AM 107 decoder Error

[ByroneIntel]

Good day, GitHub community!

I hope everything is going well on your end.

I’ve been facing an issue with the AM107 Decoder function. Despite successfully running my decoder on a Lambda function and confirming data transfer (the uplink time is accurate), I can’t seem to retrieve accurate payload data.

I’m using an E-Link device to measure temperatures, and my goal is for the Lambda function to display the exact temperatures as shown on the E-Link device. I’ve followed the integration guide provided, (https://support.milesight-iot.com/support/solutions/articles/73000514172-aws-iot-core-for-lorawan-milesight-sensors-integration).

I would greatly appreciate any assistance or insights to achieve accurate data display from my Lambda function. I have attached screenshots for your reference and the Milesight IoT Am107 repo with the code (https://github.com/Milesight-IoT/SensorDecoders/blob/main/AM_Series/AM107/AM107_Decoder.js)

Thank you in advance!

import AWS from 'aws-sdk';
// import milesightDeviceDecode from "./decoder.js"

export const handler = (event, context, callback) => {
console.log("Event received:", event);

// Validate event.PayloadData
if (!event || !event.PayloadData) {
    console.error("Invalid event: PayloadData is missing or undefined.");
    callback(new TypeError("Invalid event: PayloadData is missing or undefined."));
    return;
}


try {
    var data = Buffer.from(event.PayloadData, 'base64');
    var chars = [...data];
    console.log("Decoded bytes:", chars);

    var params = decodeUplink(chars);
    console.log("Decoded parameters:", params);

    var iotdata = new AWS.IotData({ endpoint: '123456789-ats.iot.eu-west-1.amazonaws.com' });
    var response = {
        topic: event.WirelessMetadata.LoRaWAN.DevEui.concat("/project/sensor/decoded"),
        payload: JSON.stringify(params),
        qos: 0
    };

    console.log("Publishing to IoT topic:", response.topic);
    iotdata.publish(response, function(err, data) {
        if (err) {
            console.error("IoT publish error:", JSON.stringify(err));
            callback(err);
        } else {
            console.log("Published data:", response);
            callback(null, {
                statusCode: 200,
                body: JSON.stringify(params)
            });
        }
    });
} catch (error) {
    console.error("Error processing event:", error);
    callback(error);
}

};

function decodeUplink(input) {
// Validate input structure
if (!input || !Array.isArray(input)) {
throw new TypeError('Invalid input: input must be an array');
}

console.log("Input for decoding:", input);
var decoded = milesightDeviceDecode(input);
return { PayloadData: decoded };

}

function milesightDeviceDecode(bytes) {
var decoded = {};

for (var i = 0; i < bytes.length; ) {
    var channel_id = bytes[i++];
    var channel_type = bytes[i++];
    // BATTERY
    if (channel_id === 0x01 && channel_type === 0x75) {
        decoded.battery = bytes[i];
        i += 1;
    }
    // TEMPERATURE
    else if (channel_id === 0x03 && channel_type === 0x67) {
        // ℃
        decoded.temperature = readInt16LE(bytes.slice(i, i + 2)) / 10;
        i += 2;

        // ℉
        // decoded.temperature = readInt16LE(bytes.slice(i, i + 2)) / 10 * 1.8 + 32;
        // i +=2;
    }
    // HUMIDITY
    else if (channel_id === 0x04 && channel_type === 0x68) {
        decoded.humidity = bytes[i] / 2;
        i += 1;
    }
    // PIR
    else if (channel_id === 0x05 && channel_type === 0x6a) {
        decoded.activity = readUInt16LE(bytes.slice(i, i + 2));
        i += 2;
    }
    // LIGHT
    else if (channel_id === 0x06 && channel_type === 0x65) {
        decoded.illumination = readUInt16LE(bytes.slice(i, i + 2));
        decoded.infrared_and_visible = readUInt16LE(bytes.slice(i + 2, i + 4));
        decoded.infrared = readUInt16LE(bytes.slice(i + 4, i + 6));
        i += 6;
    }
    // CO2
    else if (channel_id === 0x07 && channel_type === 0x7d) {
        decoded.co2 = readUInt16LE(bytes.slice(i, i + 2));
        i += 2;
    }
    // TVOC
    else if (channel_id === 0x08 && channel_type === 0x7d) {
        decoded.tvoc = readUInt16LE(bytes.slice(i, i + 2));
        i += 2;
    }
    // PRESSURE
    else if (channel_id === 0x09 && channel_type === 0x73) {
        decoded.pressure = readUInt16LE(bytes.slice(i, i + 2)) / 10;
        i += 2;
    } else {
        break;
    }
}
console.log('Decoded data:', decoded);

return decoded;

}

function readUInt16LE(bytes) {
var value = (bytes[1] << 8) + bytes[0];
return value & 0xffff;
}

function readInt16LE(bytes) {
var ref = readUInt16LE(bytes);
return ref > 0x7fff ? ref - 0x10000 : ref;
}

[milesight-sway]

Based on the information you provided, it seems that event.PayloadData is not defined. Please examine the data contained in the console.log("Event received:", event); output.