Connect Ensto Smart to HA

Hello!

I’m pretty newbie with Home Assistant. But i’m impressed off how easy it’s to setup up Home Assistant and all that potential there is. A big help is the documentation.

I wanted to integrate a Ensto smart home automation system to Home Assistant.

My Ensto Smart uses a 2G cellular modem to communicate with the world. I can send text message to ask states, temperatures and so on to Ensto Smart and it answer me with an text message. The modem is connected with a RS232 serial connection and it use simple AT commands.

My Home Assistant is running in Hass.io on a Raspberry Pi 3.

If some one could give me some advice on how it could be done.