How to find out if two verilog modules are connected using VPI PLI - Verilog VCS

module A (
    output A_OPORT_1 
    ); 
endmodule

module B (
    input B_IPORT_1
    ); 
endmodule

module TestBench;
wire A_to_B; 
A A_inst (
        .A_OPORT_1  (A_to_B)
        );
B B_inst (
        .B_IPORT_1  (A_to_B)
        );

endmodule

Here basically the output port A: A_inst: A_OPORT_1 is connected to B: B_inst: B_IPORT_1

How can I get this information using PLI verilog? An example is being evaluated.

I have a code that receives a port and retrieves highconn and can receive A_to_B wire / network.

However, I cannot find out which ports are connected to A_To_B using vpiPortInst. I get an iterator that is null.

    vpiHandle high = vpi_handle(vpiHighConn, port); 
        vpi_printf(" High conndata type is %s\n",
            vpi_get_str(vpiType, high));
        vpi_printf(" High conndata Net type is %s\n",
            vpi_get_str(vpiNetType, high));                    
        vpi_printf(" High conndata Name is %s\n",
            vpi_get_str(vpiFullName, high));     

        vpiHandle iter = vpi_iterate(vpiPortInst,high);
        vpiHandle p2ref;
        if (iter == NULL)
        {
            vpi_printf(" Port Iterator is null\n");                      
        }

O / P:

 High conndata type is vpiNet
 High conndata Net type is vpiWire
 High conndata Name is $unit::A_to_B
 Port Iterator is null