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~val & mask) + 1; // invert all bits & add 1 => now positive value
        val = val * -1;
    }
    return val;
}

function uint40_BE(bytes, idx) {
    bytes = bytes.slice(idx || 0);
    return bytes[0] << 32 |
        bytes[1] << 24 | bytes[2] << 16 | bytes[3] << 8 | bytes[4] << 0;
}

function uint16_BE(bytes, idx) {
    bytes = bytes.slice(idx || 0);
    return bytes[0] << 8 | bytes[1] << 0;
}

function int40_BE(bytes, idx) {
    return signed(uint40_BE(bytes, idx), 40);
}

function int16_BE(bytes, idx) {
    return signed(uint16_BE(bytes, idx), 16);
}

function ParseStatusMessage(data) {
    var decoded = {};
    decoded.version = readVersion(data, 0);
    decoded.vBat = uint16_BE(data, 5) / 1000.0;
    decoded.temp = int16_BE(data, 3) / 10.0; // byte 8-9 (originally in 10th degree C)
    decoded.msg = "Firmware Version: " + decoded.FirmwareVersion + " Battery: " + decoded.Vbat + "V Temperature: " + decoded.Temp + "°C";
    return decoded;
}

function ParseDataMessage(data) {
    return {
        "time": int40_BE(data, 0) * 1000,
        "error": !!data[5],
        "humidity": uint16_BE(data, 6) / 10.0,
        "temperature": int16_BE(data, 8) / 10.0,
        "pressure": uint16_BE(data, 10) / 10
    };
}

// Decoder function for TTN
function Decoder(bytes, port) {
    // Decode an incoming message to an object of fields.
    var decoded;

    switch (port) {
        case 1:
            decoded = ParseStatusMessage(bytes);
            break;
        case 2:
            decoded = ParseDataMessage(bytes);
            break;
        default:
            decoded = {};
    }

    return decoded;
}

// Wrapper for Lobaro Platform
function Parse(input) {
    // Decode an incoming message to an object of fields.
    var b = bytes(atob(input.data));
    var decoded = Decoder(b, input.fPort);

    if (input.fPort == 2) {
        Device.setProperty("status.firmware", decoded.FirmwareVersion);
        Device.setProperty("status.voltage", decoded.Vbat);
        Device.setProperty("status.temperature", decoded.Temp);
    }

    return decoded;
}

// Wrapper for Loraserver / ChirpStack
function Decode(fPort, bytes) {
    return Decoder(bytes, fPort);
}

/*
// Wrapper for Digimondo niota.io
module.exports = function (payload, meta) {
    const port = meta.lora.fport;
    const buf = Buffer.from(payload, 'hex');

    return Decoder(buf, port);
};
*/