Example - Kauf Tasmota Smart Bulb

[glasscake]

This is an RGBWW or RGWCCT bulb that comes preflashed with ESP home, you can over the air flash it with tasmota and use the default config provided by Kaufman to have an RGB bulb with white blend mode.
https://kaufha.com/blf10/
https://www.amazon.com/dp/B0B3SCKQNL?psc=1&ref=ppx_yo2ov_dt_b_product_details

~~Unfortunately, because homekit does not have separate outputs for the cool white/warm white or color temperature channel there is a secondary service bulb that controls the temperature based on its brightness. ~~
As of 1/29/24, This has been updated to use a single lightbulb object with color temperature, thanks Christopher Aitken for the recommendation!

You may have to play with the trigger delay timer depending on how fast your network/nodered is when scrolling around in the RGB settings if the delay is set too low it will get locked in a loop flashing between two colors.

example flow:

[
    {
        "id": "5edeeab193cb3228",
        "type": "function",
        "z": "06e5f3211441d2c9",
        "name": "MQTT To HomeKit ",
        "func": "\n\nmsg.mqtt = msg.payload;\nmsg.payload={\n    \"On\":msg.mqtt.POWER,\n    'Brightness': msg.mqtt.Dimmer,\n    'Hue': msg.mqtt.Hue,\n    'Saturation': msg.mqtt.Saturation,\n    'ColorTemperature': msg.mqtt.CT\n}\n\n\nreturn msg;\n",
        "outputs": 1,
        "timeout": "",
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 770,
        "y": 940,
        "wires": [
            [
                "79a50f9cbd34d4f9"
            ]
        ]
    },
    {
        "id": "e7027d644369d9c5",
        "type": "mqtt in",
        "z": "06e5f3211441d2c9",
        "name": "",
        "topic": "stat/Bulb1/RESULT",
        "qos": "2",
        "datatype": "auto-detect",
        "broker": "",
        "nl": false,
        "rap": true,
        "rh": 0,
        "inputs": 0,
        "x": 150,
        "y": 960,
        "wires": [
            [
                "b0dca9aa32759d77"
            ]
        ]
    },
    {
        "id": "79a50f9cbd34d4f9",
        "type": "homekit-service",
        "z": "06e5f3211441d2c9",
        "isParent": true,
        "hostType": "0",
        "bridge": "db564225372205c8",
        "accessoryId": "",
        "parentService": "",
        "name": "Bulb1-rgb",
        "serviceName": "Lightbulb",
        "topic": "",
        "filter": false,
        "manufacturer": "NRCHKB",
        "model": "1.5.0",
        "serialNo": "Default Serial Number",
        "firmwareRev": "1.5.0",
        "hardwareRev": "1.5.0",
        "softwareRev": "1.5.0",
        "cameraConfigVideoProcessor": "ffmpeg",
        "cameraConfigSource": "",
        "cameraConfigStillImageSource": "",
        "cameraConfigMaxStreams": 2,
        "cameraConfigMaxWidth": 1280,
        "cameraConfigMaxHeight": 720,
        "cameraConfigMaxFPS": 10,
        "cameraConfigMaxBitrate": 300,
        "cameraConfigVideoCodec": "libx264",
        "cameraConfigAudioCodec": "libfdk_aac",
        "cameraConfigAudio": false,
        "cameraConfigPacketSize": 1316,
        "cameraConfigVerticalFlip": false,
        "cameraConfigHorizontalFlip": false,
        "cameraConfigMapVideo": "0:0",
        "cameraConfigMapAudio": "0:1",
        "cameraConfigVideoFilter": "scale=1280:720",
        "cameraConfigAdditionalCommandLine": "-tune zerolatency",
        "cameraConfigDebug": false,
        "cameraConfigSnapshotOutput": "disabled",
        "cameraConfigInterfaceName": "",
        "characteristicProperties": "{\"Brightness\":true,\"Hue\":true,\"Saturation\":true,\"ColorTemperature\":true}",
        "waitForSetupMsg": false,
        "outputs": 2,
        "x": 1000,
        "y": 940,
        "wires": [
            [
                "63a9c1d846a85345"
            ],
            []
