# LSN50v2 dragino payload is suddenly not decoded properly anymore

**URL:** <https://www.thethingsnetwork.org/forum/t/lsn50v2-dragino-payload-is-suddenly-not-decoded-properly-anymore/61273>\
**Category:** Dragino\
**Created:** [February 2, 2023, 2:55pm UTC](https://www.thethingsnetwork.org/forum/t/lsn50v2-dragino-payload-is-suddenly-not-decoded-properly-anymore/61273 "2023-02-02T14:55:12Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![ecosoph](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/ecosoph/32/35697_2.png) [@ecosoph](https://www.thethingsnetwork.org/forum/u/ecosoph)\
**Post date:** [February 2, 2023, 2:55pm UTC](https://www.thethingsnetwork.org/forum/t/lsn50v2-dragino-payload-is-suddenly-not-decoded-properly-anymore/61273/1 "2023-02-02T14:55:13Z")

</div>

I have been using an LSN50v2 in MOD3 (the ADC mode) along with TheThingsStack community edition and Firmware version 1.7.2 for several weeks.

The setup was working fine without any changes. Today, I have noticed that the payload isn’t decoded properly anymore, giving following error:

`"message": "TypeError: Value is not object coercible at main (<eval>:208:30(29))"`

For this payload (no payload is decoded properly):  
`071E02D20E4308FFFFFFFF24`

I am using the device repository decoder:

```auto

function decodeUplink(input) {
  var mode=(input.bytes[6] & 0x7C)>>2;
    var data = {};
     switch (input.fPort) {
         case 2:
         if((mode!=2)&&(mode!=31))
{
  var decode = {};
 
  decode.Digital_IStatus= (input.bytes[6] & 0x02)? "H":"L";
 
  if(mode!=2)
  {
    decode.BatV= (input.bytes[0]<<8 | input.bytes[1])/1000;
    if((input.bytes[2]==0x7f)&&(input.bytes[3]==0xff))
      decode.TempC1= "NULL";
    else
      decode.TempC1= parseFloat(((input.bytes[2]<<24>>16 | input.bytes[3])/10).toFixed(1));
    if(mode!=8)
      decode.ADC_CH0V= (input.bytes[4]<<8 | input.bytes[5])/1000;
  }
 
  if((mode!=5)&&(mode!=6))
  {
      decode.EXTI_Trigger= (input.bytes[6] & 0x01)? "TRUE":"FALSE";
    decode.Door_status= (input.bytes[6] & 0x80)? "CLOSE":"OPEN";
  }
 
  if(mode=='0')
  {
    decode.Work_mode="IIC";
    if((input.bytes[9]<<8 | input.bytes[10])===0)
      decode.Illum= (input.bytes[7]<<8 | input.bytes[8]);
    else
    {
      if(((input.bytes[7]==0x7f)&&(input.bytes[8]==0xff))||((input.bytes[7]==0xff)&&(input.bytes[8]==0xff)))
        decode.TempC_SHT= "NULL";
      else
        decode.TempC_SHT= parseFloat(((input.bytes[7]<<24>>16 | input.bytes[8])/10).toFixed(1));
 
      if((input.bytes[9]==0xff)&&(input.bytes[10]==0xff))
        decode.Hum_SHT= "NULL";
      else
        decode.Hum_SHT= parseFloat(((input.bytes[9]<<8 | input.bytes[10])/10).toFixed(1));
    }
  }
  else if(mode=='1')
  {
    decode.Work_mode="Distance";

    if((input.bytes[7]===0x00)&&(input.bytes[8]===0x00))
      decode.Distance_cm= "NULL";
    else
      decode.Distance_cm= parseFloat(((input.bytes[7]<<8 | input.bytes[8])/10).toFixed(1));
       
    if(!((input.bytes[9]==0xff)&&(input.bytes[10]==0xff)))
      decode.Distance_signal_strength= (input.bytes[9]<<8 | input.bytes[10]);
  }
  else if(mode=='2')
  {
    decode.Work_mode="3ADC+IIC";
    decode.BatV= input.bytes[11]/10;
    decode.ADC_CH0V= (input.bytes[0]<<8 | input.bytes[1])/1000;
    decode.ADC_CH1V= (input.bytes[2]<<8 | input.bytes[3])/1000;
    decode.ADC_CH4V= (input.bytes[4]<<8 | input.bytes[5])/1000;
    if((input.bytes[9]<<8 | input.bytes[10])===0)
      decode.Illum= (input.bytes[7]<<8 | input.bytes[8]);
    else
    {
      if(((input.bytes[7]==0x7f)&&(input.bytes[8]==0xff))||((input.bytes[7]==0xff)&&(input.bytes[8]==0xff)))
        decode.TempC_SHT= "NULL";
      else
        decode.TempC_SHT= parseFloat(((input.bytes[7]<<24>>16 | input.bytes[8])/10).toFixed(1));
 
      if((input.bytes[9]==0xff)&&(input.bytes[10]==0xff))
        decode.Hum_SHT= "NULL";
