meteohelix-message-decoder_chirpstack

var pos = 0;
var bindata = "";

var ConvertBase = function (num) {
    return {
        from : function (baseFrom) {
            return {
                to : function (baseTo) {
                    return parseInt(num, baseFrom).toString(baseTo);
                }
            };
        }
    };
};

function pad(num) {
    var s = "0000000" + num;
    return s.slice(-8);
}

ConvertBase.dec2bin = function (num) {
    return pad(ConvertBase(num).from(10).to(2));
};

ConvertBase.bin2dec = function (num) {
    return ConvertBase(num).from(2).to(10);
};

function data2bits(data) {
    var binary = "";
    for(var i=0; i<data.length; i++) {
        binary += ConvertBase.dec2bin(data[i]);
    }
    return binary;
}

function bitShift(bits) {
    var num = ConvertBase.bin2dec(bindata.substr(pos, bits));
    pos += bits;
    return Number(num);
}

function precisionRound(number, precision) {
  var factor = Math.pow(10, precision);
  return Math.round(number * factor) / factor;
}

function Decoder(bytes, port) {
  bindata = data2bits(bytes);
 
  //if(bytes.length != 12) return {"status": "ERROR", "describtion": "11 bytes are required"}
    Type =  bitShift(2);
    Battery = precisionRound(bitShift(5)*0.05+3, 2);
    Temperature = precisionRound(bitShift(11)*0.1-100, 1);
    T_min = precisionRound(Temperature - bitShift(6)*0.1, 1);
    T_max = precisionRound(Temperature + bitShift(6)*0.1, 1);
    Humidity = precisionRound(bitShift(9)*0.2, 1);
    Pressure = bitShift(14)*5+50000;
    Irradiation = bitShift(10)*2;
    Irr_max = Irradiation + bitShift(9)*2;
    Rain = precisionRound(bitShift(8), 1);
    Rain_min_time = precisionRound(bitShift(8), 1);
 
 
  decoded = {
    "Type": Type,
    "Battery": Battery,
    "Temperature": Temperature,
    "T_min": T_min ,
    "T_max": T_max,
    "Humidity": Humidity,
    "Pressure": Pressure,
    "Irradiation": Irradiation,
    "Irr_max": Irr_max,
    "Rain": Rain,
    "Rain min time": Rain_min_time
  };

  return decoded;
}

// This is the part needed for it to work with ChirpStack
function Decode(fPort, bytes) {
  return Decoder(bytes);
}