ProGuard rules file in the sample source for the BioMini SDK for Android. 
Since the detailed explanation of the ProGuard rules within the SDK is related to Xperix’s intellectual property, 
please refer to the provided file for more information

sample\biominisample\biomini_rules.pro

build.gradle
android {
buildTypes {
debug {
....
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'biomini_rules.pro'
}
release {
.....
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'biomini_rules.pro'
}
}