Telnet risponse only "18" after silence

[costycnc]

I have a w600-pico with micropython preinstalled. I create a socket and can send receive commands over socket.
This is program:

import socket

s = socket.socket()
s.bind(('', 23))
s.listen(5)

while True:
conn, addr = s.accept()
request = conn.recv(1024)
print(request)

And when connect with lasergrbl the response is only 18 ... so... ican read only 18 ...after this ... nothing ... how see bellow:

__            __                                                            
\ \    /\    / /                                                            
 \ \  /  \  / /                                                             
  \ \/ /\ \/ /                                                              
   \  /  \  /                                                               
   / /\  / /\                                                               
  / /\ \/ /\ \                                                              
 / /  \  /  \ \                                                             
/_/    \/    \_\                                                            

Connected to TIM-32883215
ftpserver is running.
URL: 192.168.1.9:21 username: "user", password:"12345678"
192.168.1.9
b'\x18'

But in comlog.txt appear many "?" 3F how see bellow:

00465 06125563 com Open 192.168.1.9:23 Ctrl-X
00466 06125629 tx [18]
00467 06125631 tx [3F]
00468 06125882 tx [3F]
00469 06126132 tx [3F]
00470 06126383 tx [3F]
00471 06126632 tx [3F]
00472 06126883 tx [3F]
00473 06127132 tx [3F]
00474 06127382 tx [3F]
00475 06127632 tx [3F]
00476 06127881 tx [3F]
00477 06128132 tx [3F]
00478 06128381 tx [3F]
00479 06128631 tx [3F]
00480 06128881 tx [3F]
00481 06129132 tx [3F]
00482 06129381 tx [3F]
00483 06129632 tx [3F]
00484 06129882 tx [3F]
00485 06130131 tx [3F]
00486 06130382 tx [3F]
00487 06130632 tx [3F]
00488 06130881 tx [3F]
00489 06131132 tx [3F]
00490 06131382 tx [3F]
00491 06131631 tx [3F]
00492 06131882 tx [3F]
00493 06132133 tx [3F]
00494 06132382 tx [3F]
00495 06132631 tx [3F]
00496 06132882 tx [3F]
00497 06133131 tx [3F]
00498 06133382 tx [3F]

**My question is : because not received 3F also in my program?

Help me please!**

[costycnc]

I find myself the solution.
The problem was the code ... that not was complete
I insert this code from here

import socket
import sys
import time

def run():
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_address = ('0.0.0.0', 23)
print('starting up on {} port {}'.format(*server_address))
sock.bind(server_address)
sock.listen(0)
while (True):
print('waiting for a connection')
connection, client_address = sock.accept()
print('connection from', client_address)
connection.setblocking(False)
while (True):
try:
data = connection.recv(16)
print('received {!r}'.format(data))
if data:
print('sending data back to the client')
connection.sendall(data)
else:
print('No data: connection closed by the client')
break;
except Exception as e:
print('Exception: ', e)
print('no data from', client_address)
time.sleep(1)

# Clean up the connection.
connection.close()
print("closed. ")

run()

and now received

Connected to TIM-32883215
ftpserver is running.
URL: 192.168.1.9:21 username: "user", password:"12345678"
192.168.1.9
starting up on 0.0.0.0 port 23
waiting for a connection
connection from ('192.168.1.11', 54868)
received b'\x05'
sending data back to the client
Exception: [Errno 11] EAGAIN
no data from ('192.168.1.11', 54868)
received b'\x05'
sending data back to the client
received b'\x05'
sending data back to the client
received b'\x05'
sending data back to the client
received b'\x05'
sending data back to the client
received b'\x05'
sending data back to the client
Exception: [Errno 11] EAGAIN
no data from ('192.168.1.11', 54868)
received b'\x05'
sending data back to the client
received b'\x05'
sending data back to the client
received b'\x05'