Add -b option and sleep shorter.

diff --git a/Demo/sockets/mcast.py b/Demo/sockets/mcast.py
index 6dab50a1e280b71ffe320ff17d5595546083de85..5f16ed9479c3612d5c733cb85e27280c5eaf528a 100755 (executable)
--- a/Demo/sockets/mcast.py
+++ b/Demo/sockets/mcast.py
@@ -2,6 +2,7 @@
 # After /usr/people/4Dgifts/examples/network/mcast.c
 # Usage:
 #   mcast -s (sender)
+#   mcast -b (sender, using broadcast instead multicast)
 #   mcast    (receivers)
 
 MYPORT = 8123
@@ -14,21 +15,26 @@ from socket import *
 from SOCKET import *
 from IN import *
 
-sender = (sys.argv[1:2] == ['-s'])
+sender = sys.argv[1:]
 
 s = socket(AF_INET, SOCK_DGRAM)
 
 if sender:
-       # Ugly: construct decimal IP address string from MYGROUP_BYTES
-       mygroup = ''
-       for byte in MYGROUP_BYTES: mygroup = mygroup + '.' + `byte`
-       mygroup = mygroup[1:]
-       ttl = struct.pack('b', 1)               # Time-to-live
-       s.setsockopt(IPPROTO_IP, IP_MULTICAST_TTL, ttl)
+       if sys.argv[1] == '-b':
+               s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
+               mygroup = '<broadcast>'
+       else:
+               # Ugly: construct decimal IP address string from MYGROUP_BYTES
+               mygroup = ''
+               for byte in MYGROUP_BYTES: mygroup = mygroup + '.' + `byte`
+               mygroup = mygroup[1:]
+               ttl = struct.pack('b', 1)               # Time-to-live
+               s.setsockopt(IPPROTO_IP, IP_MULTICAST_TTL, ttl)
        while 1:
-               data = `time.time()` + '\n'
+               data = `time.time()`
+##             data = data + (1400 - len(data)) * '\0'
                s.sendto(data, (mygroup, MYPORT))
-               time.sleep(5)
+               time.sleep(1)
 else:
        # Bind the socket to my port
        s.bind('', MYPORT)