Node-RED中建立TCP服务端和客户端

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：
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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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