How to collect video data from a DJI Tello drone and a UDP server in python?

Question

I have a DJI Tello drone and I would like to receive video data from it. I can connect my PC to the drone, send command on it via an UDP connection in python on the port '8889' but I don't know how to use the port '11111' to receive video data from the drone's camera.

I use a UDP connection between my drone and my PC in order to command this one (port 8889) and it works well: I can send command like 'command','takeoff' or 'land' and i receive 'OK'. But when I send 'streamon' to my tello I receive 'Unknow command' and nothing on the port '11111'.

import socket
import threading
import time


class Tello:
    def __init__(self):
        self.ip = '192.168.10.1'
        self.command_port = 8889
        self.address = (self.ip, self.command_port)
        self.response = None
        self.overtime = 3

        self.lock = threading.RLock()

        self.video_port = 11111

        self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.video_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

        self.socket.bind(('', self.command_port))

        # init command and video stream

        self.receive_thread = threading.Thread(target = self.receive_response)
        self.receive_thread.daemon = True


        self.socket.sendto(b'command', self.address)
        print('sent: command')
        last_send = time.time()

        self.receive_thread.start()

        while self.response != b'OK':
            if time.time() - last_send >= self.overtime:
                self.socket.sendto(b'command', self.address)
                print('sent: command')
                last_send = time.time()

        # video stream

        self.video_socket.bind(('', self.video_port))

        self.receive_video_thread = threading.Thread(target = self.receive_video_data)
        self.receive_video_thread.daemon = True
        self.receive_video_thread.start()

        self.socket.sendto(b'streamon', self.address)
        print('sent: streamon')



    def receive_response(self):
        while True:
            with self.lock:
                self.response, ip = self.socket.recvfrom(3000)
                if self.response:
                        print(str(self.response))

    def receive_video_data(self):
        self.video_data = None
        while True:
            with self.lock:
                data, ip = self.video_socket.recvfrom(2048)
                if data:
                    print(str(data))


    def send_command(self, command):
        self.socket.sendto(command.encode('utf-8'), self.address)

    #control command:

    def takeoff(self):
        self.send_command('takeoff')

    def land(self):
        self.send_command('land')


drone = Tello()

Answer 1

I got the answer: the firmware of my Tello wasn't updated so it didn't work. If you (like me) get 'Unknow Command!' after sending 'streamon' : Use your tello app and update your firmware in the settings.