code: function() {
      return [
          utils.generateRandomHex(8),
          utils.generateRandomHex(4),
          utils.generateRandomHex(4),
          utils.generateRandomHex(4),
          utils.generateRandomHex(12)
      ].join('-');
  }
docs: /*
  create random invokeid.
  Assuming that invokeid follows the format:
  8hex-4hex-4hex-4hex-12hex