DecoderFunctionTTN.txt

function Decoder(bytes, port) {
  // Decode an uplink message from a buffer
  // (array) of bytes to an object of fields.
  //var decoded = {};
  var battery = (bytes[2]);
 
  var gpsfixstatus = (bytes[1] >> 6);
  switch (gpsfixstatus) {
    case (2):
      gpsfixstatus = '3d';
      break;
    case (1):
      gpsfixstatus = '1d';
      break;
    default:
      gpsfixstatus = '0';
  }
 
  var reporttype = (bytes[1] & 63);
  switch (reporttype) {
    case (2):
      reporttype = '2:Periodic Mode';
      break;
    case (4):
      reporttype = '4:Motion mode static report';
      break;
    case (5):
      reporttype = '5:Motion mode moving report';
      break;
    case (6):
      reporttype = '6:Motion mode static to moving report';
      break;
    case (7):
      reporttype = '7:Motion mode moving to static report';
      break;
    case (14):
      reporttype = '14:Help report';
      break;
    case (15):
      reporttype = '15:Low battery alarm report';
      break;     
    case (17):
      reporttype = '17:Power on (temperature)';
      break;     
    case (19):
      reporttype = '19:Power off (low battery)';
      break;     
    case (20):
      reporttype = '20:Power off (temperature)';
      break;
    case (24):
      reporttype = '24:Fall advisory report';
      break;
    case (26):
      reporttype = '26: Exit from the secure zone';
      break;
    case (27):
      reporttype = '27:Fpending report';
      break;
    default:
      reporttype='';
  }
 
  var lat = (parseInt(((bytes[3]<<24)|(bytes[4]<<16)|(bytes[5]<<8)|bytes[6]),10))*0.000001;
  var long = (parseInt(((bytes[7]<<24)|(bytes[8]<<16)|(bytes[9]<<8)|bytes[10]),10))*0.000001;
  // if (port === 1) decoded.led = bytes[0];
 
  return {
    app_id:'uniud-track-id',
    dev_id:'gpstracker20',
    hardware_serial:'A840410001819108',
    battery: battery,
    reporttype: reporttype,
    gpsfixstatus: gpsfixstatus,
    latitude: lat,
    longitude: long
 }
}