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Context Data Update for Location Provider

This example demonstrates updating location data for a specific entity using Context Broker services.

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Context Data Update for Location Provider

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  1. Context Broker GE (R2.3): examples Sergio Rolando: sergio.rolando@guest.telecomitalia.it

  2. ContextML contextUpdate http://pubsub.lab.fi-ware.eu/CB/ContextBroker/contextUpdate(POST with body, content-type: “application/xml”) <?xml version="1.0" encoding="UTF-8"?> <contextML> <ctxEls> <ctxEl> <contextProvider id="MyClient" v="1.2.1"/> <entity id="123456789123" type="imei"/> <scope>position</scope> <timestamp>2012-05-20T11:12:19+01:00</timestamp> <expires>2012-05-20T11:21:22+01:00</expires> <dataPart> <par n="latitude">45.11045277777778</par> <par n="longitude">7.675251944444445</par> <par n="accuracy">50</par> <par n="locMode">GPS</par> </dataPart> </ctxEl> </ctxEls> </contextML>

  3. ContextML getContext http://pubsub.lab.fi-ware.eu/CB/ContextBroker/getContext?entity=imei|123456789123&scopeList=position Response: <?xml version="1.0" encoding="UTF-8"?> <contextML xmlns="http://ContextML/1.7" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://ContextML/1.7 http://contextml.tilab.com/ContextML-1.7.xsd"> <timeRef>2012-11-12T16:37:30+01:00</timeRef> <ctxEls> <ctxEl> <contextProvider id="MyClient" v="1.2.1"/> <entity id="123456789123" type="imei"/> <scope>position</scope> <timestamp>2012-11-12T16:37:24+01:00</timestamp> <expires>2012-11-12T16:46:27+01:00</expires> <dataPart> <par n="latitude">45.11045277777778</par> <par n="longitude">7.675251944444445</par> <par n="accuracy">50</par> <par n="locMode">GPS</par> </dataPart> </ctxEl> </ctxEls> </contextML>

  4. NGSI updateContext: UPDATE action <?xml version="1.0" encoding="UTF-8"?> <updateContextRequest> <contextElementList> <contextElement> <entityId> <id>urn:username:sergio</id> </entityId> <contextAttributeList> <contextAttribute> <name>cell</name> <contextValue>222-1-61101-7066</contextValue> <metadata> <contextMetadata> <name>Timestamp</name> <value>2012-06-13T15:04:52+01:00</value> </contextMetadata> <contextMetadata> <name>Expires</name> <value>2012-06-13T15:06:52+01:00</value> </contextMetadata> <contextMetadata> <name>Source</name> <value>teamlife_1.0</value> </contextMetadata> </metadata> </contextAttribute> </contextAttributeList> </contextElement> </contextElementList> <updateAction>UPDATE</updateAction> </updateContextRequest> http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/updateContext  urn:[entity_type]:[entity_id]

  5. NGSI queryContext <?xml version="1.0" encoding="UTF-8"?> <queryContextRequest> <entityIdList> <entityId> <id>urn:username:cristinaF</id> </entityId> <entityId> <id>urn:username:sergio</id> </entityId> </entityIdList> <attributeList> <attribute>cell</attribute> </attributeList> <restriction> <attributeExpression>//contextAttribute[starts-with(contextValue,'222')]</attributeExpression> </restriction> </queryContextRequest> http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/queryContext

  6. Convenience functions  updateContext <?xml version="1.0" encoding="UTF-8"?> <updateContextElementRequest> <contextAttributeList> <contextAttribute> <name>cell</name> <contextValue>10</contextValue> <metadata> <contextMetadata> <name>Timestamp</name> <value>2012-10-24T18:22:30+02:00</value> </contextMetadata> <contextMetadata> <name>Expires</name> <value>2012-10-25T18:22:30+02:00</value> </contextMetadata> <contextMetadata> <name>Source</name> <value>testApp_1.0</value> </contextMetadata> </metadata> </contextAttribute> <contextAttribute> <name>position</name> <contextValue>20</contextValue> <metadata> <contextMetadata> <name>Timestamp</name> <value>2012-10-24T18:22:30+02:00</value> </contextMetadata> http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/contextEntities/urn:username:sergio (HTTP PUT) ... <contextMetadata> <name>Expires</name> <value>2012-10-25T18:22:30+02:00</value> </contextMetadata> <contextMetadata> <name>Source</name> <value>testApp_1.0</value> </contextMetadata> </metadata> </contextAttribute> </contextAttributeList> </updateContextElementRequest>

  7. Convenience functions  queryContext • http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/contextEntities/urn:username:sergio (HTTP GET) • http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/contextEntities/urn:username:sergio/attributes/cell (HTTP GET) • http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/contextEntityTypes/urn:username/attributes/cell (HTTP GET) Convenience functions  updateContext DELETE • http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/contextEntities/urn:username:sergio (HTTP DELETE) • http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/contextEntities/urn:username:sergio/attributes/cell (HTTP DELETE)

