function decodeUplink(input) {
        return { 
            data: Decode(input.fPort, input.bytes, input.variables)
        };   
}
function datalog(i,bytes){
  var aa=(bytes[0+i]<<8 |bytes[1+i])/1000
  var bb=bytes[2+i]<<8 |bytes[3+i]
  var cc=bytes[4+i]<<8 |bytes[5+i]
  var dd=(bytes[6+i]&0x01)?"YES":"NO"; 
  var ee=((bytes[6+i]>>1)&0x01)?"TRUE":"FALSE"; 
  var ff=(bytes[6+i]&0x40)?"1":"0"; 
  var gg= getMyDate((bytes[7+i]<<24 | bytes[8+i]<<16 | bytes[9+i]<<8 | bytes[10+i]).toString(10));
  var string='['+aa+','+bb+','+cc+','+dd+','+ee+','+ff+','+gg+']'+',';  
  
  return string;
}
function getzf(c_num){ 
  if(parseInt(c_num) < 10)
    c_num = '0' + c_num; 

  return c_num; 
}
function getMyDate(str){ 
  var c_Date;
  if(str > 9999999999)
    c_Date = new Date(parseInt(str));
  else 
    c_Date = new Date(parseInt(str) * 1000);
  
  var c_Year = c_Date.getFullYear(), 
  c_Month = c_Date.getMonth()+1, 
  c_Day = c_Date.getDate(),
  c_Hour = c_Date.getHours(), 
  c_Min = c_Date.getMinutes(), 
  c_Sen = c_Date.getSeconds();
  var c_Time = c_Year +'-'+ getzf(c_Month) +'-'+ getzf(c_Day) +' '+ getzf(c_Hour) +':'+ getzf(c_Min) +':'+getzf(c_Sen); 
  
  return c_Time;
}
function Decode(fPort, bytes, variables) {
  // Decode an uplink message from a buffer
  // (array) of bytes to an object of fields.
  if(fPort==0x02) 
  {
var value=(bytes[0]<<8 | bytes[1]) & 0x3FFF;
  var batV=value/1000;//Battery,units:V
   
  value=bytes[2]<<8 | bytes[3];
  var distance=(value);//distance,units:mm

  var i_flag = bytes[4]; 
  
  value=bytes[5]<<8 | bytes[6];
  if(bytes[5] & 0x80)
  {value |= 0xFFFF0000;}
  var temp_DS18B20=(value/10).toFixed(2);//DS18B20,temperature  
  
  var s_flag = bytes[7];	
  return {
       Node_type:"DDS20-LB",
       Bat:batV,
       Distance:distance,
	   Interrupt_flag:i_flag,
	   TempC_DS18B20:temp_DS18B20,
	   Sensor_flag:s_flag,
  };
}
 else if(fPort==0x03)  
  {
    var pnack= ((bytes[0]>>7)&0x01) ? "True":"False";
    for(var i=0;i<bytes.length;i=i+11)
    {
      var data= datalog(i,bytes);
      if(i=='0')
        data_sum=data;
      else
        data_sum+=data;
    }
    return{
	Node_type:"DDS20-LB",
    DATALOG:data_sum,
    PNACKMD:pnack,
    };    
  }  
else if(fPort==0x05)
  {
    var sub_band;
    var freq_band;
    var sensor;
    
    if(bytes[0]==0x29)
      sensor= "DDS20-LB";
      
    if(bytes[4]==0xff)
      sub_band="NULL";
    else
      sub_band=bytes[4];
    
    if(bytes[3]==0x01)
      freq_band="EU868";
    else if(bytes[3]==0x02)
      freq_band="US915";
    else if(bytes[3]==0x03)
      freq_band="IN865";
    else if(bytes[3]==0x04)
      freq_band="AU915";
    else if(bytes[3]==0x05)
      freq_band="KZ865";
    else if(bytes[3]==0x06)
      freq_band="RU864";
    else if(bytes[3]==0x07)
      freq_band="AS923";
    else if(bytes[3]==0x08)
      freq_band="AS923_1";
    else if(bytes[3]==0x09)
      freq_band="AS923_2";
    else if(bytes[3]==0x0A)
      freq_band="AS923_3";
    else if(bytes[3]==0x0B)
      freq_band="CN470";
    else if(bytes[3]==0x0C)
      freq_band="EU433";
    else if(bytes[3]==0x0D)
      freq_band="KR920";
    else if(bytes[3]==0x0E)
      freq_band="MA869";
      
    var firm_ver= (bytes[1]&0x0f)+'.'+(bytes[2]>>4&0x0f)+'.'+(bytes[2]&0x0f);
    var bat= ((bytes[5]<<8 | bytes[6]) & 0x3FFF)/1000
    
    return {
    SENSOR_MODEL:sensor,
    FIRMWARE_VERSION:firm_ver,
    FREQUENCY_BAND:freq_band,
    SUB_BAND:sub_band,
    BAT:bat,
    };
  }
  }