def _internal_send_packet(server, port, version, packet=None):
if not packet:
packet = NTPPacket(transmit=time.time() + NTPClient.FORMAT_DIFF)
answer = NTPPacket(version_number=version)
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as s:
s.settimeout(NTPClient.WAITING_TIME)
s.sendto(packet.pack(), (server, port))
data = s.recv(48)
arrive_time = time.time() + NTPClient.FORMAT_DIFF
answer.unpack(data)
return answer, arrive_time
