KC868-A4 remote control over the Internet.

[kramm]

Hello.

I want to use the KC868-A4 for manual remote control of the boiler from an Android device.
Inputs A3 and A4 and outputs DA1 and DA2 are for power conveyor and exhaust fan control.
Inputs A1 and A2 are for temperature sensors. A DS18b20 sensor is also used for temperature control.
Digital inputs and relay outputs are for switching water pumps.

It is better to use port forwarding, VPN or DMZ than a cloud service to connect to the Internet.

I would like help in creating a program.