Please let me confirm. Is it correct as following ?
If I must use private IPv4 address for connecting RUT240, and to control digital output on RUT240,
1. WebUI Link does not reach to RUT240
2. JSON-RPC does not reach to RUT240
3. MQTT client does not support controlling digital output
4. RMS does not support connecting to customer VPN. So, WebUI/JSON-RPC over VPN is not available
5. RMS API reaches to RUT240, but RMS API does not support controlling digital output on RUT240
So, in this condition, I am required to develop custom application in RUT240.