NodeRED学习（七）MQTT/Modbus网关_node-red对接传感器

简述：

用Node-RED 搭建一个MQTT网关，网关通过Modbus总线连接一个水位传感器和一个温度传感器，采集水位和温度数据，再通过MQTT客户端把水位和温度信息发布到MQTT代理。

网关：

协议转化：网关可以通过Modbus总线把多个485串口的传感器，以轮询的方式采集，通过MQTT协议发布给信息平台。
信息汇聚：网关可以把多个传感器数据，聚合为一个对象，为数据附加语义描述，使信息具有结构化，易可识别。
虚拟串口软件VSPD配置两对虚拟串口：

Modbus Slave模拟两个传感器：

配置MQTT代理：

通过Modbus分别采集水箱的水位和温度，合并为水箱参数，由MQTT客户端发布：

添加注入(inject)节点和延迟(delay)节点配置轮询：

添加函数节点，为消息添加主题：

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        "type": "tab",
        "label": "流程 2",
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        "info": "",
        "env": []
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        "type": "modbus-getter",
        "z": "47697d9d8a564c16",
        "name": "水位",
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        "showErrors": false,
        "logIOActivities": false,
        "unitid": "1",
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        "adr": "0",
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    {
        "id": "36e7a1c989d23266",
        "type": "inject",
        "z": "47697d9d8a564c16",
        "name": "",
        "props": [
            {
                "p": "payload"
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            {
                "p": "topic",
                "vt": "str"
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        "repeat": "5",
        "crontab": "",
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        "type": "debug",
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        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
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        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
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        "y": 380,
        "wires": []
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        "id": "cb911d4fa59973ac",
        "type": "delay",
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        "name": "",
        "pauseType": "delay",
        "timeout": "10",
        "timeoutUnits": "milliseconds",
        "rate": "1",
        "nbRateUnits": "1",
        "rateUnits": "second",
        "randomFirst": "1",
        "randomLast": "5",
        "randomUnits": "seconds",
        "drop": false,
        "allowrate": false,
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        "name": "水位",
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        "outputs": 1,
        "noerr": 0,
        "initialize": "",
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        "name": "水温",
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        "outputs": 1,
        "noerr": 0,
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        "wires": [
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        "name": "",
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        "qos": "0",
        "retain": "false",
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        "mqtt_port": 1883,
        "mqtt_ws_bind": "port",
        "mqtt_ws_port": "",
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        "dburl": "",
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    {
        "id": "5323672ec49be0fd",
        "type": "mqtt in",
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        "name": "",
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        "qos": "0",
        "datatype": "auto-detect",
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        "nl": false,
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        "rh": 0,
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        "joiner": "\\n",
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        "serialConnectionDelay": "100",
        "serialAsciiResponseStartDelimiter": "0x3A",
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        "tcpType": "DEFAULT",
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        "commandDelay": "1",
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        "sessionExpiry": ""
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]
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