QingPing Decoder

crmrosa · June 13, 2024, 7:30pm

Please include the following information, in order for us to help you as effectively as possible.

What product do you wish to discuss? QingPing CO2-TEMP-RH
What firmware version? 1.3.1
Computer OS? (MacOS, Linux, Windows) Windows
What Computer OS version? Windows 11
How often does the problem happen? Always
How can we replicate the problem? Yes

I am using the QingPing Decoder in the TTN, but it has a problem, because I am receiving a error message: “TypeError: Cannot read property ‘toString’ of undefined or null at Decoder”

{
  "name": "as.up.data.decode.fail",
  "time": "2024-06-13T19:16:46.465691117Z",
  "identifiers": [
    {
      "device_ids": {
        "device_id": "co2-temp-rh-001",
        "application_ids": {
          "application_id": "co2-temp-rh-nasondas"
        },
        "dev_eui": "D896E0EFFF000141",
        "join_eui": "D896E0EFFF000000"
      }
    }
  ],
  "data": {
    "@type": "type.googleapis.com/ttn.lorawan.v3.ErrorDetails",
    "namespace": "pkg/scripting/javascript",
    "name": "script",
    "message_format": "{message}",
    "attributes": {
      "message": "**TypeError: Cannot read property 'toString' of undefined or null at Decoder** (<eval>:7:25(15))"
    },
    "correlation_id": "61010a4845f04a90acb2e8cec54f7da5",
    "code": 10
  },
  "correlation_ids": [
    "gs:uplink:01J09GFWH95B0N0RPRSTYJXXE1"
  ],
  "origin": "ip-10-100-7-59.eu-west-1.compute.internal",
  "context": {
    "tenant-id": "CgN0dG4="
  },
  "visibility": {
    "rights": [
      "RIGHT_APPLICATION_TRAFFIC_READ"
    ]
  },
  "unique_id": "01J09GFWR1YRJKHXYQW78VQXV3"
}

This is the Decoder that I am using in the TTN:

function Decoder(bytes, port) 
{
  var decoded = {};

  var deviceAddress = bytes[0].toString(16).toUpperCase();
  var reportCode = bytes[1].toString(16).toUpperCase();
  decoded.deviceAddress = deviceAddress;
  decoded.reportCode = reportCode;

  var dataLength = parseInt(bytes[2].toString(16), 16);
  decoded.dataLength = dataLength;

  var dataType = bytes[3].toString(16).toUpperCase();
  decoded.dataType = dataType;

  if (dataType === "1") {
    var timestampBytes = bytes.slice(4, 8);
    var timestamp = bytesToHex(timestampBytes);
    decoded.timestamp = timestamp;

    var temperatureHumidityBytes = bytes.slice(8, 11);
    var temperatureHumidityHex = bytesToHex(temperatureHumidityBytes);
    var temperatureHumidityValue = parseInt(temperatureHumidityHex, 16);
    var temperature = ((temperatureHumidityValue >> 12) - 500) / 10;
    var humidity = (temperatureHumidityValue & 0xfff) / 10;
    decoded.temperature = temperature;
    decoded.humidity = humidity;

    var co2Bytes = bytes.slice(11, 13);
    var co2Value = parseInt(bytesToHex(co2Bytes), 16);
    decoded.co2 = co2Value;

    var battery = parseInt(bytes[13].toString(16), 16);
    decoded.battery = battery;

    var versionCodeBytes = bytes.slice(14, 20);
    var versionCode = bytesToHex(versionCodeBytes);
    decoded.versionCode = versionCode;

    var crcBytes = bytes.slice(20, 22);
    var crc = bytesToHex(crcBytes);
    decoded.crc = crc;
  }
  
  return decoded;
}

function bytesToHex(bytes) 
{
  var hexArray = [];
  for (var i = 0; i < bytes.length; i++) 
  {
    var hex = (bytes[i] & 0xff).toString(16).toUpperCase();
    if (hex.length === 1) 
    {
      hex = '0' + hex;
    }
    hexArray.push(hex);
  }
  return hexArray.join('');
}

Could you help me?

Claudio