unity 保持一个UDP

Unity 中可以使用 NetworkTransport 类来保持一个 UDP 连接。以下是一个简单的示例代码：

using UnityEngine.Networking;

public class MyNetworkManager : MonoBehaviour {

    private int m_HostId;
    private int m_ConnectionId;
    private int m_ChannelId;
    private byte[] m_Buffer = new byte[1024];

    void Start() {
        NetworkTransport.Init();
        ConnectionConfig config = new ConnectionConfig();
        m_ChannelId = config.AddChannel(QosType.Unreliable);
        HostTopology topology = new HostTopology(config, 1);
        m_HostId = NetworkTransport.AddHost(topology);
        m_ConnectionId = NetworkTransport.Connect(m_HostId, "127.0.0.1", 8888, 0, out byte error);
        if (error != 0) {
            Debug.LogError($"Failed to connect: {error}");
        }
    }

    void Update() {
        int recHostId;
        int recConnectionId;
        int recChannelId;
        int dataSize;
        byte error;
        NetworkEventType eventType = NetworkTransport.Receive(out recHostId, out recConnectionId, out recChannelId, m_Buffer, m_Buffer.Length, out dataSize, out error);
        switch (eventType) {
            case NetworkEventType.Nothing:
                break;
            case NetworkEventType.ConnectEvent:
                Debug.Log("Connected");
                break;
            case NetworkEventType.DataEvent:
                Debug.Log($"Received {dataSize} bytes");
                break;
            case NetworkEventType.DisconnectEvent:
                Debug.Log("Disconnected");
                break;
        }
    }

    void OnDestroy() {
        NetworkTransport.Shutdown();
    }
}

这个例子创建了一个 UDP 连接，连接到本地 IP 地址 127.0.0.1 的端口 8888。在 Update 函数中，它接收任何传入的数据，并在控制台上打印一些信息。你可以按照你的需求修改代码。