        ]
    },
    {
        "id": "1c6ae6067873353a",
        "type": "function",
        "z": "06e5f3211441d2c9",
        "name": "Block",
        "func": "//block all messages until the device has updated itself\n//this also stops loops and other odd issues\n\n//initalize into passing\nif (context.get('blocking') == null) {\n    node.status({ fill: \"green\", shape: \"dot\", text: \"passing\" });\n    context.set('blocking', false)\n    return null\n}\n\n\n/* the acceptable values are\n{\"On\":bool,\"Brightness\":int,\"Hue\":int,\"Saturation\":int}\n*/\n\n\n//is this a homekit message\nif (msg.payload.type == 1)\n{\n    //that means the homekit service is sending data to the device\n    //block all messages untill the device responds on mqtt\n    context.set('blocking', true)\n    //save what the message was so we confirm it is correct. We need to get all parameters back from the node and MQTT\n    context.set('POWER', msg.payload.POWER)\n    context.set('brightness', msg.payload.Brightness)\n    context.set('Hue', msg.payload.Hue)\n    context.set('Saturation', msg.payload.Saturation)\n    context.set('CT', msg.payload.CT)\n\n    node.status({ fill: \"red\", shape: \"dot\", text: \"blocking\" });\n    return null\n}\n\nif (msg.payload.type == 0)\n{\n    //this is an mqtt response, lets see if the response matches the set status\n    //get all of the varables\n    var previous = \n    { \n        'POWER': context.get('POWER'),\n        'brightness':context.get('brightness'),\n        'Hue':context.get('Hue'),\n        'Saturation':context.get('Saturation'),\n        'CT': context.get('CT')\n    }\n    var current = {\n        'POWER': msg.payload.POWER,\n        'brightness': msg.payload.Brightness,\n        'Hue': msg.payload.Hue,\n        'Saturation':msg.payload.Saturation,\n        'CT': msg.payload.CT\n    }\n\n    if(\n        previous.POWER == current.POWER && //\n        previous.brightness == current.brightness && //\n        previous.Hue == current.Hue && // \n        previous.Saturation == current.Saturation &&\n        previous.CT == current.CT\n        )\n        {\n            //only update the blocking when all of the above are true\n            context.set('blocking', false)\n            node.status({ fill: \"green\", shape: \"dot\", text: \"passing\" });\n            //drop the blocking message to not create a loop\n            return [null, { 'payload': { 'Passed':null,previous, current} }]\n        }\n\n}\n\n\n//get the current blocking state\nvar blocking = context.get('blocking')\n\nif (blocking == true)\n{\n    return [null, { 'payload': {'Failed':null, previous, current} }]\n}\n\nreturn [msg, { 'payload': { 'Passed':null,previous, current} }]",
        "outputs": 2,
        "timeout": "",
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 570,
        "y": 960,
        "wires": [
            [
                "5edeeab193cb3228"
            ],
            [
                "f07ee72b0aedd978"
            ]
        ]
    },
    {
        "id": "e75e9b5a43d40f03",
        "type": "function",
        "z": "06e5f3211441d2c9",
        "name": "Set Type",
        "func": "//let the block know this is an mqtt message\n\nmsg.payload.type = 0\nreturn msg;",
        "outputs": 1,
        "timeout": "",
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 380,
        "y": 960,
        "wires": [
            [
                "1c6ae6067873353a"
            ]
        ]
    },
    {
        "id": "289c4aa52bfd09db",
        "type": "function",
        "z": "06e5f3211441d2c9",
        "name": "Set Type",
        "func": "//let the block know if this is a homekit message\n\nmsg.payload.type = 1\nreturn msg;",
        "outputs": 1,
        "timeout": "",
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 780,
