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Editorial Team
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Asked: 2026-06-01T07:42:08+00:00

I’ve got UDPserver which recieves messages from clients and sends response to them. But

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I’ve got UDPserver which recieves messages from clients and sends response to them. But I need to check if UDPclients is online or not.
With isReachable I can test whether pc online or not. But when differents clients use same pc but with differents ports how to check whether port is open or not(Client1 with port 5678 is online but client2 6777 is off.IP 192.168.1.7 IP isReachable in this case but client2 is not)?

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1 Answer

  1. Editorial Team

    UDP is a connectionless, unreliable packet-oriented protocol. If there is no socket bound to a particular port on the remote machine then the packet will simply be dropped.

    You would have to implement some sort of protocol which supported detection of whether a client is online or not. Perhaps sending a keep-alive type message periodically.

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