//The function is :
function Decoder(bytes, port) {
// Decode an uplink message from a buffer
// (array) of bytes to an object of fields.
var value=bytes[0]<<24 | bytes[1]<<16 | bytes[2]<<8 | bytes[3];
if(bytes[0] & 0x80)
{
value |=0xFFFFFFFF00000000
}
var latitude=value/1000000;//gps latitude,units: °
value=bytes[4]<<24 | bytes[5]<<16 | bytes[6]<<8 | bytes[7];
if(bytes[4] & 0x80)
{
value |=0xFFFFFFFF00000000;
}
var longitude=value/1000000;//gps longitude,units: °
var alarm=(bytes[8] & 0x40)?"TRUE":"FALSE";//Alarm status
value=((bytes[8] & 0x3f) <<8) | bytes[9];
var batV=value/1000;//Battery,units:V
value=(bytes[10] & 0xC0);
if(value==0x40)
{
var motion_mode="Move";
}
else if(value==0x80)
{
motion_mode="Collide";
}
else if(value==0xC0)
{
motion_mode="User";
}
else
{
motion_mode="Disable";
} //mode of motion
var led_updown=(bytes[10] & 0x20)?"ON":"OFF";//LED status for position,uplink and downlink
value=bytes[11]<<8 | bytes[12];
if((bytes[10] & 0x1f)=='0x00')
{
  var version="LGT92_v1.5.0";
}
if(bytes[11] & 0x80)
{
value |=0xFFFF0000;
}
var roll=value/100;//roll,units: °
value=bytes[13]<<8 | bytes[14];
if(bytes[13] & 0x80)
{
value |=0xFFFF0000;
}
var pitch=value/100; //pitch,units: °
return {
Version:version,
Latitude: latitude,
Longitude: longitude,
Roll: roll,
Pitch:pitch,
BatV:batV,
ALARM_status:alarm,
MD:motion_mode,
LON:led_updown,
};
}