@droneblocks/node-red-dexi/flows/led_rainbow.json

You want to make sure you don't lose any of your flow development. Make sure to map the host "flows" directory to the container directory as shown below. This will store the flow on your host machine if/when the container is destroyed.

[
    {
        "id": "74c581da26fc6718",
        "type": "tab",
        "label": "LED Rainbow",
        "disabled": false,
        "info": "",
        "env": []
    },
    {
        "id": "675128322ff4eaff",
        "type": "led",
        "z": "74c581da26fc6718",
        "name": "Black",
        "color": "black",
        "x": 630,
        "y": 240,
        "wires": [
            [
                "8ad483bb979248b3"
            ]
        ]
    },
    {
        "id": "8ad483bb979248b3",
        "type": "ros2-service-call",
        "z": "74c581da26fc6718",
        "server": "27129f80a96ce509",
        "x": 840,
        "y": 260,
        "wires": [
            [
                "0809a76f90b63919"
            ]
        ]
    },
    {
        "id": "7d0e9e5c3ff1afdc",
        "type": "led-pixel",
        "z": "74c581da26fc6718",
        "ledindex": "0",
        "red": "",
        "green": "",
        "blue": "",
        "x": 640,
        "y": 300,
        "wires": [
            [
                "8ad483bb979248b3"
            ]
        ]
    },
    {
        "id": "6870dd1e4a7f49aa",
        "type": "function",
        "z": "74c581da26fc6718",
        "name": "rainbow",
        "func": "let current_index = flow.get(\"current_index\") || 0;\n\n// Define RGB values for ROYGBIV colors\nconst colors = [\n    {red: 255, green: 0, blue: 0},      // Red\n    {red: 255, green: 127, blue: 0},    // Orange\n    {red: 255, green: 255, blue: 0},    // Yellow\n    {red: 0, green: 255, blue: 0},      // Green\n    {red: 0, green: 0, blue: 255},      // Blue\n    {red: 75, green: 0, blue: 130},     // Indigo\n    {red: 148, green: 0, blue: 211}     // Violet\n];\n\nconst shuffledColors = colors.sort((a, b) => 0.5 - Math.random());\n\n// Map the current index to a color from the ROYGBIV array\nlet color_index = current_index % colors.length\n\nlet pixel_color = shuffledColors[color_index];\n\n// Set the pixel object with the corresponding color\nlet pixel = {\n    index: current_index,\n    red: pixel_color.red,\n    green: pixel_color.green,\n    blue: pixel_color.blue\n};\n\nmsg.payload = pixel;\n\n// Increment the pixel counter\nif (current_index < 43) {\n    current_index = current_index + 1;\n} else {\n    current_index = 0;  // Loop back to the beginning after reaching the last pixel\n}\n\n// Store the current index for the next iteration\nflow.set(\"current_index\", current_index);\n\nreturn msg;\n",
        "outputs": 1,
        "timeout": 0,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 320,
        "y": 260,
        "wires": [
            [
                "8511d7e87a7aecf4"
            ]
        ]
    },
    {
        "id": "583bfc15594b10af",
        "type": "inject",
        "z": "74c581da26fc6718",
        "name": "start animation",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 160,
        "y": 200,
        "wires": [
            [
                "6870dd1e4a7f49aa"
            ]
        ]
    },
    {
        "id": "0809a76f90b63919",
        "type": "delay",
        "z": "74c581da26fc6718",
        "name": "",
        "pauseType": "delay",
        "timeout": "50",
        "timeoutUnits": "milliseconds",
        "rate": "1",
        "nbRateUnits": "1",
        "rateUnits": "second",
        "randomFirst": "1",
        "randomLast": "5",
        "randomUnits": "seconds",
        "drop": false,
        "allowrate": false,
        "outputs": 1,
        "x": 490,
        "y": 420,
        "wires": [
            [
                "6870dd1e4a7f49aa"
            ]
        ]
    },
    {
        "id": "8511d7e87a7aecf4",
        "type": "switch",
        "z": "74c581da26fc6718",
        "name": "",
        "property": "current_index",
        "propertyType": "flow",
        "rules": [
            {
                "t": "eq",
                "v": "43",
                "vt": "num"
            },
            {
                "t": "else"
            }
        ],
        "checkall": "true",
        "repair": false,
        "outputs": 2,
        "x": 470,
        "y": 260,
        "wires": [
            [
                "675128322ff4eaff"
            ],
            [
                "7d0e9e5c3ff1afdc"
            ]
        ]
    },
    {
        "id": "27129f80a96ce509",
        "type": "ros2-websocket-server",
        "url": "ws://192.168.4.1:9090"
    }
]