        "y": 1040,
        "wires": [
            [
                "1c6ae6067873353a"
            ]
        ]
    },
    {
        "id": "6201c943c8327835",
        "type": "comment",
        "z": "06e5f3211441d2c9",
        "name": "Tasmota Config",
        "info": "{\"NAME\":\"Kauf Bulb\", \"GPIO\":[0,0,0,0,416,419,0,0,417,420,418,0,0,0], \"FLAG\":0, \"BASE\":18, \"CMND\":\"SO105 1|RGBWWTable 204,204,122,153,153\"}",
        "x": 940,
        "y": 900,
        "wires": []
    },
    {
        "id": "18f93485069ba98f",
        "type": "homekit-status",
        "z": "06e5f3211441d2c9",
        "serviceNodeId": "6dc57dfc9fedd14f",
        "name": "",
        "outputs": 1,
        "x": 1390,
        "y": 940,
        "wires": [
            [
                "2a1ea77408aa649f"
            ]
        ]
    },
    {
        "id": "2a1ea77408aa649f",
        "type": "function",
        "z": "06e5f3211441d2c9",
        "name": "Get Important",
        "func": "\n//fix that scaling\n\nvar ct = (msg.payload.characteristics[5].value - 140) / (500 - 140) * (500 - 155) + 155;\nct = Math.round(ct)\nvar POWER = msg.payload.characteristics[1].value\nvar Brightness = 0\nif (POWER != false)\n{\n    Brightness = msg.payload.characteristics[2].value\n}\n\nvar important = {\n    'payload':{\n        'POWER': POWER,\n        'Brightness': Brightness,\n        'Hue':msg.payload.characteristics[3].value,\n        'Saturation':msg.payload.characteristics[4].value,\n        'CT': ct\n    }\n}\n\n\n\n\n\n\n\nreturn important;",
        "outputs": 1,
        "timeout": 0,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 1120,
        "y": 1000,
        "wires": [
            [
                "289c4aa52bfd09db",
                "716c401fa7d447a6"
            ]
        ]
    },
    {
        "id": "b0dca9aa32759d77",
        "type": "function",
        "z": "06e5f3211441d2c9",
        "name": "Split HSB",
        "func": "\nif(msg.payload.HSBColor == null)\n{\n    return null\n}\nvar HSBColor = msg.payload.HSBColor.split(\",\")\n\nvar power = false\nif (msg.payload.POWER == \"ON\") {\n    power = true\n}\n\n//dimmer and brightness seem to always be the same\nvar important = {\n    'payload':{\n        'POWER':power,\n        'Dimmer':msg.payload.Dimmer,\n        'Hue': parseInt(HSBColor[0]),\n        'Saturation': parseInt(HSBColor[1]),\n        'Brightness': parseInt(HSBColor[2]),\n        'CT':msg.payload.CT\n    }\n}\n\n\n\nreturn important;",
        "outputs": 1,
        "timeout": 0,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 380,
        "y": 920,
        "wires": [
            [
                "e75e9b5a43d40f03"
            ]
        ]
    },
    {
        "id": "63a9c1d846a85345",
        "type": "trigger",
        "z": "06e5f3211441d2c9",
        "name": "",
        "op1": "",
        "op2": "",
        "op1type": "date",
        "op2type": "nul",
        "duration": "1",
        "extend": true,
        "overrideDelay": false,
        "units": "ms",
        "reset": "",
        "bytopic": "all",
        "topic": "topic",
        "outputs": 1,
        "x": 1190,
        "y": 940,
        "wires": [
            [
                "18f93485069ba98f"
            ]
        ]
    },
    {
        "id": "f07ee72b0aedd978",
        "type": "debug",
        "z": "06e5f3211441d2c9",
        "name": "debug 20",
        "active": false,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 560,
        "y": 1060,
        "wires": []
    },
    {
        "id": "d95c2601a8314296",
        "type": "mqtt out",
        "z": "06e5f3211441d2c9",
        "name": "",
        "topic": "cmnd/Bulb1/Power",
        "qos": "",
        "retain": "",
        "respTopic": "",
        "contentType": "",
        "userProps": "",
        "correl": "",
