UDP respond on connected socket?

I assume that functions you posted should be shared between client and server. They need to be slightly modified in order to achieve that. E.g.

On the server side recvudp should return client address (possibly as an out parameter) as it is needed later for sending message back to it. Furthermore, as client address structure is already filled (in recvudp on the server side or manually on the client side) we can just pass it to sendudp as its argument.

Make your sendudp function take a sockaddr_in. You get one back from recvfrom and can pass it to sendto. Alternatively, pass the received sockaddr_in to connect and use send from then on.

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