The trick is that you need to subscribe!

There is a notifications channel (you will see it in the profiles in the supporting ino).

Once you get the UUID you can subscribe to it. Or any other characteristic.

BLE is pub sub  sorta

I have a 3.7v battery + tinyzero + imu + bluetooth. My code and everything works great with no battery or even with battery plugged in but hooked up to computer. Once i disconnect from computer, nothing. Tried (and ordered) several batteries. No dice. Charged. No dice.

Any ideas on power reqs? This setup should work off battery, right?