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receiver.py

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+#!/usr/bin/env python3
+#receiver.py
+
+import os, sys, getopt, time
+from netinterface import network_interface
+
+NET_PATH = './'
+OWN_ADDR = 'B'
+
+# ------------       
+# main program
+# ------------
+
+try:
+	opts, args = getopt.getopt(sys.argv[1:], shortopts='hp:a:', longopts=['help', 'path=', 'addr='])
+except getopt.GetoptError:
+	print('Usage: python receiver.py -p <network path> -a <own addr>')
+	sys.exit(1)
+
+for opt, arg in opts:
+	if opt == '-h' or opt == '--help':
+		print('Usage: python receiver.py -p <network path> -a <own addr>')
+		sys.exit(0)
+	elif opt == '-p' or opt == '--path':
+		NET_PATH = arg
+	elif opt == '-a' or opt == '--addr':
+		OWN_ADDR = arg
+
+if (NET_PATH[-1] != '/') and (NET_PATH[-1] != '\\'): NET_PATH += '/'
+
+if not os.access(NET_PATH, os.F_OK):
+	print('Error: Cannot access path ' + NET_PATH)
+	sys.exit(1)
+
+if len(OWN_ADDR) > 1: OWN_ADDR = OWN_ADDR[0]
+
+if OWN_ADDR not in network_interface.addr_space:
+	print('Error: Invalid address ' + OWN_ADDR)
+	sys.exit(1)
+
+# main loop
+netif = network_interface(NET_PATH, OWN_ADDR)
+print('Main loop started...')
+while True:
+# Calling receive_msg() in non-blocking mode ... 
+#	status, msg = netif.receive_msg(blocking=False)    
+#	if status: print(msg)      # if status is True, then a message was returned in msg
+#	else: time.sleep(2)        # otherwise msg is empty
+
+# Calling receive_msg() in blocking mode ...
+	status, msg = netif.receive_msg(blocking=True)      # when returns, status is True and msg contains a message 
+	print(msg.decode('utf-8'))
+