      else
        decode.Hum_SHT= parseFloat(((input.bytes[9]<<8 | input.bytes[10])/10).toFixed(1));
    }
  }
  else if(mode=='3')
  {
    decode.Work_mode="3DS18B20";
    if((input.bytes[7]==0x7f)&&(input.bytes[8]==0xff))
      decode.TempC2= "NULL";
    else  
      decode.TempC2= parseFloat(((input.bytes[7]<<24>>16 | input.bytes[8])/10).toFixed(1));
     
    if((input.bytes[9]==0x7f)&&(input.bytes[10]==0xff))
      decode.TempC3= "NULL";  
    else
      decode.TempC3= parseFloat(((input.bytes[9]<<24>>16 | input.bytes[10])/10).toFixed(1));
  }
  else if(mode=='4')
  {
    decode.Work_mode="Weight";
    decode.Weight= (input.bytes[9]<<24 | input.bytes[10]<<16 | input.bytes[7]<<8 | input.bytes[8]);
  }
  else if(mode=='5')
  {
    decode.Work_mode="1Count";
    decode.Count= (input.bytes[7]<<24 | input.bytes[8]<<16 | input.bytes[9]<<8 | input.bytes[10])>>>0;
  }
  else if(mode=='6')
  {
    decode.Work_mode="3Interrupt";
    decode.EXTI1_Trigger= (input.bytes[6] & 0x01)? "TRUE":"FALSE";  
    decode.EXTI1_Status= (input.bytes[6] & 0x80)? "CLOSE":"OPEN";
    decode.EXTI2_Trigger= (input.bytes[7] & 0x10)? "TRUE":"FALSE";
    decode.EXTI2_Status= (input.bytes[7] & 0x01)? "CLOSE":"OPEN";
    decode.EXTI3_Trigger= (input.bytes[8] & 0x10)? "TRUE":"FALSE";
    decode.EXTI3_Status= (input.bytes[8] & 0x01)? "CLOSE":"OPEN";
  }
  else if(mode=='7')
  {
    decode.Work_mode="3ADC+1DS18B20";
    decode.ADC_CH1V= (input.bytes[7]<<8 | input.bytes[8])/1000;
    decode.ADC_CH4V= (input.bytes[9]<<8 | input.bytes[10])/1000;  
  }
  else if(mode=='8')
  {
    decode.Work_mode="3DS18B20+2Count";
    if((input.bytes[4]==0x7f)&&(input.bytes[5]==0xff))
      decode.TempC2= "NULL";
    else  
      decode.TempC2= parseFloat(((input.bytes[4]<<24>>16 | input.bytes[5])/10).toFixed(1));
     
    if((input.bytes[7]==0x7f)&&(input.bytes[8]==0xff))
      decode.TempC3= "NULL";  
    else
      decode.TempC3= parseFloat(((input.bytes[7]<<24>>16 | input.bytes[8])/10).toFixed(1));
     
    decode.Count1= (input.bytes[9]<<24 | input.bytes[10]<<16 | input.bytes[11]<<8 | input.bytes[12])>>>0;
    decode.Count2= (input.bytes[13]<<24 | input.bytes[14]<<16 | input.bytes[15]<<8 | input.bytes[16])>>>0;
  }
 
  if(input.bytes.length!=1)
    return {
       data:decode,
  }
  }
  break;
  case 5:
  {
    var decode = {};
      var freq_band;
      var sub_band;
     
    if(input.bytes[0]==0x01)
        decode.freq_band="EU868";
      else if(input.bytes[0]==0x02)
        decode.freq_band="US915";
      else if(input.bytes[0]==0x03)
        decode.freq_band="IN865";
      else if(input.bytes[0]==0x04)
        decode.freq_band="AU915";
      else if(input.bytes[0]==0x05)
        decode.freq_band="KZ865";
      else if(input.bytes[0]==0x06)
        decode.freq_band="RU864";
      else if(input.bytes[0]==0x07)
        decode.freq_band="AS923";
      else if(input.bytes[0]==0x08)
        decode.freq_band="AS923_1";
      else if(input.bytes[0]==0x09)
        decode.freq_band="AS923_2";
      else if(input.bytes[0]==0x0A)
        decode.freq_band="AS923_3";
      else if(input.bytes[0]==0x0F)
        decode.freq_band="AS923_4";
      else if(input.bytes[0]==0x0B)
        decode.freq_band="CN470";
      else if(input.bytes[0]==0x0C)
        decode.freq_band="EU433";
      else if(input.bytes[0]==0x0D)
        decode.freq_band="KR920";
      else if(input.bytes[0]==0x0E)
        decode.freq_band="MA869";
     
    if(input.bytes[1]==0xff)
      decode.sub_band="NULL";
      else
      decode.sub_band=input.bytes[1];

      decode.firm_ver= (input.bytes[2]&0x0f)+'.'+(input.bytes[3]>>4&0x0f)+'.'+(input.bytes[3]&0x0f);
     
      decode.tdc_time= input.bytes[4]<<16 | input.bytes[5]<<8 | input.bytes[6];
     
      return {
      data:decode,
      }
  }
      break;
default:
    return {
          errors: ["unknown FPort"]
}
}
}

