Help Is waiting for UDP packets
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about UDP (Network Server)

Discard mode discards older packets and keeps the newest packet only.

FAQ

When server socket is set to enqueue theres a delay of about half a second before data sent on the other computer arrives in vvvv. In concatenate mode there is no delay, but the string length changes in a strange way.

Your sending computer sends data packets faster as the receiving computer can process them.
In enqueue mode the receiver will read exactly one message each frame. all other messages are queued up, and are delivered later. No message ever gets discarded.
Try reducing the amount of messages sent or increase the framerate of the receiver. The socket components are quite fast, so the delay you´re experiencing is most likely a matter of the receiving queue filling up.
In concatenate mode all messages received during one frame are appended to one long string. The length depends on the number of messages received. You can then use the tokenizer, split or regexpr node to split this long string into a spread of the individual messages and process them all during one frame. With this method you have the flexibility of using whatever behaviour you like (sorting them into different channels, averaging them, taking the maximum, ignoring them etc.)