Hi James
I've been asked this question a lot lately, and the answer I have to give makes me cringe, because if there were just simply a USB port in iOS, support would be an easy thing to add.
Sorry, - nothing is in the works at the moment, for that reason. I am, however, going to reach out to Hottop directly, to see exactly how their protocol works to look at the possibility of intercepting the signal with another device (Phidgets, Arduino, etc).
I'd love to offer support if possible with iOS' limitations.
I'll let you know what I find out.