code: function decode(events) {
    let indexList = [];
    let eventsByte = parseInt(events, 16);
  
    if(eventsByte & APPEARANCE_MASK) {
      indexList.push(APPEARANCE);
    }
    if(eventsByte & DISPLACEMENT_MASK) {
      indexList.push(DISPLACEMENT);
    }
    if(eventsByte & PACKETS_MASK) {
      indexList.push(PACKETS);
    }
    if(eventsByte & KEEPALIVE_MASK) {
      indexList.push(KEEPALIVE);
    }
    if(eventsByte & DISAPPEARANCE_MASK) {
      indexList.push(DISAPPEARANCE);
    }
  
    return indexList;
  }
docs: Decode the given hexadecimal string byte as an index list of events.
  @param {String} rssi The given events as a bitmask hexadecimal string.
  @return {Array} The corresponding index list of events.