I assumed this combination would work. However, SkySafari 5 Plus on Android complains: "SkySafari Plus can make a wireless connection to the scope, but the scope is not responding. Make sure the scope is powered on and connected correctly. Also make sure you selected the correct scope type."
It is indeed powered on and connected correctly (not sure how it can make a wireless connection to the scope, if that were not the case).
I selected scope type: "iOptron SmartEQ/ZEQ & 8407/8" and mount type: "Equatorial GoTo (German)"
Tablet and SkyBT are only a couple of feet apart.