I have been able to use the wake command just fine on a PC also get the little message at the bottom of screen to say command sent,

but not for my Mac Mini, no message saying command sent etc, 

i am able to wake mac with FING from app store.

 

have 3.7.1 installed on both

using my iphone iOS app

http://forum.pulseway.com/topic/414-wake-up-mac/