NodeRED Blog https://iqfareez.com/blog/get-started-on-iot-with-nodered-esp32

flows.json

[
    {
        "id": "4bca563ec5ca0cdd",
        "type": "tab",
        "label": "Flow 1",
        "disabled": false,
        "info": "",
        "env": []
    },
    {
        "id": "c6613b3144ea8d8c",
        "type": "mqtt in",
        "z": "4bca563ec5ca0cdd",
        "name": "",
        "topic": "mynode/led1",
        "qos": "2",
        "datatype": "auto-detect",
        "broker": "ae87560b394eafc3",
        "nl": false,
        "rap": true,
        "rh": 0,
        "inputs": 0,
        "x": 250,
        "y": 200,
        "wires": [
            [
                "377228ce24312140"
            ]
        ]
    },
    {
        "id": "377228ce24312140",
        "type": "ui_text",
        "z": "4bca563ec5ca0cdd",
        "group": "e7203da337e334e0",
        "order": 0,
        "width": 0,
        "height": 0,
        "name": "",
        "label": "LED Status",
        "format": "{{msg.payload}}",
        "layout": "row-spread",
        "className": "",
        "x": 470,
        "y": 200,
        "wires": []
    },
    {
        "id": "ae87560b394eafc3",
        "type": "mqtt-broker",
        "name": "",
        "broker": "broker.hivemq.com",
        "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": {},
        "userProps": "",
        "sessionExpiry": ""
    },
    {
        "id": "e7203da337e334e0",
        "type": "ui_group",
        "name": "Default",
        "tab": "7758eaf739af74c6",
        "order": 1,
        "disp": true,
        "width": "6",
        "collapse": false,
        "className": ""
    },
    {
        "id": "7758eaf739af74c6",
        "type": "ui_tab",
        "name": "Home",
        "icon": "dashboard",
        "disabled": false,
        "hidden": false
    }
]