I've built Tower with this version of dronekit-android and tested and it works fine. It fixes the RSSI missing data issue and I suspect a few other issues as well.
We could create a beta of this for testing purposes but I don't think we will get too many people building their own tower version with the beta. My preference would be to release this version and then create a beta of Tower with it.
Hmmm travis is failing saying we haven't accepted the license for Android SDK Build-Tools 24.0.1 which I don't understand as the travis.yml references 23.0.1 and the build.gradle file is the same. Ideas anyone?