GENA (General Event Notification Architecture)

RTLAB이 남 지

2003/01/08

Agenda

What is GENA? Protocol Stack GENA HTTP Methods Event Sequence

What is GENA?

Send and receive notifications using HTTP over TCP/IP and administratively-scoped multicast UDP

Main component Publisher and Subscriber

Protocol Stack

UPnP vendor

UPnP Forum

UPnP Device Architecture

HTTP GENA

TCP

IP

UPnP vendor

UPnP Forum

UPnP Device Architecture HTTPMU (multicast)

GENA

SSDP

HTTPMU (multicast)

UDP

IP

Discovery Event

GENA HTTP Methods

SUBSCRIBE to notification UNSUBSCRIBE NOTIFY

Of device availability (discovery) Of state variable changes

Event Sequence - SUBSCRIBE

Subscription request

SUBSCRIBE /upnp/event/tvpicture1 HTTP/1.1HOST: 155.230.14.177:5431CALLBACK: <http://155.230.14.177:5432/>NT: upnp:eventTIMEOUT: Second-1800

Root device

Service(publisher)

C.P.

(subscriber)

Subscription(uuid:…)

HTTP/1.1 200 OKDATE: Fri, 03 Jan 2003 01:04:59 GMTSERVER: Linux/2.4.18-3 UPnP/1.0 Intel UPnP SDK/1.0SID: uuid:dafba47f-3159-4b23-8a52-b463e77a4454TIMEOUT: Second-1800

Event Sequence - NOTIFYNOTIFY / HTTP/1.1HOST: 155.230.14.177:5432CONTENT-TYPE: text/xmlCONTENT-LENGTH: 214NT: upnp:eventNTS: upnp:propchangeSID: uuid:b4bec083-386b-41f4-9659-2ccfb8b75ac5SEQ: 0

<e:propertyset xmlns:e="urn:schemas-upnp-org:event-1-0"><e:property><Power>0</Power></e:property><e:property><Channel>1</Channel></e:property><e:property><Volume>5</Volume></e:property></e:propertyset>

Event message

HTTP/1.1 200 OK

response

Root device

Service(publisher)

C.P.

(subscriber)

Event Sequence – Renewing Subscription

Root device

Service(publisher)

C.P.

(subscriber)

Renewal request(uuid:…)

SUBSCRIBE publisher path HTTP/1.1HOST: publisher host:publisher portSID: uuid:subscription UUIDTIMEOUT: Second-requested subscription duration

Subscription(uuid:…)

HTTP/1.1 200 OKDATE: Fri, 03 Jan 2003 01:04:59 GMTSERVER: Linux/2.4.18-3 UPnP/1.0 Intel UPnP SDK/1.0SID: uuid:dafba47f-3159-4b23-8a52-b463e77a4454TIMEOUT: Second-1800

Event Sequence - UNSUBSCRIBE

Root device

Service(publisher)

C.P.

(subscriber)

Unsubscription request

UNSUBSCRIBE /upnp/event/tvcontrol1 HTTP/1.1HOST: 155.230.14.177:5431SID: uuid:b4bec083-386b-41f4-9659-2ccfb8b75ac5

Unsubscription(uuid:…)

HTTP/1.1 200 OK

Root Device

service Device

Device Service

•NT •USN *

•1•root device UUID

•root device UUID

•2•device type : device version

•root device UUID and :: and device type : device version

•3 •upnp:rootdevice•root device UUID and :: and upnp:rootdevice

•Two discovery messages for each embedded device.

•NT •USN *

•1•embedded device UUID

•embedded device UUID

•2•device type : device version

•embedded device UUID and :: and device type : device version

•Once for each service.

•NT •USN *

•1•service type : service version

•enclosing device UUID and :: and service type : service version

•Three discovery messages for the root device.

Advertisement device - alive

NOTIFY * HTTP/1.1HOST: 239.255.255.250:1900CACHE-CONTROL: max-age=1800LOCATION: http://155.230.14.177:5431/tvdevicedesc.xmlNT: upnp:rootdeviceNTS: ssdp:aliveSERVER: Linux/2.4.18-3 UPnP/1.0 Intel UPnP SDK/1.0USN: uuid:Upnp-TVEmulator-1_0-1234567890001::upnp:rootdevice

NOTIFY * HTTP/1.1HOST: 239.255.255.250:1900CACHE-CONTROL: max-age=1800LOCATION: http://155.230.14.177:5431/tvdevicedesc.xmlNT: uuid:Upnp-TVEmulator-1_0-1234567890001NTS: ssdp:aliveSERVER: Linux/2.4.18-3 UPnP/1.0 Intel UPnP SDK/1.0USN: uuid:Upnp-TVEmulator-1_0-1234567890001

NOTIFY * HTTP/1.1HOST: 239.255.255.250:1900CACHE-CONTROL: max-age=1800LOCATION: http://155.230.14.177:5431/tvdevicedesc.xmlNT: urn:schemas-upnp-org:device:tvdevice:1NTS: ssdp:aliveSERVER: Linux/2.4.18-3 UPnP/1.0 Intel UPnP SDK/1.0USN: uuid:Upnp-TVEmulator-1_0-1234567890001::urn:schemas-upnp-org:device:tvdevice:1