code: function uint16BEtoNumber(bytes) {
    var n = 0;
    for (var i = 0; i < 1; i++) {
      n |= bytes[i];
      n <<= 8;
    }
    n |= bytes[1];
    return n;
  }
docs: read in uint16BE Bytes return uint16 number
  @param {Buffer} bytes Big-endian byte buffer