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A simulator would give you exactly the bytes you need to send from a Java control application - that would be the immediate benefit. You could save them as a list of commands and 'replay' them with...

I doubt your difficulties lie with TCP. If your first two commands work, you probably ought to concede that the problem lies with your third command. How else can you tackle this? Can you simulate...

It could be something more trivial, like a kludgey 'security' feature on the equipment that restricts communication to a specified IP address, or something in the protocol that's sensitive to the...

I doubt packet inspection will help much for a Java solution - there's not much you could do with that level of detail from within Java. If it's a very simple text protocol as you say, have you tried...

GET OFF MY ... nvm

Can you run the DOS client in something like VirtualBox to act as a proxy? Or how about a GPIB proxy - a PC with a GPIB card (amazon has to-USB cables for not small amounts of...