decoder_datacake.js

/**
 * Entry, decoder.js
 */
function Decoder (bytes, port) {
    // init
    var bytesString = bytes2HexString(bytes)
        .toLocaleUpperCase();
    var decoded = {
        // valid
        valid: true,
        err: 0,
        // bytes
        payload: bytesString,
        // messages array
        messages: []
    };

    // CRC check
    if (!crc16Check(bytesString)) {
        decoded["valid"] = false;
        decoded["err"] = -1; // "crc check fail."
        return decoded;
    }

    // Length Check
    if ((((bytesString.length / 2) - 2) % 7) !== 0) {
        decoded["valid"] = false;
        decoded["err"] = -2; // "length check fail."
        return decoded;
    }

    // Cache sensor id
    var sensorEuiLowBytes;
    var sensorEuiHighBytes;

    // Handle each frame
    var frameArray = divideBy7Bytes(bytesString);
    for (var forFrame = 0; forFrame < frameArray.length; forFrame++) {
        var frame = frameArray[forFrame];
        // Extract key parameters
        var channel = strTo10SysNub(frame.substring(0, 2));
        var dataID = strTo10SysNub(frame.substring(2, 6));
        var dataValue = frame.substring(6, 14);
        var realDataValue = isSpecialDataId(dataID) ? ttnDataSpecialFormat(dataID, dataValue) : ttnDataFormat(dataValue);

        if (checkDataIdIsMeasureUpload(dataID)) {
            // if telemetry.
            decoded.messages.push({
                type: "report_telemetry",
                measurementId: dataID,
                measurementValue: realDataValue
            });
        } else if (isSpecialDataId(dataID) || (dataID === 5) || (dataID === 6)) {
            // if special order, except "report_sensor_id".
            switch (dataID) {
                case 0x00:
                    // node version
                    var versionData = sensorAttrForVersion(realDataValue);
                    decoded.messages.push({
                        type: "upload_version",
                        hardwareVersion: versionData.ver_hardware,
                        softwareVersion: versionData.ver_software
                    });
                    break;
                case 1:
                    // sensor version
                    break;
                case 2:
                    // sensor eui, low bytes
                    sensorEuiLowBytes = realDataValue;
                    break;
                case 3:
                    // sensor eui, high bytes
                    sensorEuiHighBytes = realDataValue;
                    break;
                case 7:
                    // battery power && interval
                    decoded.messages.push({
                        type: "upload_battery",
                        battery: realDataValue.power
                    }, {
                        type: "upload_interval",
                        interval: parseInt(realDataValue.interval) * 60
                    });
                    break;
                case 0x120:
                    // remove sensor
                    decoded.messages.push({
                        type: "report_remove_sensor",
                        channel: 1
                    });
                    break;
                default:
                    break;
            }
        } else {
            decoded.messages.push({
                type: "unknown_message",
                dataID: dataID,
                dataValue: dataValue
            });
        }

    }

    // if the complete id received, as "upload_sensor_id"
    if (sensorEuiHighBytes && sensorEuiLowBytes) {
        decoded.messages.unshift({
            type: "upload_sensor_id",
            channel: 1,
            sensorId: (sensorEuiHighBytes + sensorEuiLowBytes).toUpperCase()
        });
    }

