Socket access interrupts, how to implement?

Question

Socket.io

Hello, I am writing a sea battle lab.
According to T.Z. from the teacher to transfer information, I can only use the socket. Accordingly, to receive information, I can use only this line . When this line is called, it hangs until the message on the socket passes. How can I make it run in parallel or only be called when the information passes? recv(Connection, msg, sizeof(msg), NULL);

I asked the teacher about threads and he said that they cannot be used, but timer1_Tick can be used. I tried to stupidly hang this command there, but everything hangs again.

Help me please.