I don't know how to make a sever on esp32
The WiFi library in the ESP package includes a server example.
and let all the wemoses use it there is
That will involve programming the wemoses to connect to your server and make GET requests. As you don't have a server yet, and haven't said what it will be capable of, or what the clients are to actually do, you can't expect much help with the programming.
You really should forget about the number 16. At any given time, the server will be dealing with 0 or 1 client. What the hardware allows is for up to 16 clients to connect at the same time. The hardware manages the queue of clients. You only need to detect that there is a client connected, and to process that client.