Geoff,
Bummer. I seem to recall someone else recently posting a similar issue with their Moto G, but the meter would work ok with another android device. Is that an option for you? By the way, I don’t even have the app installed on my good cell phone. I bought a few really cheap ($20 or less) pre-paid phones to dedicate to projects like this. Any carrier is ok since I never activate the phone, so there is no recurring costs. Just connect to the internet via wifi. I got one new android 4.4 phone on sale at my local supermarket (in the USA) for $10. Works great and doesn’t tie up my “real” phone.
—- Duane