c# - 用于 Unity3d 5.x 的极简主义 Python 服务器

Question

TL;DR:我在 Unity3D 客户端应用程序和服务器上的 UDP python 监听器之间进行通信时遇到问题。

我正在尝试通过 Unity 5.x NetworkTransport LLAPI 和 Python 3.x 套接字模块简单地从 Unity3D 游戏客户端获取低级调用和响应

目标:将发送到服务器的消息弹回客户端。

问题:

• 当我运行 Unity3d 客户端时，套接字打开并且服务器每秒打印一个新的 recvfrom 数据，但 unity 从未收到退回的数据。
• 大约 10 秒后，客户端会收到超时错误以及 DisconnectEvent。

状态:

客户端:Unity 5.4

服务器:亚马逊AWS，开放8888端口

服务器端 python 应用程序:

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(('', 8888))

print ('Listening on port 8888')

while True:
    data, addr = s.recvfrom(4096)

    if data:
        for i in range(0, len(data)):
            print (data[i])
        print (data, addr)
        s.sendto(data, addr)

客户端Unity网络类:

using UnityEngine;
using UnityEngine.Networking;
using System.Collections;

public class NetworkExecutor : MonoBehaviour
{
    const string addr = IP_ADDR;
    const int port = PORT;

    bool connected = false;

    // Doing lots of error checks but no need to save them. Let's def this and hold onto it.
    byte e;

    void Start ()
    {
        // Some testing involves waiting for responses or repetitious send/receive calls.
        // We do this in coroutines for both efficiency and human sanity.
        StartCoroutine(TestNetwork());
    }

    IEnumerator TestNetwork()
    {
        // Define network configurations.
        ConnectionConfig config = new ConnectionConfig();
        int reliableChannel = config.AddChannel(QosType.Reliable);
        int maxConnections = 10;
        HostTopology hostTopo = new HostTopology(config, maxConnections);

        // Initialize and connect network with config.
        NetworkTransport.Init();
        int hostId = NetworkTransport.AddHost(hostTopo);
        int connectionId = NetworkTransport.Connect(hostId, addr, port, 0, out e);

        Debug.Log("<b>Connect.</b> Host ID: " + hostId + " Connection ID: " + connectionId);
        ErrStr(e);

        // Send test message.
        byte[] msg = System.Text.Encoding.UTF8.GetBytes("Send string");
        NetworkTransport.Send(hostId, connectionId, reliableChannel, msg, 4096, out e);
        Debug.Log("<b>Send.</b> Msg: " + msg);
        ErrStr(e);

        // Receive test message.
        int recHostId;
        int recConnectionId;
        int recChannelId;
        int recSize;
        msg = System.Text.Encoding.UTF8.GetBytes("Unmodified byte buffer.");
        NetworkEventType eventType = NetworkTransport.Receive(out recHostId, out recConnectionId, out recChannelId, msg, 4096, out recSize, out e);
        Debug.Log("<b>Receive.</b> Type: " + eventType + " Msg: " + System.Text.Encoding.UTF8.GetString(msg));
        Debug.Log("(hID:" + recHostId + " cID:" + recConnectionId + " chId:" + recChannelId + " " + recSize + ")");
        ErrStr(e);

        NetworkTransport.Disconnect(hostId, connectionId, out e);
        ErrStr(e);

        yield break;
    }

    string ErrStr(byte e)
    {
        switch ((NetworkError)e)
        {
            case NetworkError.Ok:
                return "Ok";
            case NetworkError.WrongHost:
                return "<color=red>Wrong Host</color>";
            case NetworkError.WrongConnection:
                return "<color=red>Wrong Connection</color>";
            case NetworkError.WrongChannel:
                return "<color=red>Wrong Channel</color>";
            case NetworkError.NoResources:
                return "<color=red>No Resources</color>";
            case NetworkError.BadMessage:
                return "<color=red>Bad Message</color>";
            case NetworkError.Timeout:
                return "<color=red>Timeout</color>";
            case NetworkError.MessageToLong:
                return "<color=red>Message Too Long</color>";
            case NetworkError.WrongOperation:
                return "<color=red>Wrong Operation</color>";
            case NetworkError.VersionMismatch:
                return "<color=red>Version Mismatch</color>";
            case NetworkError.CRCMismatch:
                return "<color=red>CRC Mismatch</color>";
            case NetworkError.DNSFailure:
                return "<color=red>DNS Failure</color>";
            default:
                return "<color=red><b>Big problem, we don't know this error code.</b></color>";
        }
    }
}

** 请原谅困惑。与我的自然冲动相反，这里忽略了许多编码约定和良好实践。这是因为该应用程序仅用于了解 Unity 和 Python 最基本的低级网络用法。当可以建立原始信号量时，它将被丢弃并适本地重写。

Answer 1

UDP 和TCP 都是标准协议(protocol)。这意味着无论您使用什么编程语言，它们都应该能够相互通信。

您的 Python 代码使用的是标准 UDP 代码。您的 Unity 代码不是。您使用的 NetworkTransport API 仅用于两个 Unity 应用程序之间的通信。它是一个 LLAPI 库，它是一个建立在 UDP 之上的锡层。同样，它不是旨在用于 Unity 和标准 UDP 连接之间的连接，而是用于两个 Unity 程序之间的连接。

要与您的 python UDP 代码通信，您必须使用 UdpClient C# 代码中 System.Net.Sockets 命名空间中的类。这是一个 example Unity 中的 UDP 代码。