c＃Socket和TcpClient无法接收数据

Question

我尝试过使用Socket和TcpClient功能，发送后我无法接收数据。

我正在连接时钟设备，目标是向它发送一些命令并从中接收一些响应。该命令由设备识别，并应根据它检索数据。

所以我尝试使用以下代码的套接字：

private static string IP_ADDRESS    = "10.0.0.20";
private static Int32 IP_PORT        = 5010;
private static string TEXT_TO_SEND  = "(1,software)";

static void Main(string[] args)
{
    Socket mySocket     = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    IPAddress ip        = IPAddress.Parse(IP_ADDRESS);
    IPEndPoint ipEnd    = new IPEndPoint(ip, IP_PORT);

    mySocket.Connect(ipEnd);

    byte[] bytesToSend = ASCIIEncoding.ASCII.GetBytes(TEXT_TO_SEND);
    mySocket.Send(bytesToSend, 0, bytesToSend.Length, SocketFlags.None);

    Console.WriteLine("Sending : " + TEXT_TO_SEND);

    byte[] b                = new byte[100];
    int k                   = mySocket.Receive(b);
    string text_received    = Encoding.ASCII.GetString(b, 0, k);

    // ---- NEVER REACHES HERE ----
    Console.WriteLine("Receiving : " + text_received);
}

并尝试使用TcpClient。

private static string IP_ADDRESS    = "10.0.0.20";
private static Int32 IP_PORT        = 5010;
private static string TEXT_TO_SEND  = "(1,software)";

static void Main(string[] args)
{
    TcpClient client        = new TcpClient(IP_ADDRESS, IP_PORT);
    NetworkStream nwStream  = client.GetStream();
    byte[] bytesToSend      = ASCIIEncoding.ASCII.GetBytes(TEXT_TO_SEND);

    nwStream.Write(bytesToSend, 0, bytesToSend.Length);
    nwStream.Flush();

    Console.WriteLine("Sending : " + TEXT_TO_SEND);

    byte[] bytesToRead      = new byte[client.ReceiveBufferSize];
    int bytesRead           = nwStream.Read(bytesToRead, 0, client.ReceiveBufferSize);
    string text_received    = Encoding.ASCII.GetString(bytesToRead, 0, bytesRead);

    // ---- NEVER REACHES HERE ----
    Console.WriteLine("Receiving : " + text_received);
}

我没有收到错误，在调试时我清楚地看到两个代码都成功连接到机器（提供了IP和端口），但是没有检索到任何数据。