IPhone App Approval With Wireless Communication To External Hardware

I am working on an application that communicates via TCP/IP with an external device that controls a large piece of machinery. How would I submit this to apple?

Do you think apple must test the ha开发者_开发技巧rdware and machinery as well?

Can I create a demo login that acts as though it is controlling a device without any wireless communication?

IIRC, someone else created a demo login to control some sort of online simulation of the expensive hardware, and got their app approved.