tello-wrapper

A small Java library that connects your JVM to your tello drone. Provides access to tello sdk commands, state messages and video feed. Based on Tello4J.

Getting started

Include the library in your project by adding it as a gradle source dependency:

build.gradle:

repositories {
    jcenter()
}

dependencies {
    implementation 'com.github.ele115:tello-wrapper:2.+'
}

Use the API to send instructions to your drone, receive state updates and video frames from the camera of your drone:

import com.github.ele115.tello_wrapper.ITelloDrone;
import com.github.ele115.tello_wrapper.Tello;
import com.github.ele115.tello_wrapper.tello4j.api.video.VideoWindow;
import com.github.ele115.tello_wrapper.tello4j.api.world.FlipDirection;

public class FlightPlanExample {
    public static void main(String[] args) {
        // Connect to an actual drone, or a simulated drone:
        ITelloDrone drone = Tello.Connect("59D70D");
        //                = Tello.Connect("simulator");
        // Subscribe to state updates of our drone (e.g. current speed, attitude)
        drone.addStateListener((o, n) -> {
            // Do sth. when switching from one to another state
        });
        //Create a video window to see things with our drones eyes
        drone.addVideoListener(new VideoWindow());
        // ...or use a custom video listener to process the single frames
        drone.addVideoListener(frame -> {
            //Do sth when we received a frame
        });
        // ...and tell the drone to turn on the stream
        drone.setStreaming(true);
        // Now perform a flight plan
        drone.takeoff();
        drone.forward(30);
        drone.turnLeft(90);
        drone.forward(30);
        drone.backward(30);
        drone.flip(FlipDirection.FORWARD);
        drone.turnRight(90);
        drone.backward(30);
        drone.land();
    }
}

Documentation

Refer to the javadoc of Tello4J.

Legal

Apache-2.0

Changes from Tello4J:

• Added wrapper to get away throws
• Added simulator
• Integrated mac-to-ip
• Robust transmission
• Ping to prevent 15-second auto-landing

Development

The package is published to JFrog Bintray/ELE115/maven/tello-wrapper. To make a new release:

1. Create a new account on JFrog Bintray.

2. Obtain your API key.

3. In file ~/.gradle/gradle.properties, add two lines:

   bintray.user=<your-bintray-user-name>
   bintray.key=<your-bintray-API-key>
   

4. Ask the admin of the JFrog Bintray/ELE115 to include you as a member.

5. Double check if the version in build.gradle is correct.

6. Run ./gradlew bintrayUpload.