wakaama | Eclipse Wakaama is a C implementation

IOTAgent:

• Automatically register new devices in Orion as part of the device provisioning procedure. This registration is used to forward queries/updates in the flows related with lazy attributes and commands.
• IOTAgent doesn't subscribe to Orion by default, only if bidirectional pluging is used. In that case the agent creates the subscription automatically.

Cygnus:

• It doesn't subscribe to Orion by default. Note that Cygnus doesn't know in advance which entities and attributes do you want to persist in its sinks, so it makes sense the user (who has that knowledge) create the subscription. Check this part of the Cygnus documentation about it.

You can check existing registrations and subscriptions in Context Broker using the following operations, respectively:

• GET /v2/registrations
• GET /v2/subscriptions

Note these operations are service aware and service path aware. Thus, you have to set the right fiware-service and fiware-servicepath HTTP request headers in order to get the rigth information. Have a look to the documentation on service and the documentation on service path related this.