tcpclient: slow connection

The following:

t = tcpclient('localhost', port);

takes about 2sec instead of being instantaneous.

I'm connecting to a python server (runs in a short script), which was tested with a python client.

An example server:

#!/usr/bin/env python3

import socket

HOST = '127.0.0.1'

PORT = 65432

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

s.bind((HOST, PORT))

s.listen()

conn, addr = s.accept()

with conn:

print('Connected by', addr)

while True:

data = conn.recv(1024)

if not data:

break

print( data )

An example client:

%echotcpip( "on", 65432 )

tic;

%t = tcpclient( '127.0.0.1', 65432 );

t = tcpclient( 'localhost', 65432 );

toc;

write(t, uint8('hi'));

clear t

%echotcpip("off")

Playing with it further:

• There's no slowdown when connecting to echotcpip.
• If I connect to '127.0.0.1', there's no slowdown. According to the doc, this address uses IPv4, while 'localhost' uses IPv6. Maybe it's something with my win10 (which is totally unreliable, and you can't know what they break each update).