How to Write a data retrieval function: send a command to the server for TCP/IP communication and obtain the returned data from the server.

I want to write a function getdataformserevr (command: string): string;
The function implements the following: send a command to the server through TCP/IP communication, and obtain the returned data from the server as the function value.
How can I handle the problem of waiting for data to return?
How can I solve the timeout problem?
Hope experts can provide answers.

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