Implement DNP3 outstation communications between a utility SCADA master and a DER aggregator gateway to deliver dispatch setpoints and receive telemetry

Verified steps

1. Configure the DER aggregator gateway as a DNP3 outstation using Group 30 Var 5 (32-bit float Analog Input) for real-time power telemetry points: assign point index 0 to active power (kW), index 1 to reactive power (kVAR), index 2 to state of charge (% for storage)
2. Map dispatch setpoints to Group 41 Var 3 (32-bit float Analog Output) write points; define index 0 as active power setpoint (kW) and index 1 as reactive power setpoint (kVAR) per the DNP3 Data Object Library
3. Configure unsolicited reporting (Class 1, 2, 3 events) on the outstation for changed-value telemetry to minimize polling overhead; set deadband values per telemetry requirements (typically 1% of rated capacity for power and 0.5% for voltage)
4. Implement Binary Output Group 12 Var 1 (Control Relay Output Block) for discrete commands: index 0 = DER enable/disable, confirm CROB operation code LATCH_ON / LATCH_OFF
5. Configure DNP3 Secure Authentication Version 5 (SAv5) per IEEE Std 1815-2012 Annex A for production deployments; exchange Update Keys with the SCADA master using the Challenge-Reply mechanism
6. Test end-to-end by triggering a setpoint write from the SCADA master and verifying the outstation reports back the applied setpoint via the corresponding Analog Input point with an event timestamp accurate to ±1 ms (DNP3 Time Sync required)