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One program I've used in the past is WireShark, but generally I prefer to use the "standard" Java debug tools, i.e. Eclipse, Netbeans, whatever you use for debugging Java programs. I check the data...

What problems are you running into? I tested it and it works fine for me. Make sure you start the server before trying to run the client.

I've typically found testing using localhost is the...

If you're just doing some testing, use your localhost address: 127.0.0.1. This way you can safely create server/client connections on just your machine.

If you want to connect to another device,...