Script hangs when receiving data from socket

Question

This is my Python script to receive data from client:

import time
import socket

HOST = ''
PORT = 8888
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print('Socket created')

try:
    s.bind((HOST, PORT))
except socket.error as socketError:
    print('socket binding failed, ', socketError)
    print('Exiting...')
    sys.exit(0)

print('Socket binding complete')

s.listen(1)
print('Socket listening for connection...')

conn, addr = s.accept()

print('connected to ', addr[0])

bfr = b''
try:
    while True:
        while True:
            temp = conn.recv(1024)
            print('temp is ',temp.decode('utf-8'))
            print('buffer value ', bfr.decode('utf8'))
            if not temp:
                break
            bfr += temp;
        data = bfr.decode('utf-8')
        bfr = b''
        print('value received,', data)
        if data == 'Connection-Ready to receive commands':
            print('')
        #other conditions
except Exception as loopException:
    print("Exception occurred in loop, exiting...")
finally:
    s.close()

The script hangs up after printing connected to 192.168.4.197 and is not accepting any commands from client. if the client disconnects, all the send commands are printed.

Why is it behaving like this?

Update 1

Tried removing the inner while and added a time.sleep(.10) and the script is not hanging up but only the first command is printing as is and the rest is printing with a linebreak after the first character like, if I send 10, it will print 1 first and 0 in another line. All I want is to get the commands as it is sent from the client, every command is single word.

Your `try`/`except` suppresses every kind of exception. If you remove it, does it raise any errors? If so, please give a full traceback (though it may be obvious what's going wrong just from looking at it). — Blckknght, Apr 30 '19 at 21:39

score 0 · Answer 1 · answered Apr 30 '19 at 21:37

0

Perhaps try sendall to make sure the data is sent in its entirety from the client?

answered Apr 30 '19 at 21:37

jspcal

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the client is java – Sony Apr 30 '19 at 21:38
In that case make sure the client calls `flush` to flush each command. – jspcal Apr 30 '19 at 21:40
yes i have added flush after writing to output stream – Sony Apr 30 '19 at 21:44
tried adding delay with time.sleep(10) but it is only working only once – Sony Apr 30 '19 at 21:45

Script hangs when receiving data from socket

Update 1

1 Answers1