    // return
    //return decoded;
    var datacakeFields = [];
    var messages = decoded.messages;
    for (var i = 0; i < messages.length; i++) {
        var message = messages[i];
        var id = message.measurementId;
        var value = message.measurementValue;
        switch (id) {
            case 4097:
                datacakeFields.push({
                    "field":"TEMPERATURE",
                    "value": value
                });
                break;
            case 4098:
                datacakeFields.push({
                    "field":"HUMIDITY",
                    "value": value
                });
                break;
            case 4099:
                datacakeFields.push({
                    "field":"LIGHT_INTENSITY",
                    "value": value
                });
                break;
            case 4100:
                datacakeFields.push({
                    "field":"CO2",
                    "value": value
                });
                break;
            case 4101:
                datacakeFields.push({
                    "field":"BAROMETRIC_PRESSURE",
                    "value": value
                });
                break;
            case 4102:
                datacakeFields.push({
                    "field":"SOIL_TEMPERATURE",
                    "value": value
                });
                break;
            case 4103:
                datacakeFields.push({
                    "field":"SOIL_MOISTURE",
                    "value": value
                });
                break;
            case 4104:
                datacakeFields.push({
                    "field":"WIND_DIRECTION",
                    "value": value
                });
                break;
            case 4105:
                datacakeFields.push({
                    "field":"WIND_SPEED",
                    "value": value
                });
                break;
            case 4106:
                datacakeFields.push({
                    "field":"PH",
                    "value": value
                });
                break;
            case 4107:
                datacakeFields.push({
                    "field":"LIGHT_QUANTUM",
                    "value": value
                });
                break;
            case 4108:
                datacakeFields.push({
                    "field":"ELECTRICAL_CONDUCTIVITY",
                    "value": value
                });
                break;
            case 4109:
                datacakeFields.push({
                    "field":"DISSOLVED_OXYGEN",
                    "value": value
                });
                break;
            case 4110:
                datacakeFields.push({
                    "field":"SOIL_VOLUMETRIC_WATER_CONTENT",
                    "value": value
                });
                break;
            case 4111:
                datacakeFields.push({
                    "field":"SOIL_ELECTRICAL_CONDUCTIVITY",
                    "value": value
                });
                break;
            case 4112:
                datacakeFields.push({
                    "field":"SOIL_TEMPERATURE(SOIL_TEMPERATURE, VWC & EC Sensor)",
                    "value": value
                });
                break;
            case 4113:
                datacakeFields.push({
                    "field":"RAINFALL_HOURLY",
                    "value": value
                });
                break;
            case 4115:
                datacakeFields.push({
                    "field":"DISTANCE",
                    "value": value
                });
                break;
            case 4116:
                datacakeFields.push({
                    "field":"WATER_LEAK",
                    "value": value
                });
                break;
            case 4117:
                datacakeFields.push({
                    "field":"LIGUID_LEVEL",
                    "value": value
                });
                break;
            case 4118:
                datacakeFields.push({
                    "field":"NH3",
                    "value": value
                });
                break;
            case 4119:
                datacakeFields.push({
                    "field":"H2S",
                    "value": value
                });
                break;
            case 4120:
                datacakeFields.push({
                    "field":"FLOW_RATE",
                    "value": value
                });
                break;
            case 4121:
                datacakeFields.push({
                    "field":"TOTAL_FLOW",
                    "value": value
                });
                break;
            case 4122:
                datacakeFields.push({
                    "field":"OXYGEN_CONCENTRATION",
                    "value": value
                });
                break;
            case 4123:
                datacakeFields.push({
                    "field":"WATER_ELETRICAL_CONDUCTIVITY",
                    "value": value
                });
                break;
            case 4124:
                datacakeFields.push({
                    "field":"WATER_TEMPERATURE",
                    "value": value
                });
                break;
            case 4125:
                datacakeFields.push({
                    "field":"SOIL_HEAT_FLUX",
                    "value": value
                });
