenerApp_tk103_
{
class Program
{
    static void Main(string[] args)
    {
        TcpListener listener = new TcpListener(1000);
        System.Net.ServicePointManager.Expect100Continue = false;
        listener.Start();

        while (true)
        {
            Console.WriteLine("Waiting for a connection");
            TcpClient client = listener.AcceptTcpClient();
            StreamReader sr = new StreamReader(client.GetStream());
            StreamWriter sw = new StreamWriter(client.GetStream());

            try
            {
                string request = sr.ReadLine();
                Console.WriteLine("GPS Command" + request);
                string[] tokens = request.Split(',');

                string response = "LOAD";
                if (tokens[0] == "##")
                {
                    response = "LOAD";
                    Console.WriteLine("Token" + tokens[0]);
                }

                sw.WriteLine(response);
                sw.Flush();
            }
            catch (Exception e)
            {
                Console.WriteLine("Exception :" +e.Message);
            }
            client.Close();
        }
    }
}
}

Answer 1

您正在终止与client.Close();的连接而未阅读回复。不要关闭，直到它返回空。

1）设备发送##,12345678999121,A

2）回复LOAD

3）它发送回12345678999121;

4）回复**,imei:12345678999121,B;

5）它会发回追踪数据imei:12345678999121,tracker,161003171049,,F,091045.000,A,1017.6730,N,07845.7982,E,0.00,0;

6）回复ON

现在它不断重复步骤3到6。

请参阅这些链接以了解正确用法。

https://github.com/tananaev/traccar/blob/master/src/org/traccar/protocol/Gps103ProtocolDecoder.java

http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=108384&whichpage=80

代码示例：

  ' Enter the listening loop. 
        While True
            Console.Write(listeningPort & " Waiting for a connection... " & vbLf)

            ' Perform a blocking call to accept requests. 
            ' You could also user server.AcceptSocket() here. 
            Dim client As TcpClient = server.AcceptTcpClient()
            Console.WriteLine(listeningPort & " Connected!")

            data = Nothing

            ' Get a stream object for reading and writing 
            Dim stream As NetworkStream = client.GetStream()
            stream.ReadTimeout = 180000

            Dim i As Int32

            ' Loop to receive all the data sent by the client.
            i = stream.Read(bytes, 0, bytes.Length)
            While (i <> 0)
                ' Translate data bytes to a ASCII string.
                data = System.Text.Encoding.ASCII.GetString(bytes, 0, i)
                Console.WriteLine(listeningPort & " Received: {0}", data)

                If Trim(data) <> "" Then
                    If Trim(data).StartsWith("##,") Then
                        Dim byte1 As Byte() = System.Text.Encoding.ASCII.GetBytes("LOAD")
                        stream.Write(byte1, 0, byte1.Length)
                    ElseIf Trim(data).EndsWith(";") And Trim(data).Contains("imei:") = False Then
                        Dim byte1 As Byte() = System.Text.Encoding.ASCII.GetBytes("**,imei:" & data.Replace(";", ",B;"))
                        stream.Write(byte1, 0, byte1.Length)
                    Else

           'TODO: PROCESS THE DATA HERE

                        Dim byte1 As Byte() = System.Text.Encoding.ASCII.GetBytes("ON")
                        stream.Write(byte1, 0, byte1.Length)
                    End If
                End If

                Try
                    i = stream.Read(bytes, 0, bytes.Length)
                Catch ex As IOException     'Added For the Timeout, End Connection and Start Again
                    If ex.Message.Contains("did not properly respond after a period of time") Then
                        'WriteLog("Port: " & listeningPort & " IOException: " & ex.Message)
                        client.Close()
                        server.Server.Close()
                        server.Stop()
                    Else
                        Try
                            client.Close()
                            server.Server.Close()
                            server.Stop()
                        Catch e As Exception
                            'WriteLog("Port: " & listeningPort & " Error in Closing Port. : " & e.Message)
                        End Try
                    End If
                    GoTo finalblock
                End Try
            End While
            ' Shutdown and end connection
            client.Close()
        End While

这些设备的框或手册中没有显示协议格式。找到协议本身很难。

用C＃进行GPS103跟踪器聆听应用

1 个答案: