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Semantic-Service Provisioning for the Internet of Things using Future Internet Research by Experimentation   www.spitfire-project.eu




                                    Smart Service Proxy
               Oliver Kleine, Henning Hasemann, Alexander
                                  Kroeller
Initial situation

   Diverse network types (Internet (www), WSN)
   Diverse protocol standards




                              Proprietary
                              communication
Target situation


                   HTTP/TCP endpoints
                   in WSNs not possible
                   due to resource constraints!
Semantic Entities
Semantic Entities
SE types: Service-Level SE
SLSE Construction
Se Types: In-Network SE
INSE Construction
The CoAP protocol

   IETF-draft (developed by CoRE working group)
   Lightweight alternative to HTTP
       GET/POST/PUT/DELETE for RESTful service provisioning
       Optional transport reliability
   Some main features (from draft-ietf-coap-07):
       UDP-binding with optional reliability
       Supporting unicast and multicast messages
       Asynchronous message exchanges
       Low Header-Overhead
       URI and content-type support
       Simple proxy and caching capabilities
       Stateless HTTP mapping
CoAP devices

   CoAP on Sensor Nodes
       RESTful webservices
         – Current values of sensors
         – Semantic self-descriptions (from WP 2)
       Accessable by any CoAP-Client from anywhere

   CoAP-Client for JAVA and Android
       Enable CoAP on a wide range of potential client devices


   Smart Service Proxy
       Caching of current values and self-descriptions
       Enables HTTP access to CoAP-services
The Smart Service Proxy

   Developed in cooperation between WP1 and WP3



   Border device WSN <-> Internet
       HTTP/TCP endpoint from internet perspective
       CoAP/UDP endpoint from WSN perspective



   Several Backends
       CoAP Backend (Translation HTTP <-> CoAP)
       SLSE Backend
       Any other backend
SSP: Network environment
SSP: More detailed insight

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Smart Service Proxy

  • 1. Semantic-Service Provisioning for the Internet of Things using Future Internet Research by Experimentation www.spitfire-project.eu Smart Service Proxy Oliver Kleine, Henning Hasemann, Alexander Kroeller
  • 2. Initial situation  Diverse network types (Internet (www), WSN)  Diverse protocol standards Proprietary communication
  • 3. Target situation HTTP/TCP endpoints in WSNs not possible due to resource constraints!
  • 10. The CoAP protocol  IETF-draft (developed by CoRE working group)  Lightweight alternative to HTTP  GET/POST/PUT/DELETE for RESTful service provisioning  Optional transport reliability  Some main features (from draft-ietf-coap-07):  UDP-binding with optional reliability  Supporting unicast and multicast messages  Asynchronous message exchanges  Low Header-Overhead  URI and content-type support  Simple proxy and caching capabilities  Stateless HTTP mapping
  • 11. CoAP devices  CoAP on Sensor Nodes  RESTful webservices – Current values of sensors – Semantic self-descriptions (from WP 2)  Accessable by any CoAP-Client from anywhere  CoAP-Client for JAVA and Android  Enable CoAP on a wide range of potential client devices  Smart Service Proxy  Caching of current values and self-descriptions  Enables HTTP access to CoAP-services
  • 12. The Smart Service Proxy  Developed in cooperation between WP1 and WP3  Border device WSN <-> Internet  HTTP/TCP endpoint from internet perspective  CoAP/UDP endpoint from WSN perspective  Several Backends  CoAP Backend (Translation HTTP <-> CoAP)  SLSE Backend  Any other backend