On reverse engineering an udp protocol to control a drone

My goal is to control my drone with my raspberry pi using python and not the app that is being delivered together with it.

First I connected the app to the drone, flew and used aircrack-ng to get the pcap.

I looked at it in wireshark and could not make sense of it.

I presume it to be unencrypted UDP though.

So I decompiled the java apk with APK Studio and looked at the source code.

I looked for a random button in an xml to find the corresponding method in a java file.

It did not exist.

There are some smali files.

Which approach do you suggest for reverse engineering it?