zTube - new TTN payload decoder

End Devices (Nodes)
1

https://www.zane.hu/en/webshop/ztrack-tube/
visit

regards

gerhard

2 
function Decoder(b,port)
{
  var decode     = {};
  var decode204  = {};
  var decode205  = {};
  var decode207  = {};

 if(port===204)
 {
  decode204.payload    = b;
  decode204.porta      = port;
    decode.lat         = b[0]<<24>>8 | b[1]<<8 | b[2];
    decode.lng         = b[3]<<24>>8 | b[4]<<8 | b[5];
  decode204.altitude   = b[6]<<8  | b[7];
  decode204.hdop       = b[8];

  decode204.battery =(b[11]>>4)*10;
  decode204.battery+=(b[11]&0x0F);
 
  decode204.latitude      = (decode.lat / 8388606) * 90;
  decode204.longitude     = (decode.lng / 8388606) * 180;
  
   return decode204; 

 }
  
 else if(port===205)
  {
    decode205.payload     = b;
    decode205.porta       = port;

  decode205.battery=(b[2]>>4)*10;
  decode205.battery+=(b[2]&0x0F);
  
  return decode205;

  }
  
  else if(port===207)
  {
    decode207.payload     = b;
    decode207.porta       = port;

  decode207.battery=(b[2]>>4)*10;
  decode207.battery+=(b[2]&0x0F);
  
  return decode207;

  }
   
   else 
   {
   decode.porta   = port;
   decode.payload = b;
   
   return decode;
   }
  
}

function Decoder(b,port)
{
    var decode     = {};
    var decode204  = {};
    var decode205  = {};
    var decode207  = {};

    decode204.payload    = b;
    decode204.porta      = port;
    decode.lat           = b[0]<<24>>8 | b[1]<<8 | b[2];
    decode.lng           = b[3]<<24>>8 | b[4]<<8 | b[5];
    decode204.altitude   = b[6]<<8  | b[7];
    decode204.hdop       = b[8];

    decode204.battery =(b[11]>>4)*10;
    decode204.battery+=(b[11]&0x0F);

    decode204.latitude      = (decode.lat / 8388606) * 90;
    decode204.longitude     = (decode.lng / 8388606) * 180;

    return {
        longitude:   decode204.longitude,
        latitude:    decode204.latitude,
        altitude:    decode204.altitude,
        hdop:        decode204.hdop,
        }
}

Works well too

3

with hdop . ok

4

In your Google document, it states:

  • artificial hdop added, because ttnmapper.org is in demand for this value and not provided here
    • according to CEO this will be added in new firmware version

So, are you saying that hdop is not currently expected in the payload?

And, for port = 204, the Google document uses the same bytes[8] for part of the temperature instead:

temp = (bytes[8] & 0x0F) * 100;
temp += ((bytes[9] & 0xF0) >> 4 ) * 10;
temp += bytes[9] & 0x0F;

if( bytes[8] & 80)
  temp /= -10;
else
  temp /= 10;

Also, the Google document extracts a battery value from bytes[10] for port = 204, while the version by @mid-walesha uses bytes[11]?

bat = ((bytes[10] & 0xF0) >> 4) * 10;
bat += bytes[10] & 0x0F

So, some mismatchs there?

(I don’t own this device. The Google document also extracts a temperature from bytes[0] and bytes[1] for the other port numbers, but that’s extra data, not a conflict.)

5

“So, are you saying that hdop is not currently expected in the payload?”
yes.
got this from the manufacturer. needs to be revised, obviously.