User Datagram Protocol or UDP for short is very simple connectionless protocol that can be used to transfer datagram packets in both the direction. Client can send the datagram packets to server and it can also receive the reply from server. UDP does not provide the reliability nor ordering guarantees that TCP does.
You can also develop the UPD server in Java that can process the data received on a particular port. This type of application is very useful in getting the data using UDP protocol. With the help of these tutorials you should be able to develop your own application in Java.
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