Use an older example that does not rely on Android 6:
On Friday, October 14, 2016 at 2:21:10 PM UTC-6, Александр Сергеевич Джус
> Hello, I want to use Bluetooth 4.0 to connect the Vert device. The problem
> is,that I have android 4.4, but your official example is based on android
> 6.0. I rebuilded this example to work on my device, it starts with
> problems (I can connect and get BleService(s)/BleCharacteristic(s), but
> haracteristic.getValue("...") always null ). So can you say what is wrong,
> and what should I do to get Vert's values ?
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