Tizen/Artik IoT Lecture Chapter 11. IoTivity Resource Hosting & Resource Directory

Transcription

1 1 Tizen/Artik IoT Lecture Chapter 11. IoTivity Resource Hosting & Resource Directory Sungkyunkwan University

2 Contents 2 Resource Hosting Design Resource Hosting in IoTivity Discovery: OICStartCoordinate() Resource Directory Topology Resource Directory API Execution Flow Sample

3 Resource Hosting The IoTivity service to off-load the requests to the resources in thin device 3

4 Resource Hosting Design 4 Transfer the origin resource to ResourceHosting Subscribe the origin resource from the ResourceHosting (Observe) Make the origin resource non-discoverable It cannot be discovered from other service than ResourceHosting Thin Device Origin Server 2. Register Resource { "href":a/light "rt": {"oic.r.light",.} "if": {"oic.if.baseline"} "p": { Discoverable, Observable} } 3. DISCOVER_MULTICAST GET "oic/res?rt=oic.wk.rh" 5. PUBLISH POST rep: { "uri: a/light" "rt": {"oic.r.light", } "if": {"oic.if.baseline"} Content"rt=oic.wk.rh " Rich Device ResourceHosting 4. RESPONSE 7. SUBSCRIBE GET a/light Observe 8. RESPONSE [POST] 9. Update Resource Policy { "href": a/light, "rt": {"oic.r.light", } "if": {"oic.if.baseline"} "p": {Non-Discoverable, Observable} 1. Register Resource { "href":"rh/coordinator" "rt": {"oic.wk.rh"} "if": {"oic.if.baseline"} "p": { Discoverable} } 6. Register Resource { "href": a/light, "rt": {"oic.r.light", } "if": {"oic.if.baseline"} "p": {Discoverable, Observable}

5 Resource Hosting in IoTivity 5 RemoteResource startmonitoring() RemoteResource startcaching() ResourceHosting observes and caches the origin resource and transfers the cached resource to the consumer Maintain the Mirror Server (Not same resource) 1 Resource1 Resource2 2 Resource2 Resource3 ResourceHosting Hosting Resource1 Hosting Resource2 Hosting Resource3 Hosting Resources Caching Monitoring Remote Resource1 (Origin Server) Remote Resource2 (Origin Server) Remote Resource3 (Origin Server)

6 Resource Hosting API 6 OICStartCoordinate () Execute ResourceHosting Service Discover the RemoteResource of which the type is oic.r.resourcehosting and generates the hosting thread OICStopCoordinate () Release the caching and observation information and terminate the ResourceHosting therad

7 Discovery: OICStartCoordinate() OICStartCoordinate() 7 HostingAPI ResourceHosting RCSDiscoveryManager starthosting () creatediscoverylistener () ResourceHosting Service multicasts discovery request "oic.r.resourcehosting" discoverresourcebytype (HOSTING_RESOURCE_TYPE) RCSRemoteResourceObject discoveryhandler (remoteresource) EVENT (Resource found!) createhostingobject (remoteresource) startmonitoring (remoteresource) startcaching (remoteresource) EVENT (datachanged) changeattribute (HostingResource)

8 Sample Resource Hosting 8 Source: iotivity/service/resource-hosting Sample consists of 3 applications Sample, Sample ResourceHosting, Sample Provider ResourceHosting 2 TEMP Connect Hosting Resource(TEMP) Hosting Resources Caching Found Monitoring Discovery TEMP Server

9 Resource Directory 9 Similar concept, but developed from different project thread Resource Directory processes the request to thin device instead RD Device Query Client Thin Device

10 Topology 10 Resource Hosting (Mirrored Server) 2 TEMP Subscribe oc/res/temp1 oc/res/temp1 ResourceHosting Discover Register Resource Directory (Cached Server) oc/res/temp1/hosting TEMP Server 2 TEMP Subscribe oc/res/temp1 oc/res/temp1 (cached) ResourceDirectory Discover Publish oc/res/temp1 TEMP Server

11 Resource Directory API 11 iotivity/service/resource-directory/ Client API (Publisher / Thin Device) OCRDDiscover () OCRDPublish () Server API (Resource Directory Server) OCRDStart () OCRDStop ()

12 Resource Directory Flow 12 Query Client Resource Directory Thin Device OCRDStart () OCRDDiscover () OCRDPublish() handlepublishrequest() OCRDStorePublishedResources () handlepublishcb () OCStopMulticastServer () OCFindResource (MULTICAST) Multicast Server CAPI No response #ifdef WITH_RD sendresponse () BuildVirtualReso urceresponse ()

13 Sample Resource Directory Source: iotivity/service/resource-directory/samples Sample consists of 3 applications rd_main / rd_publishingclient / rd_queryclient QueryClient LIGHT Discover /a/light (MULTICAST) VirtualResponse ResourceDirectory Discover Publish /a/thermostat /a/light Thin Device /a/thermostat /a/light