The iRule system uses the Global Cache converters and will give you two-way RS232 control over IP. They have a highly customizable iOS GUI and all the Meridian codes in their database. They have been around for at least three or four years.

I am still using my Pronto TSU2000 which I have had for over a decade. It works fine for my relatively simple setup, but if I wanted to make the switch to something slicker it would be iRule. Of course, then I'd have to spring for another iPad.

561, DSP5500s, DSP5000C, analog sides and rears