Creating a .jar file

I am creating a Cordova plugin.  I saw the work here by LSDeluca and that has provided good guidance.  My challenge is creating a .jar file for /src that has just the classes my app needs.  I looked at the content of the last released .jar (2.8.8) it looks like it is created from "MetaWear-SDK-Android/library/src/main/java/com/mbientlab/metawear/" but it also included MetaWearBleService classes and a BuildConfig.class.  So:  a) have I correctly identified how a useful .jar would be created and b) Where do the latter classes come from?  Or is there a .jar for the latest release.  TIA for any guidance or assistance.


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