> 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-ht-+-pir-lite/decoding-and-bacnet-object-mapping/mclimate-ht-+-pir-lite-uplink-decoder.md).

# MClimate HT + PIR 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 handleKeepalive(bytes, data) {
            // Byte 1 bit 2: Occupied flag
            var occupiedValue = (bytes[1] & 0x04) >> 2;
            data.occupied = occupiedValue === 1;
            
            // Byte 1 (bits 1:0) and Byte 2: Internal temperature sensor data
            // Formula: t[°C] = (T[9:0] - 400) / 10
            // Extract bits 1:0 from byte 1 for the higher bits (bits 9:8)
            var tempHighBits = (bytes[1] & 0x03) << 8;
            // Use all bits from byte 2 for the lower bits (bits 7:0)
            var tempLowBits = bytes[2];
            // Combine to get the full 10-bit temperature value
            var tempValue = tempHighBits | tempLowBits;
            data.sensorTemperature = Number(((tempValue - 400) / 10).toFixed(2));
            
            // Byte 3: Relative Humidity data
            // Formula: RH[%] = (XX * 100) / 256
            data.relativeHumidity = Number(((bytes[3] * 100) / 256).toFixed(2));
            
            // Byte 4: Device battery voltage data
            // Battery voltage [mV] = ((XX * 2200) / 255) + 1600
            data.batteryVoltage = Number(((((bytes[4] * 2200) / 255) + 1600) / 1000).toFixed(2));
            
            // Byte 5: PIR trigger count
            data.pirTriggerCount = bytes[5];
            
            // For backward compatibility
            var pirValue = (bytes[1] & 0x04) >> 2;
            data.pirSensorStatus = pirValue === 1 ? "Motion detected" : "No motion detected";
            data.pirSensorValue = pirValue;
            
            return data;
        }

        function handleResponse(bytes, data){
            var commands = bytes.map(function(byte){
                return ("0" + byte.toString(16)).substr(-2); 
            });
            commands = commands.slice(0,-7); 
            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 '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 '1d':
                        {
                            command_len = 2;
                            var wdpC = commands[i + 1] == '00' ? false : parseInt(commands[i + 1], 16);
                            var wdpUc = commands[i + 2] == '00' ? false : parseInt(commands[i + 2], 16);
                            data.watchDogParams= { wdpC: wdpC, wdpUc: wdpUc } ;
                        }
                    break;
                    case '2f':
                        {
                            command_len = 1;
                            data.uplinkSendingOnButtonPress = parseInt(commands[i + 1], 16) ;
                        }
                    break;
                    case '3d':
                        {
                            command_len = 1;
                            data.pirSensorStatus = parseInt(commands[i + 1], 16);
                        }
                        break;
                    case '3f':
                        {
                            command_len = 1;
                            data.pirSensorSensitivity = parseInt(commands[i + 1], 16);
                        }
                        break;
                    case '49':
                        {
                            command_len = 1;
                            data.pirMeasurementPeriod = parseInt(commands[i + 1], 16);
                        }
                        break;
                    case '4b':
                        {
                            command_len = 1;
                            data.pirCheckPeriod = parseInt(commands[i + 1], 16);
                        }
                        break;
                    case '37':
                        {
                            command_len = 1;
                            data.pirSensorState = parseInt(commands[i + 1], 16);
                        }
                        break;
                    case '39':
                        {
                            command_len = 2;
                            data.occupancyTimeout = (parseInt(commands[i + 1], 16) << 8) | parseInt(commands[i + 2], 16);
                        }
                        break;
                    case '4d':
                        {
                            command_len = 1;
                            data.pirBlindPeriod = parseInt(commands[i + 1], 16);
                        }
                        break;
                    case 'a4': {
                        command_len = 1;
                        data.region = parseInt(commands[i + 1], 16);
                        break;
                    }
                    case 'a6': {
                        command_len = 1;
                        data.crystalOscillatorError = true;
                        break;
                    }
                    default:
                        break;
                }
                commands.splice(i,command_len);
            });
            return data;
        }

        // Route the message based on the command byte
        if (bytes[0] == 81) {
            // This is a keepalive message
            data = handleKeepalive(bytes, data);
        } else {
            // This is a response message
            data = handleResponse(bytes, data);
            // Handle the remaining keepalive data if present
            if (bytes.length >= 6) { // Check if there's enough bytes for a keepalive message
                bytes = bytes.slice(-6); // Extract the last 6 bytes which contain keepalive data
                data = handleKeepalive(bytes, data);
            }
        }

        return { data: data };
    } catch (e) {
        // console.log(e);
        throw new Error('Unhandled data');
    }
}
```


---

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