Funny story, the advanced settings didn't work in release builds as some...

Funny story, the advanced settings didn't work in release builds as some classes were missing in the release version (without ever crashing - smells like reflection). Somehow (even with minify enabled) this slipped trough in development.

app/proguard-rules.pro

@@ -19,7 +19,6 @@
 -dontnote org.xbill.DNS.spi.DNSJavaNameServiceDescriptor
 -dontwarn org.xbill.DNS.spi.DNSJavaNameServiceDescriptor
 -dontwarn java.awt.*
--dontwarn org.slf4j.*
 
 # See http://stackoverflow.com/questions/5701126, happens in dnsjava
 -optimizations !code/allocation/variable
@@ -30,4 +29,16 @@
     *;
 }
 -renamesourcefileattribute SourceFile
--keepattributes SourceFile,LineNumberTable
\ No newline at end of file
+-keepattributes SourceFile,LineNumberTable
+
+-dontwarn org.slf4j.impl.*
+-keep class org.slf4j.** {
+    *;
+}
+-keep class org.pcap4j.** {
+    *;
+}
+-assumenosideeffects class org.slf4j.Logger {
+    public void debug(...);
+    public void trace(...);
+}
\ No newline at end of file