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Communication between two computers using python socket

I use these two programs to communicate between my two computers, which I enter, and I do not return anything from each side. It just starts without sending

customer

import sys
from socket import socket, AF_INET, SOCK_DGRAM

SERVER_IP   = '127.0.0.1'
PORT_NUMBER = 5000
SIZE = 1024
print ("Test client sending packets to IP {0}, via port {1}\n".format(SERVER_IP, PORT_NUMBER))

mySocket = socket( AF_INET, SOCK_DGRAM )

while True:
        mySocket.sendto('cool',(SERVER_IP,PORT_NUMBER))
sys.exit()

Server

from socket import socket, gethostbyname, AF_INET, SOCK_DGRAM
import sys
PORT_NUMBER = 5000
SIZE = 1024

hostName = gethostbyname( '0.0.0.0' )

mySocket = socket( AF_INET, SOCK_DGRAM )
mySocket.bind( (hostName, PORT_NUMBER) )

print ("Test server listening on port {0}\n".format(PORT_NUMBER))

while True:
        (data,addr) = mySocket.recvfrom(SIZE)
        print data
sys.ext()

What can i do wrong?

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5 answers

The problem is your client address:

SERVER_IP   = '127.0.0.1'

You connect to the local machine and send data, while your server is sitting on a different ip. You need to connect to ip or hostname servers.

You can verify this by first connecting to the client (and crashing if it doesn't fit)

...

import time

mySocket = socket( AF_INET, SOCK_DGRAM )
mySocket.connect((SERVER_IP,PORT_NUMBER))

while True:
        mySocket.send('cool')
        time.sleep(.5)

Update from comments

Wi-Fi, , . IP- LAN , .

IP

  • OSX/Linux: ifconfig
  • Windows: ipconfig /all
+8

SERVER_IP , , UDP 5000.

Linux-, iptables -L . iptables -F (!) , , . .

0

IP- LAN : 192.168.1.102, WiFi. , Windows ipconfig:

C:\Users\jackc>ipconfig

Windows IP Configuration

Wireless LAN adapter Wireless Network Connection 3:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . :
   Link-local IPv6 Address . . . . . : fe80::ed97:91a4:9449:204b%13
   IPv4 Address. . . . . . . . . . . : 192.168.8.106
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.8.1

, .

:

#!/usr/bin/env python3

import sys
from socket import socket, AF_INET, SOCK_DGRAM

SERVER_IP   = '192.168.8.102'
PORT_NUMBER = 5000
SIZE = 1024
print ("Test client sending packets to IP {0}, via port {1}\n".format(SERVER_IP, PORT_NUMBER))

mySocket = socket( AF_INET, SOCK_DGRAM )
myMessage = "Hello!"
myMessage1 = ""
i = 0
while i < 10:
    mySocket.sendto(myMessage.encode('utf-8'),(SERVER_IP,PORT_NUMBER))
    i = i + 1

mySocket.sendto(myMessage1.encode('utf-8'),(SERVER_IP,PORT_NUMBER))

sys.exit()

:

#!/usr/bin/env python3

from socket import socket, gethostbyname, AF_INET, SOCK_DGRAM
import sys
PORT_NUMBER = 5000
SIZE = 1024

hostName = gethostbyname( '0.0.0.0' )

mySocket = socket( AF_INET, SOCK_DGRAM )
mySocket.bind( (hostName, PORT_NUMBER) )

print ("Test server listening on port {0}\n".format(PORT_NUMBER))

while True:
    (data,addr) = mySocket.recvfrom(SIZE)
    print data
sys.exit()
0

, socket.gethostname() , ""

: socket.gethostname() .

s.bind(('localhost', 80)) 


s.bind(('127.0.0.1', 80))

"" , , . s.bind(('', 80)) , , .

0

" " " "

import socket

def Main():

    host = '192.168.0.12' #Server ip
    port = 4000

    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    s.bind((host, port))

    print("Server Started")
    while True:
        data, addr = s.recvfrom(1024)
        data = data.decode('utf-8')
        print("Message from: " + str(addr))
        print("From connected user: " + data)
        data = data.upper()
        print("Sending: " + data)
        s.sendto(data.encode('utf-8'), addr)
    c.close()

if __name__=='__main__':
    Main()


import socket

def Main():

    host='192.168.0.13' #client ip
    port = 4005

    server = ('192.168.0.12', 4000)

    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    s.bind((host,port))

    message = input("-> ")
    while message !='q':
        s.sendto(message.encode('utf-8'), server)
        data, addr = s.recvfrom(1024)
        data = data.decode('utf-8')
        print("Received from server: " + data)
        message = input("-> ")
    s.close()

if __name__=='__main__':
    Main()
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