Network.TestConnection 测试连接

var testStatus = "Testing network connection capabilities.";
var testMessage = "Test in progress";
var shouldEnableNatMessage : String = "";
var doneTesting = false;
var probingPublicIP = false;
var serverPort = 9999;
var connectionTestResult = ConnectionTesterStatus.Undetermined;

// Indicates if the useNat parameter be enabled when starting a server
//表示在服务器启动时，useNat参数是否启用
var useNat = false;

function OnGUI() {
	GUILayout.Label("Current Status: " + testStatus);
	GUILayout.Label("Test result : " + testMessage);
	GUILayout.Label(shouldEnableNatMessage);
	if (!doneTesting)
		TestConnection();
}

function TestConnection() {
	// Start/Poll the connection test, report the results in a label and
	// react to the results accordingly
	//开始/轮询连接测试，在标签上显示结果并按照结果做出相应的反应
	connectionTestResult = Network.TestConnection();
	switch (connectionTestResult) {
		case ConnectionTesterStatus.Error:
			testMessage = "Problem determining NAT capabilities";
			doneTesting = true;
			break;

		case ConnectionTesterStatus.Undetermined:
			testMessage = "Undetermined NAT capabilities";
			doneTesting = false;
			break;

		case ConnectionTesterStatus.PublicIPIsConnectable:
			testMessage = "Directly connectable public IP address.";
			useNat = false;
			doneTesting = true;
			break;

		// This case is a bit special as we now need to check if we can
		// circumvent the blocking by using NAT punchthrough
		//这是一个比较特殊的情况，现在需要检查，如果我们可以使用NAT穿透规避阻塞
		case ConnectionTesterStatus.PublicIPPortBlocked:
			testMessage = "Non-connectble public IP address (port " +
			serverPort +" blocked), running a server is impossible.";
			useNat = false;
		// If no NAT punchthrough test has been performed on this public
		// IP, force a test
		//在这个公网IP，如果没有NAT穿透测试被执行，强制测试
		if (!probingPublicIP) {
			connectionTestResult = Network.TestConnectionNAT();
			probingPublicIP = true;
			testStatus = "Testing if blocked public IP can be circumvented";
			timer = Time.time + 10;
		}
		// NAT punchthrough test was performed but we still get blocked
		//NAT穿透测试已经执行，但是我们仍然被阻塞
		else if (Time.time > timer) {
			probingPublicIP = false; // reset 重置
			useNat = true;
			doneTesting = true;
		}
		break;
		case ConnectionTesterStatus.PublicIPNoServerStarted:
			testMessage = "Public IP address but server not initialized, "+
				"it must be started to check server accessibility. Restart "+
				"connection test when ready.";
			break;

		case ConnectionTesterStatus.LimitedNATPunchthroughPortRestricted:
			testMessage = "Limited NAT punchthrough capabilities. Cannot "+
				"connect to all types of NAT servers.";
				useNat = true;
			doneTesting = true;
			break;

		case ConnectionTesterStatus.LimitedNATPunchthroughPortRestricted:
			testMessage = "Limited NAT punchthrough capabilities. Cannot "+
				"connect to all types of NAT servers. Running a server "+
				"is ill advised as not everyone can connect.";
			useNat = true;
			doneTesting = true;
			break;

		case ConnectionTesterStatus.LimitedNATPunchthroughSymmetric:
			testMessage = "Limited NAT punchthrough capabilities. Cannot "+
				"connect to all types of NAT servers. Running a server "+
				"is ill advised as not everyone can connect.";
			useNat = true;
			doneTesting = true;
			break;

		case ConnectionTesterStatus.NATpunchthroughAddressRestrictedCone:
		case ConnectionTesterStatus.NATpunchthroughFullCone:
			testMessage = "NAT punchthrough capable. Can connect to all "+
				"servers and receive connections from all clients. Enabling "+
				"NAT punchthrough functionality.";
			useNat = true;
			doneTesting = true;
			break;

		default:
			testMessage = "Error in test routine, got " + connectionTestResult;
	}
	if (doneTesting) {
		if (useNat)
			shouldEnableNatMessage = "When starting a server the NAT "+
				"punchthrough feature should be enabled (useNat parameter)";
		else
			shouldEnableNatMessage = "NAT punchthrough not needed";
				testStatus = "Done testing";
	}
}