Python socket library: OSError: [WinError 10057] A request to send or receive data was disallowed because the socket is not connected

Question

OSError: [WinError 10057] A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied.

I am getting the above error..My server and client can send and receive their first messages but I get this error if I try to send more than one message.

My Server Code is here

import socket
import threading
import time
from tkinter import *


#functions
def t_recv():
    r = threading.Thread(target=recv)
    r.start()

def recv():
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as listensocket:
        port = 5354
        maxconnections = 9
        ip = socket.gethostbyname(socket.gethostname())
        print(ip)
        server = (ip, port)
        FORMAT = 'utf-8'

        listensocket.bind((server))
        listensocket.listen(maxconnections)
        (clientsocket, address) = listensocket.accept()
        msg = f'\[ALERT\] {address} has joined the chat.'
        lstbox.insert(0, msg)

    while True:
        sendermessage = clientsocket.recv(1024).decode(FORMAT)
        if not sendermessage == "":
            time.sleep(3)
            lstbox.insert(0, 'Client: ' +sendermessage)

def t_sendmsg():
    s = threading.Thread(target=sendmsg)
    s.start()

at = 0

def sendmsg():
    global at
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as g:
        hostname = 'Lenovo-PC'
        port = 5986

        if at==0:
            g.connect((hostname, port))
            msg = messagebox.get()
            lstbox.insert(0, 'You: ' +msg)
            g.send(msg.encode())
            at += 1

        else:
            msg = messagebox.get()
            lstbox.insert(0, 'You: ' +msg)
            g.send(msg.encode())      

And my client code is same with minor difference

import socket
import time
import threading
from tkinter import *

#functions
def t_recv():
    r = threading.Thread(target=recv)
    r.start()

def recv():
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as listensocket:
        port = 5986
        maxconnections = 9
        ip = socket.gethostname()
        print(ip)
        FORMAT = 'utf-8'
        host = 'MY_IP'    # My actual ip is there in the code

        listensocket.bind((host, port))
        listensocket.listen(maxconnections)
        (clientsocket, address) = listensocket.accept()


        while True:
            sendermessage = clientsocket.recv(1024).decode(FORMAT)
            if not sendermessage == "":                 
                time.sleep(3)                 
                lstbox.insert(0, 'Server: ' +sendermessage)

def t_sendmsg():
    s = threading.Thread(target=sendmsg)
    s.start()

at = 0

def sendmsg():
    global at
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as g:
        hostname = 'Lenovo-PC'
        port = 5354

        if at==0:
            g.connect((hostname, port))
            msg = messagebox.get()
            lstbox.insert(0, 'You: ' +msg)
            g.send(msg.encode())
            at += 1

        else:
            msg = messagebox.get()
            lstbox.insert(0, 'You: ' +msg)
            g.send(msg.encode())        

Please let me know what changes are required to be made in order to make it run for every message.

I tried to put

g.connect((hostname, port))

the above line in the loop so that it will connect every time loop iterates. But it did not help.

Answer 1

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as g:
    ...

    if at==0:
        g.connect((hostname, port))
        ...
        g.send(msg.encode())
        at += 1

    else:
        ...
        g.send(msg.encode())   

In the if at==0 condition it connects to the server, in the else part not. But is still trying to send something on the not connected socket.