SDS-2025-0016R02-ogc_ipe_configuration_aspects
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Ingo Friese authored
@@ -185,7 +185,46 @@ The IPE shall map the 'result' attribute of an OGC/STA 'Observation' to the 'con
To enable interworking, preparation is required for both the oneM2M-CSE and the OGC/STA server (see Figure 6.3.0-1). As described in Section 6.0, the IPE maps data from an OGC/STA "Observation" to a oneM2M `<contentInstance>` and vice versa. This specification defines a 1-to-1 relationship in each direction between the "Datastream" associated with the "Observation" and the `<container>` associated with the `<contentInstance>`. An IPE may implement multiple 1-to-1 relationships.
An "Observation" according to STA Sensing Entities Data Model <a href="#_ref_i.1">[i.1]</a> belongs to a "Datastream" (see Figure 5-2). The IPE shall subscribe to the "Datastream" containing the observations to be forwarded to the oneM2M side at the MQTT broker of the OGC/STA server using its specific URL or topic, e.g., {sta-example-server-address.com/v1.0/Datastreams(8715)}. Upon successful subscription, the IPE will receive every "Observation" pushed to that "Datastream".
When a "Datastream" is created on the OGC/STA server, a reference ID (e.g. {"@iot.id:3635353"}) is returned. This reference is required by the IPE to associate an "Observation" with a "Datastream" and shall be available during IPE operation. In addition to the "Datastream" other entities of the STA Sensing Entities Data Model <a href="#_ref_i.1">[i.1]</a>, such as "Location" or "Sensor," may be created.
The creation of entities like "Datastream" and "Thing" requires several mandatory properties that shall be known at configuration time (e.g., 'name' and 'description'). These property fields may be automatically derived, for example, from the "Label" or "ResourceName" attributes of the corresponding oneM2M `<container>` resource or if existing, from the corresponding `<AE>` resource during IPE configuration. The OGC/STA procedures for creating OGC entities are described in SensorThing API documentation <a href="#_ref_i.1">[i.1]</a>.
Once the destination-"Datastream" is created, the IPE can send an "Observation" to the OGC/STA server as HTTP POST message. An interested OGC/STA client can subscribe to the destination-"Datastream" at the MQTT Broker of the OGC/STA server to receive each "Observation" forwarded by the IPE (see Figure 6.3.1.2-1). Alternatively, the OGC/STA client may use an HTTP-GET request to retrieve the data as needed.