TC2.4 - The daisy of MicroServices for Snap4City Dashboard and IOT App


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Test Case Title

TC2.4 - The daisy of MicroServices for Snap4City Dashboard and IOT App.


I can Understand the snap4City structure and possibilities in terms of microservices and smart city API to create IOT Applications, web and mobile applications, dashboards

i can start documenting myself about Snap4City Architecture in terms of MicroServices.



Access to internet to get access at snap4city 

Expected successful result

Evidence of the Snap4City Architecture is divided in a number of Service Areas, and each ares has a number tools that contribute to the system and to the production of IOT Applications and Dashboards




Snap4City has a number of tools and services which are divided in a number of Service Areas, that contribute to the system and to the production of IOT Applications and Dashboards by exposing API and Microservices.

All starts from the leg of the daisy, by using tools for creating IOT Applications, exploiting MicroServices and Dashboard.



  • Access Services: services and tools for enabling the authenticated access to data and services via some keys and certificates, according:
    • City User Directory registering, user profile management, GDPR;
    • Authentication and Authorization Support: to provide access and authorisation on the basis of the user profile.
    • usage of: LDAP, OAuth, KeyCloak, Centralized keys
    • Integration of: APP security, IOT security, IOT app security (see for example the Orion Broker Filter)
  • Knowledge Services: semantic interoperability on concepts,
    • enabling intelligence and reflection on Applications using temporal and geospatial reasonings;
    • Semantic indexing and search: textual, temporal, relational and geospatial;
    • services and tools to manage a Knowledge Base, KB, all the information of the city including: sensors, IOT/IOE, actuators, MicroServices, street and structural elements, point of interest, areas, etc.; tools for browsing, querying and working with the city Knowledge Base such as: ServiceMap, ServiceMap 3D, LOG, FLINT;
    • index and retrieve city elements by using several reasoners (Indexing and Search Services);  every time a new element is added a new entity is indexed into the KB to enable semantic search and on SOLR for data browsing and drill down;
    • index and search in all federated knowledge base with the same API and MicroServices trasnparently for the developers
    • activating new KB in different territoria area, please ask to the snap4city service  to have a new are of your interest active
    • browsing and inspecting real time data attached to KB and located on devices, and different kind of storages
    • management of data, and personal data according to GDPR;
  • Big Data Services (only save/load to some DB is available)
    • services and tools for big data storage as: big data storage on distributed HA, DRS solution for structured and non-structured data;
    • Load and save on Data Store: HDFS/Hbase via Phoenix, SOLR/ElasticSearch, Banana/Kibana, … save, access and retrieve data (for permanent and temporary data storage); 
    • perform IOT data shadow exploiting NIFI, Elastic Search and Kibana for monitoring flows;
    • collect data from external sources (DataGate/CKAN), federated CKAN with several other CKAN, please ask to have additional CKAN federated in our DataGate... 
    • drill down on data storage for IOT and ETL (Developer Dashboards, Dashbord Builder)
    • Drill down on semantic modelling and knowledge base (temporal, geospatial): FLINT for query in SPARQL, LOD, RDF endpoint, ServiceMap,">LOG.DISIT.ORG;
    • mapping data to other sources (DataMapper) for using other context data for validation and experiments;
    • annotating data sets (DataGate) and data (DataAnnotator);
    • Developer Dashboard: tools for drilling down into the data via SOLR index
    • user can save their own MyKPI, MyData, MyPOI to mark the territory, to save the experience, to annotate the area. 
    • All the data are managed accroding to GDPR.
  • IOT Sensors and Actuators Services: a set of services and tools to
    • access and listing of IOT/IOE elements into a directory (IOT Directory); They can be discovered and/or listed into a directory of sensors/actuators, using and exploiting multiple protocols to reach the devices.
    • connecting and exploiting a set of IOT Brokers that may be connected a number of sensors and actuators; Any IOT Broker (for example: IOT Orion Broker, Mosquitto, OneM2M, SigFOX, Rabbit MQ, etc.), from commercial to open source, from internal to third party, more than 50 protocols.
    • IOT Discovery, IOT Directory on a Knowledge Base with geospatial and description indexing;
    • Wrappers from transcoding protocols with other protocols;
    • Multiple IOT brokers for multiple protocols and formats;
    • Support for end-to-end secure communication from IOT to Dashboards. Several kinds of authentications and secured encrypted channel models: K1/K2 based, encrypted communication, autheintication and communication via certificates, 509:, etc. (see Orion Broker Filter, Proxy Filter Security)
    • ingestion of IOT devices in Bulk;
    • management of IOT Brokers, Devices, Values of sensors according to GDPR.
  • Traditional Web and Mobile App Services: a set of services and tools for preparing data for the Advanced Smart City API:
    • exploiting Smart City Solution via Advanced Smart City API and MicroServices;
