Having trouble decoding Sontay SORA Sensors

troy_judd · May 5, 2023, 5:07pm

I’m using a decoder sent to me by the manufacturer, but I keep getting the follwoing error when I try to decode a packet

js vm error: (anonymous): Line 12:7 Unexpected identifier (and 16 more errors)

Can;t for the life of me work it out and not getting much response from the manufacturer. If anyone can help I’d be most grateful.

/********************************************
 *	Sontay LoRaWAN Packet Decoder script	*
 *	v1.1									*
 *											*
 *	Compatible with Sontay LoRaWAN sensors	*
 ********************************************/

function decodeUplink(input) {
  
  let SENSOR_TEMP = (1 << 1);
  let SENSOR_RH = (1 << 2);
  let SENSOR_CO2 = (1 << 3);
  let TOTAL_DATA_SLOTS = 4;
  
  var data = {};
  var slot = 0;
  
  let sensors = (input.bytes[0] << 8) | (input.bytes[1] & 0xFE);
  
  var vBat = ((input.bytes[1] & 0x01) << 8) | input.bytes[2];
  data.Battery = vBat / 100;
  if(vBat >= 330)
	  data.BatteryStatus = "Good";
  else if(vBat < 300)
	  data.BatteryStatus = "Poor";
  else
	  data.BatteryStatus = "OK";
  
  for(let i = 1; i < 16; i++) {
    var d = (input.bytes[3+(2*slot)] << 8) | (input.bytes[4+(2*slot)]);
	
	if(d > 0x7FFF)
		d -= 0xFFFF;	// Correct for a negative value
	
    switch(sensors & (1 << i)) {
      case SENSOR_TEMP:
        data.Temperature = d / 100;
        break;
      case SENSOR_RH:
        data.Humidity = d / 10;
        break;
      case SENSOR_CO2:
        data.CO2 = d;
        break;
      default:
        continue;
    }
    
    if(++slot > TOTAL_DATA_SLOTS)
      break;
  }
  
  return {
    data,
    warnings: [],
    errors: []
  };
}

Jason_Reiss · May 6, 2023, 4:36pm

Looks like they gave you a TTN decoder.

Chirpstack has a different API.

function Decode(fPort, bytes, variables)

github.com

Bobobo-bo-Bo-bobo/chirpstack-elsys-payload-decoder/blob/master/chirpstack_v4-elsys-payload-codec.js

// Decode decodes an array of bytes into an object.
//  - fPort contains the LoRaWAN fPort number
//  - bytes is an array of bytes, e.g. [225, 230, 255, 0]
//  - variables contains the device variables e.g. {"calibration": "3.5"} (both the key / value are of type string)
// The function must return an object, e.g. {"temperature": 22.5}
function Decode(fPort, bytes, variables) {
    payload = Decoder(bytes, fPort);
    Object.keys(variables).forEach(function(key) { payload[key] = variables[key] } );
    return payload;
}

/*
  ______ _       _______     _______ 
 |  ____| |     / ____\ \   / / ____|
 | |__  | |    | (___  \ \_/ / (___  
 |  __| | |     \___ \  \   / \___ \ 
 | |____| |____ ____) |  | |  ____) |
 |______|______|_____/   |_| |_____/ 
 
  ELSYS simple payload decoder.

This file has been truncated. show original

Jason_Reiss · May 6, 2023, 4:41pm

troy_judd · May 7, 2023, 6:51am

Thanks. Have modified it accordingly and got it working.

Phelpo · May 28, 2024, 1:51pm

Hi there,
Did you ever get this working?
I have swapped out the decodeUplink statement with function Decode(fPort, bytes, variables) but no joy, just Line 12:7 Unexpected identifier.
I am using a Milesight Gateway so may be different.
Thanks

troy_judd · May 28, 2024, 3:15pm

Hi. Yes I did and its been running on a Milesight UG65 gateway for a while now.

/********************************************
 *	Sontay LoRaWAN Packet Decoder script	*
 *	v1.1									*
 *											*
 *	Compatible with Sontay LoRaWAN sensors	*
 *											*
 *	Adapted for use with Milesight Gateway	*
 *											*
 *	T Judd - Palcon Energy Services Ltd  	*
 ********************************************/
function Decode(fport, bytes) {
// function decodeUplink(input) {
  
  var SENSOR_TEMP = (1 << 1);
  var SENSOR_RH = (1 << 2);
  var SENSOR_CO2 = (1 << 3);
  var TOTAL_DATA_SLOTS = 4;
  
  var decoded = {};
  var slot = 0;
  
//  decoded.devEUI = LoRaObject.devEUI;
//	decoded.rssi = LoRaObject.rxInfo[0].rssi;
  
  var sensors = (bytes[0] << 8) | (bytes[1] & 0xFE);
  
  var vBat = ((bytes[1] & 0x01) << 8) | bytes[2];
  decoded.Battery = vBat / 100;
  if(vBat >= 330)
	  decoded.BatteryStatus = "Good";
  else if(vBat < 300)
	  decoded.BatteryStatus = "Poor";
  else
	  decoded.BatteryStatus = "OK";
  
  for(var i = 1; i < 16; i++) {
    var d = (bytes[3+(2*slot)] << 8) | (bytes[4+(2*slot)]);
	
	if(d > 0x7FFF)
		d -= 0xFFFF;	// Correct for a negative value
	
    switch(sensors & (1 << i)) {
      case SENSOR_TEMP:
        decoded.Temperature = d / 100;
        break;
      case SENSOR_RH:
        decoded.Humidity = d / 10;
        break;
      case SENSOR_CO2:
        decoded.CO2 = d;
        break;
      default:
        continue;
    }
    
    if(++slot > TOTAL_DATA_SLOTS)
      break;
  }
  
  return decoded

}

Phelpo · May 28, 2024, 4:10pm

Hi, that’s working now, I had the wrong return statement, was trying to use the data, warnings, errors bit from Sontay.

Excellent news thanks for your help.