socket problem

0_this_works.py

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.bind(('', 5556))
s.connect(('192.168.1.1', 5556))

s.send(b'first')
s.send(b'second')

1_but_this_doesnt.py

import socket
import time

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.bind(('', 5556))
s.connect(('192.168.1.1', 5556))

s.send(b'first')
time.sleep(0.5)
s.send(b'second')  # ConnectionRefusedError

2_this_do_the_job_again.py

import socket
import time

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.sendto(b'first', ('192.168.1.1', 5556))
time.sleep(0.5)
s.sendto(b'second', ('192.168.1.1', 5556))