Have been away for a week and this morning tried to connect to the Shark Robot vacuum cleaner but the app could not communicate with the Shark cleaner, even after I restarted my iPhone.
Eventually had to power Off and then back On the shark robot cleaner which then allowed the app to communicate with the robot cleaner.
I could not see in the literature, but they might be a sleep mode which may account for the communication problem between iPhone app and Shark robot cleaner, will have to Google that later and double check 
Shark PowerDetect Robot Vacuum Cleaner is now busy cleaning downstairs whilst I have another Coffee 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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