        "expiry": "",
        "broker": "",
        "x": 1850,
        "y": 960,
        "wires": []
    },
    {
        "id": "b5791d8d1e3cd0e2",
        "type": "mqtt out",
        "z": "06e5f3211441d2c9",
        "name": "",
        "topic": "cmnd/Bulb1/HSBColor",
        "qos": "",
        "retain": "",
        "respTopic": "",
        "contentType": "",
        "userProps": "",
        "correl": "",
        "expiry": "",
        "broker": "",
        "x": 1860,
        "y": 1000,
        "wires": []
    },
    {
        "id": "bd96d0317ce19ed8",
        "type": "mqtt out",
        "z": "06e5f3211441d2c9",
        "name": "",
        "topic": "cmnd/Bulb1/CT",
        "qos": "",
        "retain": "",
        "respTopic": "",
        "contentType": "",
        "userProps": "",
        "correl": "",
        "expiry": "",
        "broker": "",
        "x": 1840,
        "y": 1040,
        "wires": []
    },
    {
        "id": "716c401fa7d447a6",
        "type": "function",
        "z": "06e5f3211441d2c9",
        "name": "HomeKit to MQTT",
        "func": "\nvar POWER = msg.payload.POWER\nvar CT = msg.payload.CT\nvar Brightness = msg.payload.Brightness\n\n\n\nvar msg1 = {\n    'payload':msg.payload.POWER\n}\nvar msg2 = {\n    'payload': String(msg.payload.Hue) + ',' + String(msg.payload.Saturation) + ',' + String(msg.payload.Brightness)\n}\nvar msg3 = {\n    'payload': msg.payload.CT\n}\n\nreturn [msg1, msg2, msg3]",
        "outputs": 3,
        "timeout": "",
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 1370,
        "y": 1020,
        "wires": [
            [
                "6b1a17d11691405d"
            ],
            [
                "1840b68ad9fd374d"
            ],
            [
                "918b077bc11cf2c8"
            ]
        ]
    },
    {
        "id": "918b077bc11cf2c8",
        "type": "rbe",
        "z": "06e5f3211441d2c9",
        "name": "",
        "func": "rbe",
        "gap": "",
        "start": "",
        "inout": "out",
        "septopics": true,
        "property": "payload",
        "topi": "topic",
        "x": 1610,
        "y": 1040,
        "wires": [
            [
                "bd96d0317ce19ed8"
            ]
        ]
    },
    {
        "id": "1840b68ad9fd374d",
        "type": "rbe",
        "z": "06e5f3211441d2c9",
        "name": "",
        "func": "rbe",
        "gap": "",
        "start": "",
        "inout": "out",
        "septopics": true,
        "property": "payload",
        "topi": "topic",
        "x": 1610,
        "y": 1000,
        "wires": [
            [
                "b5791d8d1e3cd0e2"
            ]
        ]
    },
    {
        "id": "6b1a17d11691405d",
        "type": "rbe",
        "z": "06e5f3211441d2c9",
        "name": "",
        "func": "rbe",
        "gap": "",
        "start": "",
        "inout": "out",
        "septopics": true,
        "property": "payload",
        "topi": "topic",
        "x": 1610,
        "y": 960,
        "wires": [
            [
                "d95c2601a8314296"
            ]
        ]
    },
    {
        "id": "db564225372205c8",
        "type": "homekit-bridge",
        "bridgeName": "NRB BedRoom",
        "pinCode": "964-36-596",
        "port": "",
        "advertiser": "bonjour-hap",
        "allowInsecureRequest": false,
        "manufacturer": "NRCHKB",
        "model": "1.5.0",
        "serialNo": "Default Serial Number",
        "firmwareRev": "1.5.0",
        "hardwareRev": "1.5.0",
        "softwareRev": "1.5.0",
        "customMdnsConfig": false,
        "mdnsMulticast": true,
        "mdnsInterface": "",
        "mdnsPort": "",
        "mdnsIp": "",
        "mdnsTtl": "",
        "mdnsLoopback": true,
        "mdnsReuseAddr": true,
        "allowMessagePassthrough": true
    }
]