Hướng dẫn python socket recv hangs - python socket recv bị treo

I have implemented a socket server and client using python. Idea is to simply send an image from client to server and get back a text message from the server. The client will select an image file [.jpg] from file system and send to server. The server would receive it and save it with a different name [current date time stamp] and send back a processed text message. The image is sent and saved successfully at the server side but the issue is that client hangs when .recv[] method is called to get message from server.

Following is the code

Server

import socket
import datetime
import time
server = socket.socket[socket.AF_INET, socket.SOCK_STREAM]
server.bind[["127.0.0.1",12345]]
server.listen[]

print["Server started and listening at port 12345"]

BUFFER_SIZE=4096

while True:
    client_socket, address = server.accept[];
    # client_socket.setblocking[False]
    print[f"Connection from {address} has been established."]
    file_name = str[datetime.datetime.now[]].replace[" ", ""].replace[":", "-"]
    file_name = file_name + ".jpg"
    
    with open[file_name, "wb"] as file:
        recv_data = client_socket.recv[BUFFER_SIZE]
        while [recv_data]:
            file.write[recv_data]
            recv_data = client_socket.recv[BUFFER_SIZE]
    
    print["File writing done, preapring data to send..."]
    client_socket.send[bytes["Hey there!!!", "utf-8"]]
    client_socket.close[]

Client

import socket
import threading
client = socket.socket[socket.AF_INET, socket.SOCK_STREAM]
client.connect[["127.0.0.1", 12345]]

BUFFER_SIZE = 4096

with open["client_file.jpg", 'rb'] as file:
    file_data = file.read[BUFFER_SIZE]
    while [file_data]:
        client.send[file_data]
        file_data = file.read[BUFFER_SIZE]
msg = client.recv[1024] #