code: public ClientNetworkConfig addOutboundPortDefinition(String portDef) {
          if (outboundPortDefinitions == null) {
              outboundPortDefinitions = new HashSet<String>();
          }
          outboundPortDefinitions.add(portDef);
          return this;
      }
docs: Add outbound port definition to the outbound port definition list
  
  @param portDef outbound port definition
  @return ClientNetworkConfig