Receive demand-response events as an OpenADR 2.0b Virtual End Node (VEN)

Steps

1. Deploy or configure an OpenADR 2.0b-compliant VEN client library (several open-source implementations exist in Python and Java); configure the VEN with its ven_id and registration details for the target Virtual Top Node (VTN).
2. Register the VEN with the VTN by sending an oadrCreatePartyRegistration request; the VTN responds with a registration ID and a polling interval for PULL mode clients.
3. In PULL mode, periodically send oadrRequestEvent to the VTN's EiEvent service endpoint to check for active or pending demand-response events; process any returned oadrDistributeEvent payloads.
4. Parse each oadrEvent for the event signals: extract eventID, dtstart (start time), duration, signal type (e.g., SIMPLE, PRICE), and signal payload value (e.g., 0=normal, 1=moderate, 2=high, 3=special).
5. Acknowledge receipt by sending oadrCreatedEvent with an optType of optIn or optOut, then execute the appropriate load curtailment or shift action based on the signal level.