数字孪生的搭建，并利用mqtt实现物联网设备通信、控制

1.unity 使用C#脚本实现MQTT通信

(6条消息) MQTT学习（四）--使用m2mqtt在Unity3D中实现MQTT客户端_lordwish的专栏-CSDN博客

C#代码如下：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Net;
using System.Text;
using uPLibrary.Networking.M2Mqtt;
using uPLibrary.Networking.M2Mqtt.Messages;

public class Move : MonoBehaviour
{
private MqttClient client;

void Start()
{
    client = new MqttClient("your_ip");
    client.Connect("user_name");
    client.Subscribe(new string[] { "topic" }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
    client.Subscribe(new string[] { "xsd" }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
    client.MqttMsgPublishReceived += Client_MqttMsgPublishReceived;
}

// Update is called once per frame
void Update()
{
    if (Input.GetKey(KeyCode.P))
    {
        client.Publish("xsd", Encoding.UTF8.GetBytes("VW180 = 1")); 
        print("已发送开锁信息指令");
    }
}
private void Client_MqttMsgPublishReceived(object sender, MqttMsgPublishEventArgs e)
{
    string tmp = System.Text.Encoding.UTF8.GetString(e.Message);
    Debug.Log("实时信息反馈" + tmp);
}

}

2.unity 场景搭建资源

(6条消息) Unity免费的优质场景资源_wzpddh的博客-CSDN博客_unity场景

人气免费资源 - Asset Store (unity.com)

3.第三人称小车控制

unity第三人称控制器教程_哔哩哔哩_bilibili

导入官方资源包即可。注意在windows-pakage manager中下载导入。在别的包类型管理中可导入别的系统包。

4.遇到的问题

4.1子线程无法访问主线程

将对unity中物体属性的修改应该放到Updata（）等默认执行线程中，代码如下

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using System.Net;
using System.Text;
using uPLibrary.Networking.M2Mqtt;
using uPLibrary.Networking.M2Mqtt.Messages;

public class LOCKUI : MonoBehaviour
{
public Button button_lock;
public GameObject panel_lock;
public Button button_exit;
public Text text;
private MqttClient client;
public string message;

//public Text realtime_info;
// Start is called before the first frame update
private void Start()
{
    button_lock.onClick.AddListener(button_lock_Click);
    button_exit.onClick.AddListener(button_exit_Click);
    client = new MqttClient("your_ip");
    print(client.Connect("user_name"));
    client.Subscribe(new string[] { "xsd" }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
    client.MqttMsgPublishReceived += Client_MqttMsgPublishReceived;
    client.Subscribe(new string[] { "test" }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
}
private void Client_MqttMsgPublishReceived(object sender, MqttMsgPublishEventArgs e)
{
    message = System.Text.Encoding.UTF8.GetString(e.Message);
    Debug.Log("实时信息反馈" + message);
}


private void button_lock_Click()
{
    client.Publish("xsd", Encoding.UTF8.GetBytes("VW180 = 1"));
    message = "已发送开锁信息指令";
}
private void button_exit_Click()
{
    panel_lock.SetActive(false);
}

private void Update()
{
    text.text = message;
}

}

4.2 物体属性无法修改

注意脚本生命周期中默认执行函数的大小写！！！

4.3可以发送mqtt消息，但无法打开柜子

柜子网关配置连接异常

4.4world space模式下的canvas调整大小

一般调整像素大小以适应场景。画布拥有的是Rectangle Transform

4.5list map形式的字符串转list map格式

使用Json.NET - Newtonsoft，但是通过VS包管理器导入后不支持unity。由于unity（目前是用unity5.5）目前最高支持.net framework 版本是3.5，所以无法直接通过NuGet导入Newtonsoft.Json来使用。可以访问GitHub下载相应的支持Unity的Newtonsoft.Json资源包，导入即可使用。(https://github.com/SaladLab/Json.Net.Unity3D/releases)

{"DeviceID":"121211","guanhao1":"1","height_data1":"19069","temp1":"197","hum1":"612","dp1":"125","guanhao2":"2","height_data2":"8652","temp2":"197","hum2":"612","dp2":"125","guanhao3":"3","height_data3":"29060","temp3":"197","hum3":"612","dp3":"125","guanhao4":"4","height_data4":"8602","temp4":"197","hum4":"612","dp4":"125","guanhao5":"5","height_data5":"8605","temp5":"197","hum5":"612","dp5":"125","guanhao6":"6","height_data6":"10000","temp6":"197","hum6":"612","dp6":"125","guanhao7":"7","height_data7":"23863","temp7":"197","hum7":"612","dp7":"125","guanhao8":"8","height_data8":"0","temp8":"197","hum8":"612","dp8":"125","Lock9":"9","StateOn_Off9":"1","temp9":"197","hum9":"612","dp9":"125"}

导入后使用Var Object = JsonConvert.DeserializeObject(json);要先创建自定义CharacterListItem类，类的形式与传入数据格式有关。

public class CharacterListItem
{
public int Id { get; set; }
public string Name { get; set; }
public int Level { get; set; }
public string Class { get; set; }
public string Sex { get; set; }
}

4.6 GUI无法触发

脚本依附的GUI上层还有别的GUI， OnMouseDown不可以触发

4.7eventTrigger

给对应UI添加eventTrigger组件，拖动绑定物体，绑定物体中脚本里的函数（需要public）

4.8使用UMP读取rtmp流

(11条消息) Unity3d使用UMP插件播放网络视频流（rtsp、rtmp、onvif）_zouxin_88的专栏-CSDN博客

1.下载资源包并导入。将Assets\UniversalMediaPlayer\Prefabs\UniversalMediaPlayer.prefab拖入到场景中。

2.在UI的Canvas下创建RawImage，并添加ARVideoCanvasHelper组件。
在RawImage组件中，将Material设为为ARVideoCanvasMaterial。
在ARVideoCanvasHelper组件中， 将MediaPlayer设为UniversalMediaPlayer
3.选中UniversalMediaPlayer，在UniversalMediaPlayer组件中，设置Renddering GameObjects数组，个数为1，Elelement 0为RawImage。填入Path to video file为播放地址。

4.9使用高级UI-Xcharts

GitHub - monitor1394/unity-ugui-XCharts: A charting and data visualization library for Unity. 一款基于UGUI的数据可视化图表插件。