                break;
            case 4126:
                datacakeFields.push({
                    "field":"SUNSHINE_DURATION",
                    "value": value
                });
                break;
            case 4127:
                datacakeFields.push({
                    "field":"TOTAL_SOLAR_RADIATION",
                    "value": value
                });
                break;
            case 4128:
                datacakeFields.push({
                    "field":"WATER_SURFACE_EVAPORATION",
                    "value": value
                });
                break;
            case 4129:
                datacakeFields.push({
                    "field":"PHOTOSYNTHETICALLY_ACTIVE_RADIATION_PAR",
                    "value": value
                });
                break;
            case 4130:
                datacakeFields.push({
                    "field":"ACCELEROMETER",
                    "value": value
                });
                break;
            case 4131:
                datacakeFields.push({
                    "field":"VOLUME",
                    "value": value
                });
                break;
            case 4133:
                datacakeFields.push({
                    "field":"SOIL_TENSION",
                    "value": value
                });
                break;
            case 4134:
                datacakeFields.push({
                    "field":"SALINITY",
                    "value": value
                });
                break;
            case 4135:
                datacakeFields.push({
                    "field":"TDS",
                    "value": value
                });
                break;
            case 4136:
                datacakeFields.push({
                    "field":"LEAF_TEMPERATURE",
                    "value": value
                });
                break;
            case 4137:
                datacakeFields.push({
                    "field":"LEAF_WETNESS",
                    "value": value
                });
                break;
            case 4138:
                datacakeFields.push({
                    "field":"SOIL_MOISTURE_10CM",
                    "value": value
                });
                break;
            case 4139:
                datacakeFields.push({
                    "field":"SOIL_MOISTURE_20CM",
                    "value": value
                });
                break;
            case 4140:
                datacakeFields.push({
                    "field":"SOIL_MOISTURE_30CM",
                    "value": value
                });
                break;
            case 4141:
                datacakeFields.push({
                    "field":"SOIL_MOISTURE_40CM",
                    "value": value
                });
                break;
            case 4142:
                datacakeFields.push({
                    "field":"SOIL_TEMPERATURE_10CM",
                    "value": value
                });
                break;
            case 4143:
                datacakeFields.push({
                    "field":"SOIL_TEMPERATURE_20CM",
                    "value": value
                });
                break;
            case 4144:
                datacakeFields.push({
                    "field":"SOIL_TEMPERATURE_30CM",
                    "value": value
                });
                break;
            case 4145:
                datacakeFields.push({
                    "field":"SOIL_TEMPERATURE_40CM",
                    "value": value
                });
                break;
            case 4146:
                datacakeFields.push({
                    "field":"PM2_5",
                    "value": value
                });
                break;
            case 4147:
                datacakeFields.push({
                    "field":"PM10",
                    "value": value
                });
                break;
            case 4148:
                datacakeFields.push({
                    "field":"NOISE",
                    "value": value
                });
                break;
            case 4150:
                datacakeFields.push({
                    "field":"ACCELEROMETERX",
                    "value": value
                });
                break;
            case 4151:
                datacakeFields.push({
                    "field":"ACCELEROMETERY",
                    "value": value
                });
                break;
            case 4152:
                datacakeFields.push({
                    "field":"ACCELEROMETERZ",
                    "value": value
                });
                break;
            case 5100:
                datacakeFields.push({
                    "field":"SWITCH",
                    "value": value
                });
                break;
            case 9990100:
                datacakeFields.push({
                    "field":"BATTERY",
                    "value": message.battery
                });
                break;
            case 9990200:
                datacakeFields.push({
                    "field":"INTERVAL",
                    "value": message.interval
                });
                break;
            case 9990300:
                datacakeFields.push({
                    "field":"REMOVED",
                    "value": message.interval
                });
                break;
        }
    }
    return datacakeFields
}

