@@ -207,7 +207,7 @@ Both directions of the data flow between OGC/STA server and the IPE need their o
In Figure 6.3.1.1-1 an OGC/STA client is connected to an OGC/STA server and its data is forwarded to the IPE. The OGC/STA client publishes data to the OGC/STA server via a HTTP-Post message. The 'result' attribute of an "Observation" contains the sensor data.
An "Observation" according to STA Sensing Entities Data Model <ahref="#_ref_i.1">[i.1]</a> belongs to a "Datastream" (see Figure 5-2).
The IPE needs to subscribe to the relevant "Datastream" at the MQTT-Broker of the OGC/STA Server using its specific URL or topic like e.g. {"sta-example-server-address.com/v1.0/Datastreams(8715)"}. After doing that the IPE receives every "Observation" that is pushed to that "Datastream".
The IPE shall subscribe to the relevant "Datastream" at the MQTT-Broker of the OGC/STA Server using its specific URL or topic like e.g. {"sta-example-server-address.com/v1.0/Datastreams(8715)"}. After doing that the IPE receives every "Observation" that is pushed to that "Datastream".
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@@ -215,11 +215,11 @@ The IPE needs to subscribe to the relevant "Datastream" at the MQTT-Broker of th
#### 6.3.1.2 Communication direction IPE towards OGC/STA Server
The IPE requires a destination-"Datastream" in order to send an "Observation". In case there is no associated "Datastream" on the OGC/STA server it MUST be created. This MAY be done beforehand or at start-up time of the IPE and is up to the implementation.
The IPE requires a destination-"Datastream" in order to send an "Observation". In case there is no associated "Datastream" on the OGC/STA server it shall be created. This may be done beforehand or at start-up time of the IPE and is up to the implementation.
When a "Datastream" is created at the OGC/STA server a reference ID (e.g. {"@iot.id:3635353"}) is given back.
This reference is needed by the IPE to relate an "Observation" to a "Datastream" and MUST be available during IPE operation. Appart from the "Datastream" additional entities of the OGC data model like e.g. "Location" or "Sensor" MAY be created.
This reference is needed by the IPE to relate an "Observation" to a "Datastream" and shall be available during IPE operation. Appart from the "Datastream" additional entities of the OGC data model like e.g. "Location" or "Sensor" may be created.
The creation of entities like "Datastream" and "Thing" requires a number of mandatory properties that shall be known at configuration time, e.g. 'name' and 'description'. These property fields MAY automatically derived e.g. from the "Label" or "ResourceName" attributes of the regarded oneM2M `<AE>` or `<container>` during IPE configuration. The OGC/STA procedures for creating OGC entities are described in SensorThing API documentation <ahref="#_ref_i.1">[i.1]</a>.
The creation of entities like "Datastream" and "Thing" requires a number of mandatory properties that shall be known at configuration time, e.g. 'name' and 'description'. These property fields may automatically derived e.g. from the "Label" or "ResourceName" attributes of the regarded oneM2M `<AE>` or `<container>` during IPE configuration. The OGC/STA procedures for creating OGC entities are described in SensorThing API documentation <ahref="#_ref_i.1">[i.1]</a>.
When "Thing" and "Datastream" entities are created the IPE is able to send "Observations" to the OGC/STA server as HTTP POST messages. The interested OGC/STA Client can now subscribe to the destination "Datastream" at the MQTT Broker of the OGC/STA server and thus getting every "Observation" forwarded from the IPE (see Figure 6.3.1.2-1). Alternativly the OGC/STA client MAY use a HTTP-GET request to pull the data when needed.