  8. NGSI subscribeContext (1) • http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/contextSubscriptions (HTTP POST) • http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/subscribeContext (HTTP POST) <?xml version="1.0" encoding="UTF-8"?> <subscribeContextRequest> <entityIdList> <entityId type="urn:username" isPattern="false"> <id>urn:username:sergio</id> </entityId> </entityIdList> <attributeList> <attribute>cell</attribute> </attributeList> <reference>http://127.0.0.1:8080/CB/ContextBroker/testCallback</reference> <duration>PT300S</duration> <restriction> <attributeExpression>//contextAttribute/metadata/contextMetadata[name='Timestamp']/value</attributeExpression> </restriction> </subscribeContextRequest> <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <subscribeContextResponse> <subscribeResponse> <subscriptionId>82200cca-0aa4-422b-95ea-138b98cb1fc2</subscriptionId> <duration>PT300S</duration> </subscribeResponse> </subscribeContextResponse> Response

  9. NGSI subscribeContext (2): ONCHANGE condition • http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/contextSubscriptions (HTTP POST) • http://pubsub.lab.fi-ware.eu/ngsicbapi/NGSI10/subscribeContext (HTTP POST) <?xml version="1.0" encoding="UTF-8"?> <subscribeContextRequest> <entityIdList> <entityId> <id>urn:username:sergio</id> </entityId> </entityIdList> <attributeList> <attribute>cell</attribute> </attributeList> <reference>http://127.0.0.1:8080/CB/ContextBroker/testCallback</reference> <duration>PT5M</duration> <notifyConditions> <notifyCondition> <type>ONCHANGE</type> <condValueList> <condValue>cell</condValue> <condValue>position</condValue> </condValueList> </notifyCondition> </notifyConditions> </subscribeContextRequest> <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <subscribeContextResponse> <subscribeResponse> <subscriptionId>82200cca-0aa4-422b-95ea-138b98cb1fc2</subscriptionId> <duration>PT300S</duration> </subscribeResponse> </subscribeContextResponse> Response

  10. CQL subscription http://pubsub.lab.fi-ware.eu/CB/ContextBroker/getContextQL (HTTP POST with parameters, content-type=“application/x-www-form-urlencoded”) cqlReq=<?xml version="1.0" encoding="UTF-8"?> <contextQL xmlns="http://ContextQL/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://ContextQL/1.1 http://cark3.cselt.it/schemas/ContextQL-1.1.xsd"> <ctxQuery> <action type="SUBSCRIBE" /> <entity>username|cristinaF</entity> <scope>cell</scope> <validity>180</validity> </ctxQuery> </contextQL>&callbackUrl=http://127.0.0.1:8080/CB/ContextBroker/testCallback <?xml version="1.0" encoding="UTF-8"?> <contextML xmlns="http://ContextML/1.7" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://ContextML/1.7 http://contextml.tilab.com/ContextML-1.7.xsd"> <ctxResp> <contextProvider id="CB" v="1.4.5"/> <timestamp>2012-11-13T16:35:35+01:00</timestamp> <method>getContextQL</method> <resp status="OK" code="200"/> <validity>180</validity> <subId>62</subId> </ctxResp> </contextML> Response

  11. NGSI-9 registerContext (1) http://pubsub.lab.fi-ware.eu/NGSI9/registerContext (HTTP POST) <?xml version="1.0" encoding="UTF-8"?> <registerContextRequest> <contextRegistrationList> <contextRegistration> <entityIdList> <entityId> <id>urn:username:sergio</id> </entityId> <entityId> <id>urn:username:cristina</id> </entityId> </entityIdList> <contextRegistrationAttributeList> <contextRegistrationAttribute> <name>cell</name> </contextRegistrationAttribute> </contextRegistrationAttributeList> <providingApplication>http://localhost:8080/ngsicbapi/testProvider</providingApplication> </contextRegistration> </contextRegistrationList> <duration>PT3000S</duration> <registrationId>b56a91aa-a552-487a-ac8b-1ed025969c4e</registrationId> </registerContextRequest> <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <registerContextResponse> <registrationId>b56a91aa-a552-487a-ac8b-1ed025969c4e</registrationId> </registerContextResponse> Response

  12. NGSI-9 registerContext (2) http://pubsub.lab.fi-ware.eu/NGSI9/contextEntities/urn:username:sergio/attributes/cell (HTTP POST) <?xml version="1.0" encoding="UTF-8"?> <registerProviderRequest> <duration>PT300S</duration> <providingApplication>http://localhost:8080/ngsicbapi/testProvider</providingApplication> </registerProviderRequest> <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <registerContextResponse> <registrationId>b56a91aa-a552-487a-ac8b-1ed025969c4e</registrationId> </registerContextResponse> Response

  13. Further stuff... • NGSI/ContextML cross working (e.g ContextML update NGSI queryContext) • NGSI subscription renew/delete • JSON in the beginning: • Content-Type: application/json;charset=UTF-8 • Accept: application/json;charset=UTF-8 • ....

  14. References • OMA NGSI Spec: • http://www.openmobilealliance.org/Technical/release_program/docs/NGSI/V1_0-20101207-C/OMA-TS-NGSI_Context_Management-V1_0-20100803-C.pdf • FIWARE NGSI Open RESTFul API Specification: • http://forge.fi-ware.eu/plugins/mediawiki/wiki/fiware/index.php/FI-WARE_NGSI_Open_RESTful_API_Specification_(PRELIMINARY) • Questions, etc... : • sergio.rolando@guest.telecomitalia.it

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