The multicast sniffer application allows you to listen on the udp multicast socket on your local network. For example, to debug your Xiaomi smart home. It doesn't work on the internet because udp multicast sockets don't work on the internet. It can also be used as a local chat. Just start listening on the IP address and port, and all users listening on that address will see your messages. It doesn't matter if your local network doesn't have this IP address.
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