C：UDP套接字编程

Question

I want to pass message between two devices, for an example devices are PCs. Currently I am using UDPServer.c and UDPClient.c for reference. By using this reference, I can pass messages, now I want to implement both side listen and send, also I want to create an API for sending message, that API can be used by other functions. May I need to use two different port for sending message and receiving message?? what is the best way to set up UDP socket programming for message passing??

Answer 1

From your description, it doesn't look like you need any more than what sendto() / recvfrom() already do. You might as well treat them as your "API" for message passing. Once you set up/open the socket, just send/recv as needed. You don't need to worry about different ports for sending/receiving; your example is fine. FYI, you can sendto/recvfrom on the same socket.