If you use telnet anyway you can write a test server that behaves like the hardware.

Depending on the emulated hardware it might be enough to dump the TCP streams with wireshark and emit them verbatimly in your test server. If that's not enough, you have to model the hardware, which is probably not a nice job.

In either case it helps to have good abstraction layer, so that you can provide a different backend to test applications that normally talk to your software.

In reply to Re: TDD when some components talk to hardware? by moritz
in thread TDD when some components talk to hardware? by lwicks

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