场景
Node-RED简介与Windows上安装、启动和运行示例：
Node-RED简介与Windows上安装、启动和运行示例_霸道流氓气质的博客-CSDN博客_nodered windows
Node-RED怎样导出导入流程为json文件：
Node-RED怎样导出导入流程为json文件_霸道流氓气质的博客-CSDN博客_怎么导出json文件
Node-RED中可以使用tcp in 和 tcp out节点来建立TCP服务端以及TCP客户端。
注：
博客：
霸道流氓气质的博客_CSDN博客-C#,架构之路,SpringBoot领域博主
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实现
1、建立服务端
编辑tcp in节点，类型中选择监听，端口输入1025
输出选择字符流的字符串，分割符号是\m
2、switch节点，新增两条规则，分别判断msg.payload属性值是temp还是humi
3、两个change节点，指定msg.payload属性值分别为20和70的模拟值。
4、template节点，在msg.payload属性值的信息后面加上\n
5、tcp out节点，在类型选择回应TCP
6、TCP客户端布局
7、tcp in节点，在类型选择连接，端口输入1025，输出指定字串流的字符串，分割符号\n
8、function节点，目的是中断流程，避免之后的tcp out节点再输出msg.payload属性值，删除function节点的return msg代码
9、template节点，修改为{{payload}}输出值，别忘了按Enter回车键，才能在字符串后面加上\n
10、json数据
[
{
"id": "f4a4d8eab7935bc8",
"type": "tab",
"label": "流程 3",
"disabled": false,
"info": "",
"env": []
},
{
"id": "c428312d1f6165d1",
"type": "mqtt-broker",
"name": "mqtt",
"broker": "127.0.0.1",
"port": "1883",
"clientid": "",
"autoConnect": true,
"usetls": false,
"protocolVersion": "4",
"keepalive": "60",
"cleansession": true,
"birthTopic": "",
"birthQos": "0",
"birthPayload": "",
"birthMsg": {},
"closeTopic": "",
"closeQos": "0",
"closePayload": "",
"closeMsg": {},
"willTopic": "",
"willQos": "0",
"willPayload": "",
"willMsg": {},
"sessionExpiry": ""
},
{
"id": "51eee50b4ec9422f",
"type": "ui_group",
"name": "dashboardDemo",
"tab": "29ae4c620f43ee0d",
"order": 1,
"disp": true,
"width": "6",
"collapse": false,
"className": ""
},
{
"id": "29ae4c620f43ee0d",
"type": "ui_tab",
"name": "Home",
"icon": "dashboard",
"disabled": false,
"hidden": false
},
{
"id": "a506c767a5c1edbd",
"type": "ui_base",
"theme": {
"name": "theme-light",
"lightTheme": {
"default": "#0094CE",
"baseColor": "#0094CE",
"baseFont": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif",
"edited": true,
"reset": false
},
"darkTheme": {
"default": "#097479",
"baseColor": "#097479",
"baseFont": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif",
"edited": false
},
"customTheme": {
"name": "Untitled Theme 1",
"default": "#4B7930",
"baseColor": "#4B7930",
"baseFont": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif"
},
"themeState": {
"base-color": {
"default": "#0094CE",
"value": "#0094CE",
"edited": false
},
"page-titlebar-backgroundColor": {
"value": "#0094CE",
"edited": false
},
"page-backgroundColor": {
"value": "#fafafa",
"edited": false
},
"page-sidebar-backgroundColor": {
"value": "#ffffff",
"edited": false
},
"group-textColor": {
"value": "#1bbfff",
"edited": false
},
"group-borderColor": {
"value": "#ffffff",
"edited": false
},
"group-backgroundColor": {
"value": "#ffffff",
"edited": false
},
"widget-textColor": {
"value": "#111111",
"edited": false
},
"widget-backgroundColor": {
"value": "#0094ce",
"edited": false
},
"widget-borderColor": {
"value": "#ffffff",
"edited": false
},
"base-font": {
"value": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif"
}
},
"angularTheme": {
"primary": "indigo",
"accents": "blue",
"warn": "red",
"background": "grey",
"palette": "light"
}
},
"site": {
"name": "Node-RED Dashboard",
"hideToolbar": "false",
"allowSwipe": "false",
"lockMenu": "false",
"allowTempTheme": "true",
"dateFormat": "DD/MM/YYYY",
"sizes": {
"sx": 48,
"sy": 48,
"gx": 6,
"gy": 6,
"cx": 6,
"cy": 6,
"px": 0,
"py": 0
}
}
},
{
"id": "248cbbb0.18e794",
"type": "ui_group",
"name": "MyGroup",
"tab": "3f79c420.cfc1bc",
"order": 1,
"disp": true,
"width": "6",
"collapse": false
},
{
"id": "3f79c420.cfc1bc",
"type": "ui_tab",
"name": "Home",
"icon": "dashboard",
"disabled": false,
"hidden": false
},
{
"id": "a0954be5.a7f7e8",
"type": "ui_group",
"name": "MyInput",
"tab": "3f79c420.cfc1bc",
"order": 2,
"disp": true,
"width": "6",
"collapse": false
},
{
"id": "508bd6f8398ab80f",
"type": "ui_group",
"name": "OpenWeatherMap",
"tab": "3f79c420.cfc1bc",
"order": 3,
"disp": true,
"width": "6",
"collapse": false
},
{
"id": "4843765b.1af508",
"type": "tcp in",
"z": "f4a4d8eab7935bc8",
"name": "TCP客戶端:1025",
"server": "client",
"host": "127.0.0.1",
"port": "1025",
"datamode": "stream",
