code: public MessageStatus publish( Object message, PublishOptions publishOptions )
    {
      return publish( null, message, publishOptions );
    }
docs: Publishes message to "default" channel. The message is not a push notification, it does not have any headers and
  does not go into any subtopics.
  
  @param message        object to publish. The object can be of any data type - a primitive value, String, Date, a
  user-defined complex type, a collection or an array of these types.
  @param publishOptions an instance of ${@link com.backendless.messaging.PublishOptions}. When provided may contain
  publisher ID (an arbitrary, application-specific string value identifying the publisher),
  subtopic value and/or a collection of headers.
  @return a data structure which contains ID of the published message and the status of the publish operation.
  @throws BackendlessException