In my setup, I have a bluetooth interface between my arduino and my laptop.
I roast in my backyard, so I can now sit in my kitchen, and run the roaster outside.
But, bluetooth (at least my setup) has a limited range, so I decided to add a wifi interface from my PC to my iphone.
Now, I can monitor a roast from my iphone, via wifi.
All I needed extra was a $5 all, touchOSC.
BTW, they have touchOSC for android too.
Randy