docs: function _adjustMacStrFormat(macString) {
          macString = macString.toLowerCase();
          var mac = macString.split(':');
          macString = '';
          for (var i = 0; i < mac.length; i += 1) {
              if (mac[i].length === 1) {
                  mac[i] = '0' + mac[i];
              }
              macString += mac[i];
          }
          return macString;
      }