code: public String checkMessagingConnectionForTheDm( String message )
  	throws DebugWsException {
  
  		this.logger.finer( "Checking messaging connection with the DM: message=" + message );
  
  		WebResource path = this.resource.path( UrlConstants.DEBUG ).path( "check-dm" );
  		if( message != null )
  			path = path.queryParam( "message", message );
  
  		ClientResponse response = this.wsClient.createBuilder( path ).get( ClientResponse.class );
  		if( Family.SUCCESSFUL != response.getStatusInfo().getFamily()) {
  			String value = response.getEntity( String.class );
  			this.logger.finer( response.getStatusInfo() + ": " + value );
  			throw new DebugWsException( response.getStatusInfo().getStatusCode(), value );
  		}
  
  		this.logger.finer( String.valueOf( response.getStatusInfo()));
  		return response.getEntity( String.class );
  	}
docs: Checks the DM is correctly connected with the messaging server.
  @param message a customized message content
  @return the content of the response