python - 无法读取UDP数据包

Question

关于与无人机通信的python脚本，我有一个小问题。我的程序运行正常，但是将命令“streamon”发送到无人机后，我应该会收到无人机的视频流。但是我什么都没得到。为了缩小问题的范围，我将代码发送给 friend ，以便他可以尝试。他可以接收视频，我用无人机在他的电脑上尝试了它，它也可以正常工作。所以我想问题出在我的电脑上。我尝试了一切，从更新python，从终端调试到在虚拟linux机器上尝试...。您知道问题可能是什么吗？
这是我的python脚本:

# Communication script with tello drone, connected via TELLO wifi network
​
print ('\r\n\r\nTello drone communication tool\r\n')
​
print("...importing modules...")
​
import threading 
import socket
import sys
import time
import platform  
import cv2
​
print("Modules imported")
​
print("...Initialiasing UDP server to get video stream....")
​
drone_videostream = cv2.VideoCapture('udp://@0.0.0.0:11111')
​
print("Server initialised")
​
# my local adress to receive UDP packets from tello DRONE
host = ''
port = 9000
locaddr = (host,port) 
​
print("...creation of UDP socket...")
# Create a UDP socket (UDP Portocol to receive and send UDP packets from/to drone)
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
​
# Got drone port and ip adress from network (explained in official SDK documentation)
tello_address = ('192.168.10.1', 8889)
​
print("UDP socket created")
​
​
sock.bind(locaddr)
​
width = 320
height = 240
​
​
def receiveStream() :
    print("...receiving stream...")
    
    while True :
        
​
        try :
            ret, frame = drone_videostream.read()
        except Exception :
            print(Exception)
        if ret : 
            cv2.imshow("LiveStream", frame)
        if cv2.waitKey(25) & 0xFF == ord('q') :
            break
            
​
    cap.release()
    cv2.destroyAllWindows()
        
   
def receiving():
    while True: 
        try:
            data, server = sock.recvfrom(1518)
            print(data.decode(encoding="utf-8"))
        except Exception:
            print ('\nExit . . .\n')
            break
​
receiveStreamThread = threading.Thread(target=receiveStream)
​
print ("...initialiazing connection with tello drone...")
​
message = "command"
message = message.encode(encoding="utf-8") 
sent = sock.sendto(message, tello_address)
​
​
​
print("Connection established")
​
#create a thread that will excute the receiving() function
receiveThread = threading.Thread(target=receiving)
receiveThread.start()

​
while True :
    message = input(str("Enter a command :\r\n"))
    if message == "streamon":
        message = message.encode(encoding="utf-8")         
        sent = sock.sendto(message, tello_address)
        receiveStreamThread.start()
​
    else :    
        message = message.encode(encoding="utf-8") 
        sent = sock.sendto(message, tello_address)

最好

Answer 1

在运行程序时，尝试运行wireshark。这样，您可以准确查看正在发送和接收的流量。您的 friend 可以做同样的事情，您可以比较输出以尝试找出失败的地方。
该问题可能是由您计算机的网络设置引起的。您是否正在运行阻止无人机流量的防火墙？