function crc16Check (data) {
    var crc16tab = [
        0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
        0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
        0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
        0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
        0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
        0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
        0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
        0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
        0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
        0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
        0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
        0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
        0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
        0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
        0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
        0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
        0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
        0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
        0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
        0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
        0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
        0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
        0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
        0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
        0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
        0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
        0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
        0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
        0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
        0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
        0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
        0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
    ];
    var result = false;
    var crc = 0;
    var dataArray = [];
    for (var i = 0; i < data.length; i += 2) {
        dataArray.push(data.substring(i, i + 2));
    }

    for (var j = 0; j < dataArray.length; j++) {
        var item = dataArray[j];
        crc = (crc >> 8) ^ crc16tab[(crc ^ parseInt(item, 16)) & 0xFF];
    }
    if (crc === 0) {
        result = true;
    }
    return result;
}

// util
function bytes2HexString (arrBytes) {
    var str = "";
    for (var i = 0; i < arrBytes.length; i++) {
        var tmp;
        var num = arrBytes[i];
        if (num < 0) {
            tmp = (255 + num + 1).toString(16);
        } else {
            tmp = num.toString(16);
        }
        if (tmp.length === 1) {
            tmp = "0" + tmp;
        }
        str += tmp;
    }
    return str;
}

// util
function divideBy7Bytes (str) {
    var frameArray = [];
    for (var i = 0; i < str.length - 4; i += 14) {
        var data = str.substring(i, i + 14);
        frameArray.push(data);
    }
    return frameArray;
}

// util
function littleEndianTransform (data) {
    var dataArray = [];
    for (var i = 0; i < data.length; i += 2) {
        dataArray.push(data.substring(i, i + 2));
    }
    dataArray.reverse();
    return dataArray;
}

// util
function strTo10SysNub (str) {
    var arr = littleEndianTransform(str);
    return parseInt(arr.toString()
        .replace(/,/g, ""), 16);
}

// util
function checkDataIdIsMeasureUpload (dataId) {
    return parseInt(dataId) > 4096;
}

// configurable.
function isSpecialDataId (dataID) {
    switch (dataID) {
        case 0:
        case 1:
        case 2:
        case 3:
        case 4:
        case 7:
        case 0x120:
            return true;
        default:
            return false;
    }
}

// configurable
function ttnDataSpecialFormat (dataId, str) {
    var strReverse = littleEndianTransform(str);
    if (dataId === 2 || dataId === 3) {
        return strReverse.join("");
    }

    // handle unsigned number
    var str2 = toBinary(strReverse);

    var dataArray = [];
    switch (dataId) {
        case 0: // DATA_BOARD_VERSION
        case 1: // DATA_SENSOR_VERSION
            // Using point segmentation
            for (var k = 0; k < str2.length; k += 16) {
                var tmp146 = str2.substring(k, k + 16);
                tmp146 = (parseInt(tmp146.substring(0, 8), 2) || 0) + "." + (parseInt(tmp146.substring(8, 16), 2) || 0);
                dataArray.push(tmp146);
            }
            return dataArray.join(",");
        case 4:
            for (var i = 0; i < str2.length; i += 8) {
                var item = parseInt(str2.substring(i, i + 8), 2);
                if (item < 10) {
                    item = "0" + item.toString();
                } else {
                    item = item.toString();
                }
                dataArray.push(item);
            }
            return dataArray.join("");
        case 7:
            // battery && interval
            return {
                interval: parseInt(str2.substr(0, 16), 2),
                power: parseInt(str2.substr(-16, 16), 2)
            };
    }
}

// util
function ttnDataFormat (str) {
    var strReverse = littleEndianTransform(str);
    var str2 = toBinary(strReverse);
    if (str2.substring(0, 1) === "1") {
        var arr = str2.split("");
        var reverseArr = [];
        for (var forArr = 0; forArr < arr.length; forArr++) {
            var item = arr[forArr];
            if (parseInt(item) === 1) {
                reverseArr.push(0);
            } else {
                reverseArr.push(1);
            }
        }
        str2 = parseInt(reverseArr.join(""), 2) + 1;
        return parseFloat("-" + str2 / 1000);
    }
    return parseInt(str2, 2) / 1000;
}

// util
function sensorAttrForVersion (dataValue) {
    var dataValueSplitArray = dataValue.split(",");
    return {
        ver_hardware: dataValueSplitArray[0],
        ver_software: dataValueSplitArray[1]
    };
}

// util
function toBinary (arr) {
    var binaryData = [];
    for (var forArr = 0; forArr < arr.length; forArr++) {
        var item = arr[forArr];
        var data = parseInt(item, 16)
            .toString(2);
        var dataLength = data.length;
        if (data.length !== 8) {
            for (var i = 0; i < 8 - dataLength; i++) {
                data = "0" + data;
            }
        }
        binaryData.push(data);
    }
    return binaryData.toString()
        .replace(/,/g, "");
}