Parse Bluetooth DMM Multimeter string (Baba AD-900)

parseBluetoothDMM.js

// Reference - https://github.com/ludwich66/Bluetooth-DMM/wiki/Protocol-all-Variants
// From my multimeter - Baba AD-900 (Generic name - ZOYI ZT-300AB)

// rawString = '1B-84-70-A1-49-DA-B8-7B-66-DA-3A' // few mv //mv enabled both mV and V flag
rawString = '1B-84-70-D1-3D-2B-75-7F-66-FA-3A'; // 3.764 V // enabled V flag

function zeroPad(num, places) {
  return String(num).padStart(places, '0');
} 

function getBit(str, binIndex) {
  return str[binIndex];
}

function parseRawString(rawString) {
  const rawParts = rawString.split('-').map(val => parseInt(val, 16));
  // eslint-disable-next-line max-len
  const keysXOR = [ parseInt('41', 16), parseInt('21', 16), parseInt('73', 16), parseInt('55', 16), parseInt('a2', 16), parseInt('c1', 16), parseInt('32', 16), parseInt('71', 16), parseInt('66', 16), parseInt('aa', 16), parseInt('3b', 16) ];

  // eslint-disable-next-line no-bitwise
  const partsXOR = rawParts.map((rawVal, index)=> rawVal ^ keysXOR[index]);

  const partsBin = partsXOR.map(val => val.toString(2));

  const partsBinPadded = partsBin.map(t => zeroPad(t, 8));

  const fullBinStr = partsBinPadded.join('');
  return fullBinStr;
}

let finalParsedStr = parseRawString(rawString);