Connection without internet

As a "blue bird, I will go to the sud for the bad season…
During this period, because internet is costly, we suspend the connection.
So no more supervision to the house.
I will develop an application to exchange data to the local network of the house by the way of an gateway with an SIM card to have an internet connection as demand.
From the external, I want to send a message to the gateway (may be an SMS ?) to tell the gateway to send me a resume of the house status.
Is somebody working in the same way ?

Best regards