You can uses pipes too, basically just two files no need of networking,
one for reading (delphi to freepascal), one for writing(freepascal to
delphi).
I made last year a small app to communicate with Audacity
(https://www.audacityteam.org/) using a specific plugin
(https://manual.audacityteam.org/man/scripting.html).
You can find there the unit/class which manages the communication:
https://github.com/jsuzineau/pascal_o_r_mapping/blob/TjsDataContexte/tools/jsAudacity/uAudacity.pas
In my case I used pipes already created by Audacity.
For your problem I think it would be more appropriate to use FpPipe
(although I personnaly never used it):
https://www.freepascal.org/docs-html/rtl/baseunix/fppipe.html
I think you will find something similar on Delphi 7 side.
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