Android Bluetooth stack and Low Energy
From Variscite Wiki
Android Bluetooth Stack
We recommend you go through https://developer.android.com/guide/topics/connectivity/bluetooth-le to understand the software stack.
For more details: https://www.youtube.com/watch?v=2fZThdNbHcQ
VAR-SOM-MX6, DART-MX6 and VAR-SOM-SOLO/Dual are capable of supporting BLE 4.0.
Paring Device
Make sure your device you want to pair is discoverable
Turn on the Bluetooth from the Android Settings
Make sure you can see your device(s) in the discovered list
Click on the device and click on pair
The prompt may ask you to enter the PIN, or may try with default pin 0000/1111
Note: For pin, you must refer to the device manual trying to connect.