UDP socket programming Series 1

I recently used socket for network programming and recorded a bit of experience:

UDP socket communication is divided into server and client. If data cannot be communicated, consider the following two aspects:

1. Check whether the IP address of the transceiver is configured properly.

2. Check whether the sending and receiving ports match. That is to say, whether the sending port to the data is the port listened by the receiving end

If the data received by the receiving end is garbled and inconsistent with the data sent by the sending end, it is likely that the buffer of the receiving end has no allocation space.