#!/usr/bin/env python3
import argparse
import logging
import socket
import sys

def main():
	parser = argparse.ArgumentParser()
	parser.add_argument("host", help="The IPv6 address of the host to connect to.")
	parser.add_argument("--port", "-p", default=50007, help="The port to connect to.")
	args = parser.parse_args()

	s = None
	for res in socket.getaddrinfo(args.host, args.port, socket.AF_UNSPEC, socket.SOCK_STREAM):
		af, socktype, proto, canonname, sa = res
		try:
			s = socket.socket(af, socktype, proto)
		except OSError as msg:
			s = None
			continue
		try:
			s.connect(sa)
		except OSError as msg:
			s.close()
			s = None
			continue
		break
	if s is None:
		print('could not open socket')
		sys.exit(1)
	with s:
		s.sendall(b'Hello, world')
		data = s.recv(1024)
	print('Received', repr(data))

	if __name__ == "__main__":
		main()

if __name__ == "__main__":
	main()