Feinstaubsensor -> MQTT bridge in node-red

mqtt-bridge.json

[
    {
        "id": "54ce3785.15e3a8",
        "type": "tab",
        "label": "Feinstaubsensor -> MQTT",
        "disabled": false,
        "info": "Feinstaubsensor postet auf eine HTTP API, die wiederum \nauf den MQTT Broker pusht"
    },
    {
        "id": "f2e33c93.125fc",
        "type": "http in",
        "z": "54ce3785.15e3a8",
        "name": "API Endpoint",
        "url": "/feinstaub",
        "method": "post",
        "upload": false,
        "swaggerDoc": "",
        "x": 90,
        "y": 40,
        "wires": [
            [
                "1eb04616.1999aa",
                "24f21ce1.263f84"
            ]
        ]
    },
    {
        "id": "ef5425.e58c2bd8",
        "type": "http response",
        "z": "54ce3785.15e3a8",
        "name": "Respond HTTP 200",
        "statusCode": "200",
        "headers": {},
        "x": 610,
        "y": 40,
        "wires": []
    },
    {
        "id": "1eb04616.1999aa",
        "type": "template",
        "z": "54ce3785.15e3a8",
        "name": "Content for Response",
        "field": "payload",
        "fieldType": "msg",
        "format": "handlebars",
        "syntax": "mustache",
        "template": "OK",
        "output": "str",
        "x": 340,
        "y": 40,
        "wires": [
            [
                "ef5425.e58c2bd8"
            ]
        ]
    },
    {
        "id": "24f21ce1.263f84",
        "type": "jsonpath",
        "z": "54ce3785.15e3a8",
        "expression": "$.sensordatavalues.*",
        "split": false,
        "name": "Extract sensordatavalues",
        "x": 350,
        "y": 100,
        "wires": [
            [
                "d0a267a1.157588"
            ]
        ]
    },
    {
        "id": "e416a8b5.7b3828",
        "type": "function",
        "z": "54ce3785.15e3a8",
        "name": "Merge value_type and value",
        "func": "payload = msg.payload;\ntype = payload.value_type;\nvalue = payload.value;\nreturn {topic: type, payload: value}\n",
        "outputs": 1,
        "noerr": 0,
        "x": 940,
        "y": 100,
        "wires": [
            [
                "a8474572.c39458"
            ]
        ]
    },
    {
        "id": "d0a267a1.157588",
        "type": "splitter",
        "z": "54ce3785.15e3a8",
        "name": "Iterate over measurements",
        "property": "payload",
        "x": 640,
        "y": 100,
        "wires": [
            [
                "e416a8b5.7b3828"
            ]
        ]
    },
    {
        "id": "a8474572.c39458",
        "type": "template",
        "z": "54ce3785.15e3a8",
        "name": "Modify topic",
        "field": "topic",
        "fieldType": "msg",
        "format": "handlebars",
        "syntax": "mustache",
        "template": "feinstaub/{{topic}}",
        "output": "str",
        "x": 1190,
        "y": 100,
        "wires": [
            [
                "df6fbd1d.bc7f2"
            ]
        ]
    },
    {
        "id": "df6fbd1d.bc7f2",
        "type": "mqtt out",
        "z": "54ce3785.15e3a8",
        "name": "Send to MQTT",
        "topic": "",
        "qos": "1",
        "retain": "true",
        "broker": "b6376b41.3b0508",
        "x": 1400,
        "y": 100,
        "wires": []
    },
    {
        "id": "b6376b41.3b0508",
        "type": "mqtt-broker",
        "z": "",
        "broker": "localhost",
        "port": "1883",
        "clientid": "",
        "usetls": false,
        "compatmode": true,
        "keepalive": "60",
        "cleansession": true,
        "willTopic": "node-red/status",
        "willQos": "1",
        "willRetain": "true",
        "willPayload": "offline",
        "birthTopic": "node-red/status",
        "birthQos": "1",
        "birthRetain": "true",
        "birthPayload": "online"
    }
]