Just build something then:
$ adb root && adb remount && adb sync
Download screencast .jar executable: https://github.com/xSAVIKx/AndroidScreencast/releases/download/v0.0.16s/androidscreencast-0.0.16s-executable.jar
Connect board through adb:
$ adb connect board-ip
Then from the host run screencast:
$ java -jar androidscreencast-0.0.16s-executable.jar
References: https://github.com/xSAVIKx/AndroidScreencast/releases