Use an older example that does not rely on Android 6:

http://toastdroid.com/2014/09/22/android-bluetooth-low-energy-tutorial/


On Friday, October 14, 2016 at 2:21:10 PM UTC-6, Александр Сергеевич Джус 
wrote:
>
> 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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