    • communicating with users on their Web and Mobile Apps;
    • monitoring their behaviour (according to the informed consent) enriching City User profile (City User Directory);
    • developing web and mobile Apps (App Development Kit, ADK), for Snap4City Mobile App developers, HTML5 and JavaScript based;
    • engaging city users (Engagement Service, Engager); exploiting User Behaviour Understanding and collection of data, providing contextualized engagement to the users on Mobile and Web Apps. 
    • using ServiceMap tool for generating REST Call tyo be exploited in web and mobile applications
    • Web applications are also available as MicroApplications: also exploiting engagements, routing, etc. 
  • Dashboard Services
    • services for informing city users, Mobiles, Panels via: rendering data via multiple views/widgets: graphs, tables, maps, direct values, numbers, kiviat, trends, etc.;
    • specific Widgets for collecting data from the users as sliders, text box, switches, etc.;
    • Dashboards for all kinds of needs: controlling the city, for developer and for final users, personal dashboard.
    • highly scalable on massive data rendering and H24/7 show on city operator, and Control Room
    • direct connection of Dashboard with IOT Applications, and with IOT Devices. You just need to create the Dashboard for showing and acting on sensors and Actuators. 
    • last collection of graphics widgets for creating dashboards in few clicks by using the Dashboard Wizard
  • Notification Services: (multichannel multimodal notification system, scalable)
    • services and tools (Notificator) to send notification and alerts to City Users and operators about the events of critical conditions according to a City User Directory.
    • notifications may reach the users by using multiple channels: email, phone, SMS, etc.
    • Different notification models and tools for user kind and contexts
    • notification flexible are performed into IOT Applications, which can send SMS, email, alerts on dashboard, Telegram, Facebook Post, etc. 
  • External Services connecting any external service: social media, routing, heatmaps, REST Call, etc. by Sync/Async
    • services and tools for connecting external services. An example is the connection and exploitation of services of Twitter Vigilance as Social Media Service: a service to get Tweets and related metrics and data analytics tool, also capable to computer specific metrics, natural language processing, and sentiment analysis.
    • Services can be reached with REST call, WS, etc.
    • a large collection of ExternalServices have been registered. AreaManagers can register their own externalservices.
    • ExternalServices as REST CALL can be also transformed easily in MicroServices for IOT Applications, so that to be used into your data transformations.
  • ETL Process Services: (for batch data ingestion and publication, transformation), Sync/Async, highly scalable
    • services performing data transformations in batch on a parallel and distributed architecture, exploiting a mixt of solutions: Penthao Kettle, native language modules in R, Java, Python, etc.,
      • Data gathering, data crawling, GTFS processing, DATEX, etc.
      • Batch processing, massive processing
    • Creating them via Visual programming, connection with Big Data (that is Penthao Kettle editor)
    • executing them by means of the Computation Management Services, on the cloud infrastructure, in connection with Data Analytic Services;
    • tools for their development in a sandbox the Data Processing Development Environment.
  • Data Analytic Services: Sync/Async, highly scalable.
    • services implementing vertical algorithms such as: traffic flow reconstruction, parking free lot prediction, user behaviour analysis, routing (with several different parameters), traffic flow prediction, etc.;
    • executing them by means of the Computation Management Services, on the cloud infrastructure, in connection with ETL Process Services;
    • tools for their development in a sandbox the Data Processing Development Environment.
    • Any analytics language and environment: R, Java, Python, Scala, R Studio, R Parallel, Machine Learning, Spark ML, Spark (available)
    • Multiple Paradigm: R-Studio, R-Parallel, MapReduce, GPU Tensor Flow, etc.
    • DataAnalytics algorithms in R-Studio can be easily registered as MicroServices to be used and exploited into IOT Applications with your dedicated and custom DataAnalytics.
    • Process Scheduling and Management via DISCES tool
  • Computation Management Services: The typical smart city infrastructure may have several kinds of processes (period or sporadic, stream or batch), allocated on cloud (Virtual Machine) or on IOT Edge Computer, or even on external services (other public and private cloud, and/or third-party servers of some kind). They are services for controlling the execution of processes
    • allocate and put in execution the different kinds of processes in any easy and transparent manner for the developers where they can be successfully executed (via DISCES),
    • monitor their execution (Application Deployer and Resource Manager),
    • allow process upload and monitoring results (Process Upload, Resource Manager).
    • process management, resource management, elastic computing

 All the management aspects are not described in this view.

Many other details are accessible in the documentation of thhe Smart City API, and in the list of MicroServices 

We suggest you to follow these examples and readings in the order: