Add -b option and sleep shorter.
diff --git a/Demo/sockets/mcast.py b/Demo/sockets/mcast.py
index 6dab50a..5f16ed9 100755
--- 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 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)