# SDK

The Tello SDK connects to the aircraft through a Wi-Fi UDP port, allowing users to control the drone with text commands

## ARCHITECTURE

Use Wi-Fi to establish communication between Tello and PC, Mac or Mobile device

* Send Command & Receive Response
* Receive Tello State
* Receive Tello Video Stream

| Command                   | Description                                                                                                                                                                                                                                                          | Possible Response |
| ------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------- |
| command                   | entry SDK mode                                                                                                                                                                                                                                                       | ok / error        |
| takeoff                   | Tello auto takeoff                                                                                                                                                                                                                                                   | ok / error        |
| land                      | Tello auto land                                                                                                                                                                                                                                                      | ok / error        |
| streamon                  | Set video stream on                                                                                                                                                                                                                                                  | ok / error        |
| streamoff                 | Set video stream off                                                                                                                                                                                                                                                 | ok / error        |
| emergency                 | Stop all motors inmediately                                                                                                                                                                                                                                          | ok / error        |
| up x                      | Tello fly up with distance x cm (20-500)                                                                                                                                                                                                                             | ok / error        |
| down x                    | Tello fly down with distance x cm (20-500)                                                                                                                                                                                                                           | ok / error        |
| left x                    | Tello fly left with distance x cm (20-500)                                                                                                                                                                                                                           | ok / error        |
| right x                   | Tello fly right with distance x cm (20-500)                                                                                                                                                                                                                          | ok / error        |
| forward x                 | Tello fly forward with distance x cm (20-500)                                                                                                                                                                                                                        | ok / error        |
| back x                    | Tello fly back with distance x cm (20-500)                                                                                                                                                                                                                           | ok / error        |
| cw x                      | Tello rotate x degree clockwise x (1-3600)                                                                                                                                                                                                                           | ok / error        |
| ccww x                    | Tello rotate x degree counter-clockwise x (1-3600)                                                                                                                                                                                                                   | ok / error        |
| flip x                    | Tello fly flip x                                              l - left                                                         r - right                                                          f - forward                                               b - back | ok / error        |
| go x y z speed            | Tello fly to x y z in speed (cm/s) (xyz: 20 -500, speed: 10-500)                                                                                                                                                                                                     | ok / erro         |
| curve x1 y1x2 y2 z2 speed | Tello fly a curve defined by the current and two given coordinates with speed (cm/s) If the arc radius is not within the range of 0.5-10 meters, it responses false                                                                                                  | ok / error        |

For more details go to SDK Page

[https://dl-cdn.ryzerobotics.com/downloads/tello/20180910/Tello SDK Documentation EN\_1.3.pdf](https://dl-cdn.ryzerobotics.com/downloads/tello/20180910/Tello%20SDK%20Documentation%20EN_1.3.pdf)