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In case of GPRS communication the solar system requires access to internet over GPRS by a non public APN (Access Point Name) service. This kind of service provides a non-changeable IP address for each SIM card which was installed on solar station and the supervisory system can always connect to specific station on this address and download necessary data.
Each solar station runs a TCP server on port 1234 and listens for connection from supervisory system.
As well as each solar station, supervisory system also requires access to internet and a constant IP address and it also runs a TCP server on port 1234 awaiting for notifications from solar stations.
In other words – supervisory system must be able to establish connection to every station on port 1234, and each of station must be able to establish connection to supervisory center on the same port.