Standard-java TCP host and client with javafx in src/protocol,
javac -d bin src/protocol/*.java will compile them in bin/, so
java -cp bin protocol.Host will host, ~.Client will peer.
Android client is under src/main/.
wget https://dl.google.com/android/repository/sdk-tools-linux-3859397.zip && unzip sdk-tools-linux-3859397.zip && export ANDROID_HOME=$(pwd)/tools for android sdk,
then install modules with sh tools/bin/sdkmanager "build-tools;26.0.1" "platform-tools"
gradle -b build.gradle build for local gradle compiling,
gradle wrapper && sh ./gradlew build for remote (dumps in build/), or
mvn package for maven compiling with pom.xml (dumps in target/).