Communicating with multiple clients using one TCP socket pyt

[sohcahtoa82 at gmail.com]

On Monday, March 30, 2015 at 1:44:17 AM UTC-7, bobbdeep wrote:
> I am using TCP sockets to communicate between my server and clients. The server code and socket code are as below:
> 
> server:
> 
> from socket import *
> 
> HOST = 'xx.xx.xx.xx'
> PORT = 1999
> serversocket = socket(AF_INET,SOCK_STREAM)
> serversocket.bind((HOST,PORT))
> print 'bind success'
> serversocket.listen(5)
> print 'listening'
> while True:
>     (clientsocket, address) = serversocket.accept()
>     print ("Got client request from",address)
>     #clientsocket.send('True')
>     data = clientsocket.recv(1024)
>     print data
>     clientsocket.send('True')
>     clientsocket.close()
> 
> 
> client:
> 
> import socket
> import sys
> 
> # Create a TCP/IP socket
> sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
> 
> # Connect the socket to the port on the server given by the caller
> server_address = ('xx.xx.xx.xx', 1999)
> print >>sys.stderr, 'connecting to %s port %s' % server_address
> sock.connect(server_address)
> 
> try:
> 
>     message = 'This is the message.  It will be repeated.'
>     print >>sys.stderr, 'sending' 
>     for x in range (0,1):
>       name=raw_input ('what is ur name')
>       print type(name)
>       sock.send(name)
>       print sock.recv(1024)
> 
> finally:
>     sock.close()
> 
> 
> I am able to communicate with the server from client and able to send and receive data. But the problem I am facing is that I am not able to send and receive data continuously from the server. I have to restart my client code on my laptop to send and receive data again from the server. The way the above client code is working is that when I give a keyboard input, then the socket sends data to server and server responds back. But in the client code, in the for loop if I do two iterations, for the second iteration the data I enter from keyboard is not reaching server. I need to restart my client code to send data again. How do I fix this ?
> 
> Also, when once client is connected to the server, the other cannot connect to the server. Any ideas on how to do this ?

You have a bug here:

    for x in range(0, 1):

range(0, 1) returns simply [0].  It is only going to loop once.  If you want it to loop twice, just use range(2).

Also, your server is immediately closing the connection after the first packet of data.

    data = clientsocket.recv(1024) 
    print data 
    clientsocket.send('True') 
    clientsocket.close() 

Your server receives the first send from the client, prints it, sends back a 'True', then closes the connection.