NodeRed flow - Shelly roller target position

flow.json

[
    {
        "id": "962a6866.a08c1",
        "type": "tab",
        "label": "Homekit roller",
        "disabled": false,
        "info": ""
    },
    {
        "id": "6342b342.4cc514",
        "type": "mqtt in",
        "z": "962a6866.a08c1",
        "name": "Position State",
        "topic": "shellies/shellyswitch25-XXXXXX/roller/0",
        "qos": "0",
        "datatype": "utf8",
        "broker": "2dff00a1.22e8e",
        "x": 130,
        "y": 120,
        "wires": [
            [
                "7cfe0504.2067bc"
            ]
        ]
    },
    {
        "id": "7cfe0504.2067bc",
        "type": "function",
        "z": "962a6866.a08c1",
        "name": "Manage position state",
        "func": "var currentPosition = flow.get('currentPosition') || null;\nvar requestedPosition = flow.get('requestedPosition') || null;\n\nif (msg.payload === 'open' && requestedPosition === null) {\n    return { payload: 100 };\n} else if (msg.payload === 'close'  && requestedPosition === null) {\n    return { payload: 0 };\n} else if (msg.payload === 'stop' && currentPosition !== null) {\n    flow.set('requestedPosition', null);\n    return { payload: currentPosition };\n} else {\n    return null;\n}",
        "outputs": 1,
        "noerr": 0,
        "x": 380,
        "y": 120,
        "wires": [
            [
                "358ce827.1dcf98"
            ]
        ]
    },
    {
        "id": "358ce827.1dcf98",
        "type": "mqtt out",
        "z": "962a6866.a08c1",
        "name": "target position",
        "topic": "shellies/shellyswitch25-XXXXXX/roller/0/targetPos",
        "qos": "",
        "retain": "",
        "broker": "2dff00a1.22e8e",
        "x": 660,
        "y": 120,
        "wires": []
    },
    {
        "id": "e78754d9.5938c8",
        "type": "mqtt in",
        "z": "962a6866.a08c1",
        "name": "Current Position",
        "topic": "shellies/shellyswitch25-XXXXXX/roller/0/pos",
        "qos": "0",
        "datatype": "utf8",
        "broker": "2dff00a1.22e8e",
        "x": 140,
        "y": 180,
        "wires": [
            [
                "89bd1a00.8b5458"
            ]
        ]
    },
    {
        "id": "89bd1a00.8b5458",
        "type": "function",
        "z": "962a6866.a08c1",
        "name": "Save current position",
        "func": "flow.set('currentPosition', parseInt(msg.payload));",
        "outputs": 0,
        "noerr": 0,
        "x": 380,
        "y": 180,
        "wires": []
    },
    {
        "id": "4069885b.3ffd28",
        "type": "mqtt in",
        "z": "962a6866.a08c1",
        "name": "Requested Position",
        "topic": "shellies/shellyswitch25-XXXXXX/roller/0/command/pos",
        "qos": "0",
        "datatype": "utf8",
        "broker": "2dff00a1.22e8e",
        "x": 150,
        "y": 60,
        "wires": [
            [
                "6f109085.cc2db8"
            ]
        ]
    },
    {
        "id": "6f109085.cc2db8",
        "type": "function",
        "z": "962a6866.a08c1",
        "name": "Manage Requested Position",
        "func": "flow.set('requestedPosition', parseInt(msg.payload))\nreturn { payload: msg.payload }",
        "outputs": 1,
        "noerr": 0,
        "x": 400,
        "y": 60,
        "wires": [
            [
                "358ce827.1dcf98"
            ]
        ]
    },
    {
        "id": "2dff00a1.22e8e",
        "type": "mqtt-broker",
        "z": "",
        "name": "Mosquitto",
        "broker": "localhost",
        "port": "1883",
        "clientid": "",
        "usetls": false,
        "compatmode": false,
        "keepalive": "60",
        "cleansession": true,
        "birthTopic": "",
        "birthQos": "0",
        "birthRetain": "false",
        "birthPayload": "",
        "closeTopic": "",
        "closeQos": "0",
        "closeRetain": "false",
        "closePayload": "",
        "willTopic": "",
        "willQos": "0",
        "willRetain": "false",
        "willPayload": ""
    }
]