This information is provided by the pok_ports_names declaration. It contains the name of each local port.
There is an example of a such declaration.
char* pok_ports_names[POK_CONFIG_NB_PORTS] = {"node1_partition_secret_outgoing", "node1_partition_topsecret_outgoing", "node1_partition_unclassified_outgoing"};
When you use code generation, this declaration is automatically created in the deployment.c file.