public override void Invoke(AWSCredentials creds, RegionEndpoint region, int maxItems)
        {
            AmazonRoboMakerConfig config = new AmazonRoboMakerConfig();
            config.RegionEndpoint = region;
            ConfigureClient(config);            
            AmazonRoboMakerClient client = new AmazonRoboMakerClient(creds, config);
            
            ListRobotsResponse resp = new ListRobotsResponse();
            do
            {
                ListRobotsRequest req = new ListRobotsRequest
                {
                    NextToken = resp.NextToken
                    ,
                    MaxResults = maxItems
                                        
                };

                resp = client.ListRobots(req);
                CheckError(resp.HttpStatusCode, "200");                
                
                foreach (var obj in resp.Robots)
                {
                    AddObject(obj);
                }
                
            }
            while (!string.IsNullOrEmpty(resp.NextToken));
        }