move towards single implementation for socket client/server using asyncore and threads

datagram/UdpMulticastClient.py

@@ -0,0 +1,29 @@
+import socket
+import struct
+import sys
+
+multicast_group = '224.3.29.71'
+server_address = ('', 10000)
+
+# Create the socket
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+
+# Bind to the server address
+sock.bind(server_address)
+
+# Tell the operating system to add the socket to the multicast group
+# on all interfaces.
+group = socket.inet_aton(multicast_group)
+mreq = struct.pack('4sL', group, socket.INADDR_ANY)
+sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
+
+# Receive/respond loop
+while True:
+    print >>sys.stderr, '\nwaiting to receive message'
+    data, address = sock.recvfrom(1024)
+    
+    print >>sys.stderr, 'received %s bytes from %s' % (len(data), address)
+    print >>sys.stderr, data
+
+    print >>sys.stderr, 'sending acknowledgement to', address
+    sock.sendto('ack', address)