Hello,
You mention that you currently use Modbus to send data to your Scada system. Do you use data to server functionality for this? If so, are you sending this data over HTTP or MQTT?
Is it absolutely necessary for you to use DNP3 in this case? Perhaps Modbus Alarms here would achieve your requirement? With Modbus alarms, you can monitor Modbus register values on the Modbus Server. For example, if the Modbus register value on the Modbus server changes, you can send an SMS or an MQTT message. With some workarounds, it should be possible for Modbus Alarms to trigger data to server to send data to your system as well. You can take a look here as well.
Kind Regards,