```

---

<div class="post-metadata">

**Author:** ![ecosoph](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/ecosoph/32/35697_2.png) [@ecosoph](https://www.thethingsnetwork.org/forum/u/ecosoph)\
**Post date:** [February 2, 2023, 3:08pm UTC](https://www.thethingsnetwork.org/forum/t/lsn50v2-dragino-payload-is-suddenly-not-decoded-properly-anymore/61273/2 "2023-02-02T15:08:22Z")

</div>

I’ve connected to the node over serial, when switching to MOD=1, the payload is properly decoded (sample frm\_payload in MOD1: DkMAAAcdAP////8=). When switching back to MOD3, the above mentioned error occurs again (sample frm\_payload in MOD3: Bx4CoA5DCP////8k). All modes are working except MOD3.

---

<div class="post-metadata">

**Author:** ![descartes](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/descartes/32/47220_2.png) [@descartes](https://www.thethingsnetwork.org/forum/u/descartes)\
**Post date:** [February 2, 2023, 3:44pm UTC](https://www.thethingsnetwork.org/forum/t/lsn50v2-dragino-payload-is-suddenly-not-decoded-properly-anymore/61273/3 "2023-02-02T15:44:12Z")

</div>

> [@ecosoph](#):
>
> I am using the device repository decoder:

Which exact model of the LSN50v2 did you select when setting up - this decoder is not for the vanilla LSN50v2 …

---

<div class="post-metadata">

**Author:** ![ecosoph](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/ecosoph/32/35697_2.png) [@ecosoph](https://www.thethingsnetwork.org/forum/u/ecosoph)\
**Post date:** [February 2, 2023, 3:47pm UTC](https://www.thethingsnetwork.org/forum/t/lsn50v2-dragino-payload-is-suddenly-not-decoded-properly-anymore/61273/4 "2023-02-02T15:47:08Z")

</div>

I have used this configuration:  
 ![grafik](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/5/3/53f3d1a11b8ad2022f589c48a2425b7d8850cd0c.png)  
Which worked fine previously. I am currently trying to upgrade from 1.7.2 (confirmed by reading out over Tera Term) to 1.8.0.

I am having issues with flashing the new firmware using ST Flash demonstrator…it always crashes. I have had issues previously with the right timing to hit the reset button… maybe it is more convenient ot get an ST Link v2 for this…

---

<div class="post-metadata">

**Author:** ![ecosoph](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/ecosoph/32/35697_2.png) [@ecosoph](https://www.thethingsnetwork.org/forum/u/ecosoph)\
**Post date:** [February 2, 2023, 4:02pm UTC](https://www.thethingsnetwork.org/forum/t/lsn50v2-dragino-payload-is-suddenly-not-decoded-properly-anymore/61273/5 "2023-02-02T16:02:46Z")

</div>

I have updated the node to firmware version 1.8.0 and mod8 is working fine…so only mod3, which I needed wasn’t working. I am a bit worried now: I guess the payload decoders are regularly updated. So once I have a working configuration in the field, I should probably ‘hard code’ the working payload decoder. What do you think @descartes ?