I recently started working on a java library for communicating with the Tello.
A listener for the video and state still needs to implemented but controlling the movement and receiving information works great.
Contributions are very welcome.
https://github.com/xrv0/JTello
I recently started developing one. You can check it out on my GitHub.
I still need to add a listener for the video and the Tello state(yaw, pitch etc.)
https://github.com/xrv0/JTello