What are the ways to send commands from the client to the server(s)?

Question

Computer networks

How convenient it is to send commands from the client to the server. The server is in C, the commands would like the format "command parameter1 parameter2 parameterN" and / or "command structure1" I just can't figure out how to make a command handler with a good interface. And how do they synchronize the client and server code if, for example, any structure has changed, well, except for not forgetting to update the code on the other side (for example, the server is in C and the client is in python)