function Decoder(bytes, port) {
  const decoded = [];
  // status message
  if (port !== 103) return [{ variable: "parse_error", value: "Parser error: Port must be 103" }];
  if (bytes.length !== 11) return [{ variable: "parse_error", value: "Parser error: Bytes length doesn't match" }];
  // status -- byte 0
  decoded.push({ variable: "status_event", value: bytes[0] & 0x01 });
  decoded.push({ variable: "status_type", value: ((bytes[0] >> 3) & 0x01) ? "Temperature and Humidity sensor" : "IAQ Sensor" });
  decoded.push({ variable: "status_temperature_change", value: (bytes[0] >> 4) & 0x01 });
  decoded.push({ variable: "status_humidity_change", value: (bytes[0] >> 5) & 0x01 });
  decoded.push({ variable: "status_iaq_change", value: (bytes[0] >> 6) & 0x01 });
  // battery -- byte 1 (1 to 14)
  if ([0, 15].includes(bytes[1] & 0x0F)) return [{ variable: "parse_error", value: "Parser error: Battery must be between 2.6 and 3.9 V" }];
  decoded.push({ variable: "battery", value: (25 + (bytes[1] & 0x0F)) / 10, unit: "V" });
  // temp (pcb) -- byte 2
  decoded.push({ variable: "board_temperature", value: (bytes[2] & 0x7F) - 32, unit: "°C" });
  // rh -- byte 3 (max 100)
  if ((bytes[3] & 0x7F) > 100) return [{ variable: "parse_error", value: "Parser error: Max value for humidity is 100%" }];
  decoded.push({ variable: "humidity", value: bytes[3] & 0x7F, unit: "%" });
  // co2 -- bytes 4, 5
  decoded.push({ variable: "eco2", value: bytes.readUInt16BE(4), unit: "ppm" });
  // voc -- bytes 6, 7
  decoded.push({ variable: "voc", value: bytes.readUInt16BE(6), unit: "ppm" });
  // iaq -- bytes 8, 9 (0 to 500)
  if (bytes.readUInt16BE(8) > 500) return [{ variable: "parse_error", value: "Parser error: Max value for IAQ is 500" }];
  decoded.push({ variable: "iaq", value: bytes.readUInt16BE(8) });
  // environment temp -- byte 10
  decoded.push({ variable: "environment_temperature", value: (bytes[10] & 0x7F) - 32, unit: "°C" });


  return decoded;
}

// let payload = [{ variable: "payload", value: "790a2a5f2744274427442a" }, { variable: "port", value: "103" }];
// let payload = [{ variable: "payload", value: "79ffffffffffffffffffff" }, { variable: "port", value: "103" }];

const data = payload.find((item) => item.variable === "data" || item.variable === "payload" || item.variable === "payload_raw" );
const port = payload.find((item) => item.variable === "port" || item.variable === "fport" );

if (data) {
  const bytes = Buffer.from(data.value, "hex");
  const serie = new Date().getTime();
  payload = payload.concat(Decoder(bytes, Number(port.value))).map((x) => ({ ...x, serie }));
}

// console.log(payload);