Configure Generac Grid Services Concerto DERMS to dispatch a battery fleet via OpenADR 2.0b and receive telemetry via REST

Steps

1. Register the VEN (Virtual End Node) in Concerto's administration interface; obtain the VTN URL, VEN ID, and registration ID from the Concerto platform configuration
2. Implement the OpenADR 2.0b VEN using mutual TLS; send an oadrCreatePartyRegistration request to the VTN, confirm with oadrCreatedPartyRegistration containing the registrationID
3. Subscribe to EiEvent signals: poll the VTN's oadrRequestEvent endpoint or configure push delivery; parse the EiEventSignal for signalType LOAD_DISPATCH with payload units in kW
4. Apply the dispatch command to the battery fleet management system; send oadrCreatedEvent with eventResponses status OPTED_IN within the dtstart window
5. Configure the REST telemetry push: register a webhook URL in Concerto's integration settings to receive per-device state-of-charge, active power (kW), and availability payloads in JSON
6. Validate end-to-end by triggering a test event in the Concerto UI and confirming the VEN acknowledges and the webhook receives a telemetry payload within 60 seconds