"datatype": "utf8",
"newline": "\\n",
"topic": "",
"base64": false,
"x": 240,
"y": 380,
"wires": [
[
"a4f8ed1e.c28a3",
"884f79cc.ff01d8"
]
]
},
{
"id": "a4f8ed1e.c28a3",
"type": "debug",
"z": "f4a4d8eab7935bc8",
"name": "tcp client",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "payload",
"targetType": "msg",
"statusVal": "",
"statusType": "auto",
"x": 420,
"y": 440,
"wires": []
},
{
"id": "27457a99.3109b6",
"type": "tcp out",
"z": "f4a4d8eab7935bc8",
"host": "",
"port": "",
"beserver": "reply",
"base64": false,
"end": false,
"name": "tcp out : 送出信息",
"x": 650,
"y": 380,
"wires": []
},
{
"id": "1a88d1d5.c129ae",
"type": "inject",
"z": "f4a4d8eab7935bc8",
"name": "",
"props": [
{
"p": "payload"
},
{
"p": "topic",
"vt": "str"
}
],
"repeat": "",
"crontab": "",
"once": false,
"onceDelay": 0.1,
"topic": "",
"payload": "temp",
"payloadType": "str",
"x": 410,
"y": 340,
"wires": [
[
"f1c7c3d.6a92c4"
]
]
},
{
"id": "884f79cc.ff01d8",
"type": "function",
"z": "f4a4d8eab7935bc8",
"name": "no msg back",
"func": "",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 430,
"y": 380,
"wires": [
[
"27457a99.3109b6"
]
]
},
{
"id": "d0ed337.b37dbd",
"type": "tcp in",
"z": "f4a4d8eab7935bc8",
"name": "TCP服务端:1025",
"server": "server",
"host": "",
"port": "1025",
"datamode": "stream",
"datatype": "utf8",
"newline": "\\n",
"topic": "",
"base64": false,
"x": 220,
"y": 100,
"wires": [
[
"a8ca6d2c.2926c",
"c3baaed4.79a65"
]
]
},
{
"id": "c4fce4d0.df1838",
"type": "tcp out",
"z": "f4a4d8eab7935bc8",
"host": "",
"port": "",
"beserver": "reply",
"base64": false,
"end": false,
"name": "tcp out: 发送信息",
"x": 770,
"y": 160,
"wires": []
},
{
"id": "a6a1d927.3f5878",
"type": "inject",
"z": "f4a4d8eab7935bc8",
"name": "",
"props": [
{
"p": "payload"
},
{
"p": "topic",
"vt": "str"
}
],
"repeat": "",
"crontab": "",
"once": false,
"onceDelay": "",
"topic": "",
"payload": "Hello from server.",
"payloadType": "str",
"x": 560,
"y": 40,
"wires": [
[
"df1d0ca7.57683"
]
]
},
{
"id": "a8ca6d2c.2926c",
"type": "debug",
"z": "f4a4d8eab7935bc8",
"name": "tcp server",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "payload",
"targetType": "msg",
"statusVal": "",
"statusType": "auto",
"x": 400,
"y": 160,
"wires": []
},
{
"id": "c3baaed4.79a65",
"type": "switch",
"z": "f4a4d8eab7935bc8",
"name": "",
"property": "payload",
"propertyType": "msg",
"rules": [
{
"t": "eq",
"v": "temp",
"vt": "str"
},
{
"t": "eq",
"v": "humi",
"vt": "str"
}
],
"checkall": "true",
"repair": false,
"outputs": 2,
"x": 390,
"y": 100,
"wires": [
[
"9986631d.c94df"
],
[
"862b30b1.af802"
]
]
},
{
"id": "9986631d.c94df",
"type": "change",
"z": "f4a4d8eab7935bc8",
"name": "输出: 20",
"rules": [
{
"t": "set",
"p": "payload",
"pt": "msg",
"to": "20",
"tot": "num"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 540,
"y": 80,
"wires": [
[
"df1d0ca7.57683"
]
]
},
{
"id": "f1c7c3d.6a92c4",
"type": "template",
"z": "f4a4d8eab7935bc8",
"name": "+ 換行",
"field": "payload",
"fieldType": "msg",
"format": "handlebars",
"syntax": "mustache",
"template": "{{payload}}\n",
"output": "str",
"x": 550,
"y": 320,
"wires": [
[
"27457a99.3109b6"
]
]
},
{
"id": "2ddba953.d7ae06",
"type": "inject",
"z": "f4a4d8eab7935bc8",
"name": "",
"props": [
{
"p": "payload"
},
{
"p": "topic",
"vt": "str"
}
],
"repeat": "",
"crontab": "",
"once": false,
"onceDelay": 0.1,
"topic": "",
"payload": "humi",
"payloadType": "str",
"x": 410,
"y": 300,
"wires": [
[
"f1c7c3d.6a92c4"
]
]
},
{
"id": "862b30b1.af802",
"type": "change",
"z": "f4a4d8eab7935bc8",
"name": "输出: 70",
"rules": [
{
"t": "set",
"p": "payload",
"pt": "msg",
"to": "70",
"tot": "num"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 540,
"y": 120,
"wires": [
[
"df1d0ca7.57683"
]
]
},
{
"id": "df1d0ca7.57683",
"type": "template",
"z": "f4a4d8eab7935bc8",
"name": "+换行",
"field": "payload",
"fieldType": "msg",
"format": "handlebars",
"syntax": "mustache",
"template": "{{payload}}\n",
"output": "str",
"x": 690,
"y": 100,
"wires": [
[
"c4fce4d0.df1838"
]
]
}
]11、效果
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