homebridge-mitsubishi-wfrac/decoder/airconDecode.js

Control Mitsubishi WF-RAC AC units via Homebridge (LAN-only, no cloud required)

// decoder/airconDecode.js
export function parseIndoorTemp(base64String) {
  const decoded = Buffer.from(base64String, 'base64');
  const signed = Array.from(decoded, b => (b > 127 ? b - 256 : b));
  const start = signed[18] * 4 + 21;
  const segment = signed.slice(start + 19, signed.length - 2);

  for (let i = 0; i < segment.length - 2; i += 4) {
    const [a, b, c] = segment.slice(i, i + 3);
    if (a === -128 && b === 32) {
      return indoorTempList[c & 0xff];
    }
  }

  return null;
}

const indoorTempList = [
  -30.0, -30.0, -30.0, -30.0, -30.0, -30.0, -30.0, -30.0, -30.0, -30.0,
  -30.0, -30.0, -30.0, -30.0, -30.0, -30.0, -29.0, -28.0, -27.0, -26.0,
  -25.0, -24.0, -23.0, -22.5, -22.0, -21.0, -20.0, -19.5, -19.0, -18.0,
  -17.5, -17.0, -16.5, -16.0, -15.0, -14.5, -14.0, -13.5, -13.0, -12.5,
  -12.0, -11.5, -11.0, -10.5, -10.0, -9.5, -9.0, -8.6, -8.3, -8.0,
  -7.5, -7.0, -6.5, -6.0, -5.6, -5.3, -5.0, -4.5, -4.0, -3.6,
  -3.3, -3.0, -2.6, -2.3, -2.0, -1.6, -1.3, -1.0, -0.5, 0.0,
  0.3, 0.6, 1.0, 1.3, 1.6, 2.0, 2.3, 2.6, 3.0, 3.2,
  3.5, 3.7, 4.0, 4.3, 4.6, 5.0, 5.3, 5.6, 6.0, 6.3,
  6.6, 7.0, 7.2, 7.5, 7.7, 8.0, 8.3, 8.6, 9.0, 9.2,
  9.5, 9.7, 10.0, 10.3, 10.6, 11.0, 11.2, 11.5, 11.7, 12.0,
  12.3, 12.6, 13.0, 13.2, 13.5, 13.7, 14.0, 14.2, 14.5, 14.7,
  15.0, 15.3, 15.6, 16.0, 16.2, 16.5, 16.7, 17.0, 17.2, 17.5,
  17.7, 18.0, 18.2, 18.5, 18.7, 19.0, 19.2, 19.5, 19.7, 20.0,
  20.2, 20.5, 20.7, 21.0, 21.2, 21.5, 21.7, 22.0, 22.2, 22.5,
  22.7, 23.0, 23.2, 23.5, 23.7, 24.0, 24.2, 24.5, 24.7, 25.0,
  25.2, 25.5, 25.7, 26.0, 26.2, 26.5, 26.7, 27.0, 27.2, 27.5,
  27.7, 28.0, 28.2, 28.5, 28.7, 29.0, 29.2, 29.5, 29.7, 30.0,
  30.2, 30.5, 30.7, 31.0, 31.3, 31.6, 32.0, 32.2, 32.5, 32.7,
  33.0, 33.2, 33.5, 33.7, 34.0, 34.2, 34.5, 34.7, 35.0, 35.3,
  35.6, 36.0, 36.2, 36.5, 36.7, 37.0, 37.2, 37.5, 37.7, 38.0,
  38.3, 38.6, 39.0, 39.2, 39.5, 39.7, 40.0, 40.3, 40.6, 41.0,
  41.2, 41.5, 41.7, 42.0, 42.3, 42.6, 43.0
];