> For the complete documentation index, see [llms.txt](https://docs.mclimate.eu/mclimate-lorawan-devices/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mclimate.eu/mclimate-lorawan-devices/devices/mclimate-co2-display-lite/decoding-and-bacnet-object-mapping/mclimate-co2-display-lite-uplink-decoder.md).

# MClimate CO2 Display lite Uplink decoder

## Universal Decoder: <a href="#universal-decoder" id="universal-decoder"></a>

*Supports: The Thinks Network, Milesight, DataCake, Chirpstack*

```
// DataCake
function Decoder(bytes, port){
    var decoded = decodeUplink({ bytes: bytes, fPort: port }).data;
    return decoded;
}

// Milesight
function Decode(port, bytes){
    var decoded = decodeUplink({ bytes: bytes, fPort: port }).data;
    return decoded;
}

// The Things Industries / Main
function decodeUplink(input) {
    try{
        var bytes = input.bytes;
        var data = {};
        function toBool(value){
            return value == '1';
        }
        function calculateTemperature(rawData){
            return (rawData - 400) / 10;
        }
        function calculateHumidity(rawData){
            return (rawData * 100) / 256;
        }
        function handleKeepalive(bytes, data) {
            // Temperature calculation from two bytes
            var temperatureRaw = (bytes[1] << 8) | bytes[2]; // Shift byte[1] left by 8 bits and OR with byte[2]
            data.sensorTemperature = Number(calculateTemperature(temperatureRaw).toFixed(2));
        
            // Humidity calculation
            data.relativeHumidity = Number(calculateHumidity(bytes[3]).toFixed(2));
        
            // Battery voltage calculation from two bytes
            var batteryVoltageRaw = (bytes[4] << 8) | bytes[5];
            data.batteryVoltage = Number((batteryVoltageRaw / 1000).toFixed(2));
        
            // CO2 calculation from bytes 6 and 7
            var co2Low = bytes[6]; // Lower byte of CO2
            var co2High = (bytes[7] & 0xF8) >> 3; // Mask the upper 5 bits and shift them right
            data.CO2 = (co2High << 8) | co2Low; // Shift co2High left by 8 bits and combine with co2Low
        
            // Power source status
            data.powerSourceStatus = bytes[7] & 0x07; // Extract the last 3 bits directly
        
            // Light intensity from two bytes
            var lightIntensityRaw = (bytes[8] << 8) | bytes[9];
            data.lux = lightIntensityRaw;
        
            return data;
        }
    
        function handleResponse(bytes, data){
        var commands = bytes.map(function(byte){
            return ("0" + byte.toString(16)).substr(-2); 
        });
        commands = commands.slice(0,-8);
        var command_len = 0;
    
        commands.map(function (command, i) {
            switch (command) {
                case '04':
                    {
                        command_len = 2;
                        var hardwareVersion = commands[i + 1];
                        var softwareVersion = commands[i + 2];
                        data.deviceVersions = { hardware: Number(hardwareVersion), software: Number(softwareVersion) };
                    }
                break;
                case '12':
                    {
                        command_len = 1;
                        data.keepAliveTime = parseInt(commands[i + 1], 16);
                    }
                break;
                case '14':
                    {
                        command_len = 1;
                        data.childLock = toBool(parseInt(commands[i + 1], 16)) ;
                    }
                break;
                case '19':
                    {
                        command_len = 1;
                        var commandResponse = parseInt(commands[i + 1], 16);
                        var periodInMinutes = commandResponse * 5 / 60;
                        data.joinRetryPeriod =  periodInMinutes;
                    }
                break;
                case '1b':
                    {
                        command_len = 1;
                        data.uplinkType = parseInt(commands[i + 1], 16) ;
                    }
                break;
                case '1f':
                    {
                        command_len = 4;
                        var good_medium =  (parseInt(commands[i + 1], 16) << 8) | 
                        parseInt(commands[i + 2], 16);
                        var medium_bad =  (parseInt(commands[i + 3], 16) << 8) | 
                        parseInt(commands[i + 4], 16);
                        
                        data.boundaryLevels = { good_medium: Number(good_medium), medium_bad: Number(medium_bad) } ;
                    }
                break;
                case '1d':
                    {
                        command_len = 2;
                        var deviceKeepAlive = 5;
                        var wdpC = commands[i + 1] == '00' ? false : commands[i + 1] * deviceKeepAlive + 7;
                        var wdpUc = commands[i + 2] == '00' ? false : parseInt(commands[i + 2], 16);
                        data.watchDogParams= { wdpC: wdpC, wdpUc: wdpUc } ;
                    }
                break;
                case '21':
                    {
                        command_len = 2;
                        data.autoZeroValue = (parseInt(commands[i + 1], 16) << 8) | 
                        parseInt(commands[i + 2], 16);
                    }
                break;
                case '25':
                    {
                        command_len = 3;
                        var good_zone = parseInt(commands[i + 1], 16);
                        var medium_zone = parseInt(commands[i + 2], 16);
                        var bad_zone = parseInt(commands[i + 3], 16);
                        
                        data.measurementPeriod = { good_zone: Number(good_zone), medium_zone: Number(medium_zone), bad_zone: Number(bad_zone) } ;
                    }
                break;
                case '2b':
                    {
                        command_len = 1;
                        data.autoZeroPeriod = parseInt(commands[i + 1], 16);
                    }
                break;
                case '34':
                    {
                        command_len = 1;
                        data.displayRefreshPeriod = parseInt(commands[i + 1], 16) ;
                    }
                break;
                case '41':
                    {
                        command_len = 1;
                        data.currentTemperatureVisibility = parseInt(commands[i + 1], 16) ;
                    }
                break;
                case '43':
                    {
                        command_len = 1;
                        data.humidityVisibility = parseInt(commands[i + 1], 16) ;
                    }
                break;
                case '45':
                    {
                        command_len = 1;
                        data.lightIntensityVisibility = parseInt(commands[i + 1], 16) ;
                    }
                break;
                case '80':
                    {
                        command_len = 1;
                        data.measurementBlindTime = parseInt(commands[i + 1], 16) ;
                    }
                break;
                case 'a0': {
                    command_len = 4;
                    var fuota_address = (parseInt(commands[i + 1], 16) << 24) | 
                                      (parseInt(commands[i + 2], 16) << 16) | 
                                      (parseInt(commands[i + 3], 16) << 8) | 
                                      parseInt(commands[i + 4], 16);
                    var fuota_address_raw = commands[i + 1] + commands[i + 2] + 
                                          commands[i + 3] + commands[i + 4];
                    
                    data.fuota = { fuota_address: fuota_address, fuota_address_raw: fuota_address_raw };
                    break;
                }
                default:
                    break;
            }
            commands.splice(i,command_len);
        });
        return data;
        }
        if (bytes[0] == 1) {
            data = handleKeepalive(bytes, data);
        }else{
            data = handleResponse(bytes,data);
            bytes = bytes.slice(-10);
            data = handleKeepalive(bytes, data);
        }
        return {data: data};
    } catch (e) {
        console.log(e)
        throw new Error('Unhandled data');
    }
}
```


---

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