Node-REDでのEnOceanのデータ読み取りをもう少し踏み込んだメモ

// データそのもの
var baseData = msg.payload;
// データの長さ
var length = 7;  //  1番目と2番目の合算らしいがうまくやる方法がわからない
// PacketType
var PacketType = baseData [ 4 ];
// dataLengthに基づいたデータ部分の切り出し
var data = baseData .slice( 7 , 7 + length );
// payloadに格納
msg.payload = {
    PacketType:PacketType,
    data:data
}

// データそのもの
var buf = msg.payload;
// データのコピー（検証用）
var rawData = buf.slice( 0 , buf.length - 1 );
// 取り出しやすいようにhex変換したもの
var rawByte = buf.toString( "hex" );
// ESP3仕様のdataLengthを拾う
var dataLength = 255 * buf[ 1 ] + buf[ 2 ];
// ESP3仕様のoptionalLengthを拾う
var optionalLength = buf[ 3 ];
// packetType
var packetType = buf[ 4 ];
// headerCRC
var headerCRC = buf[ 5 ];
// dataLengthに基づいたデータ部分の切り出し
var rawDataByte = buf.slice( 7 , 7 + dataLength );
// payloadに格納
msg.payload = {
    rawData:rawData,
    rawByte:rawByte,
    dataLength:dataLength,
    optionalLength:optionalLength,
    packetType:packetType,
    headerCRC:headerCRC,
    rawDataByte:rawDataByte
}

// ユニークなID
var id = rawDataByte.slice( 0 , 3 ).toString( "hex" );

// ユニークなID
var id = rawDataByte.slice( 0 , 3 ).toString( "hex" );

if(id == "002daf"){
    // 機器の状態
    var state;
    if(rawDataByte[4] == 0 && rawDataByte[5] == 228){
        state = "all off";
    }else if(rawDataByte[4] == 130 && rawDataByte[5] == 99){
        state = "left on";
    }else if(rawDataByte[4] == 136 && rawDataByte[5] == 85){
        state = "right on";
    }
}

[
    {
        "id": "6d969c0a.dcc224",
        "type": "serial in",
        "z": "1b0ee49a.dc829b",
        "name": "",
        "serial": "c5d2351b.ae8378",
        "x": 450,
        "y": 380,
        "wires": [
            [
                "1cfd9d3b.7e8803"
            ]
        ]
    },
    {
        "id": "ddb5e219.38897",
        "type": "debug",
        "z": "1b0ee49a.dc829b",
        "name": "",
        "active": false,
        "console": "false",
        "complete": "payload",
        "x": 810,
        "y": 380,
        "wires": []
    },
    {
        "id": "1cfd9d3b.7e8803",
        "type": "function",
        "z": "1b0ee49a.dc829b",
        "name": "データ分類",
        "func": "// データそのもの\nvar buf = msg.payload;\n// データのコピー（検証用）\nvar rawData = buf.slice( 0 , buf.length - 1 );\n// 取り出しやすいようにhex変換したもの\nvar rawByte = buf.toString( \"hex\" );\n// ESP3仕様のdataLengthを拾う\nvar dataLength = 255 * buf[ 1 ] + buf[ 2 ];\n// ESP3仕様のoptionalLengthを拾う\nvar optionalLength = buf[ 3 ];\n// packetType\nvar packetType = buf[ 4 ];\n// headerCRC\nvar headerCRC = buf[ 5 ];\n// dataLengthに基づいたデータ部分の切り出し\nvar rawDataByte = buf.slice( 7 , 7 + dataLength );\n// payloadに格納\nmsg.payload = {\n    rawData:rawData,\n    rawByte:rawByte,\n    dataLength:dataLength,\n    optionalLength:optionalLength,\n    packetType:packetType,\n    headerCRC:headerCRC,\n    rawDataByte:rawDataByte\n}\n\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "x": 630,
        "y": 380,
        "wires": [
            [
                "ddb5e219.38897",
                "d1b63427.771808"
            ]
        ]
    },
    {
        "id": "d1b63427.771808",
        "type": "debug",
        "z": "1b0ee49a.dc829b",
        "name": "",
        "active": true,
        "console": "false",
        "complete": "payload.rawDataByte",
        "x": 850,
        "y": 460,
        "wires": []
    },
    {
        "id": "c5d2351b.ae8378",
        "type": "serial-port",
        "z": "",
        "serialport": "/dev/ttyUSB0",
        "serialbaud": "57600",
        "databits": "8",
        "parity": "none",
        "stopbits": "1",
        "newline": "100",
        "bin": "bin",
        "out": "time",
        "addchar": false
    }
]