joiner
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	#!/usr/bin/env python3

	#
	# Multiplexer joiner (sends the output from one NMEA server to another)
	# ONE WAY ONLY, from HOST1 to HOST2
	#

	import socket, sys

	###### main #####
	if(len(sys.argv) < 4):
	print("Usage : " + sys.argv[0] + " from_IP from_PORT to_IP to_PORT")
	sys.exit()

	FROM_HOST = sys.argv[1]
	FROM_PORT = int(sys.argv[2])
	TO_HOST = sys.argv[3]
	TO_PORT = int(sys.argv[4])

	RECV_BUFFER = 4096 # Advisable to keep it as an exponent of 2

	# Connect to FROM
	print("Connecting to server #1 (FROM) (" + FROM_HOST + ":" + str(FROM_PORT) + ")")
	try:
	sfrom = socket.socket()
	sfrom.connect((FROM_HOST,FROM_PORT))
	except:
	print("Error while connecting to server #1 (FROM).")
	sys.exit()

	# Connect to TO
	print("Connecting to server #2 (TO) (" + TO_HOST + ":" + str(TO_PORT) + ")")
	try:
	sto = socket.socket()
	sto.connect((TO_HOST,TO_PORT))
	except:
	print("Error while connecting to server #2 (TO).")
	sys.exit()

	print("Joiner is now connected. Press Ctrl-C to quit.")

	while 1:
	try:
	data = sfrom.recv(RECV_BUFFER)
	if data:
	sto.send(data)
	except:
	print
	print("Disconnected.")
	sfrom.close()
	sto.close()
	sys.exit()