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Here is the original link that spawned this question.
So, apparently DataGramSocket will not queue received packets. So if two systems send concurrently, one of the packets will get lost (using the code from the link). I’m looking for ways to avoid dropping packets in this case.
There are queues but they are always limited and you can always reach the limit. There is no way to avoid such issue completely. You can minimise the impact by having a low load on your servers so it can drain the queues quickly, and a dedicated network for UDP traffic.
Generally you have to build in some allowance for lost packets and you have to make the protocol reliable.