OpenCV simple tcp server

cv_tcp_server.py

import socket
import cv2
import numpy as np
import struct

HOST = '127.0.0.1'
PORT = 5005

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))
s.listen(10)
print('Socket now listening')

conn, addr = s.accept()

while True:
    header = conn.recv( struct.calcsize("!I") )
    img_len = struct.unpack("!I", header)[0]
    print (img_len)
    data = ''
    e=0
    while e < img_len:
        d = conn.recv(1024)
        e += len(d)
        data += d
    
    img = np.fromstring(data, dtype='uint8')
    decimg=cv2.imdecode(img,1)
    cv2.imshow('SERVER',decimg)
    cv2.waitKey(1)
    

s.close()
cv2.destroyAllWindows()