YACWC

old/udp_server.py

@@ -0,0 +1,22 @@
+
+import socket
+
+MCAST_GRP = '239.255.255.255'
+MCAST_PORT = 5007
+# regarding socket.IP_MULTICAST_TTL
+# ---------------------------------
+# for all packets sent, after two hops on the network the packet will not 
+# be re-sent/broadcast (see https://www.tldp.org/HOWTO/Multicast-HOWTO-6.html)
+MULTICAST_TTL = 2
+
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
+sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, MULTICAST_TTL)
+
+# For Python 3, change next line to 'sock.sendto(b"robot", ...' to avoid the
+# "bytes-like object is required" msg (https://stackoverflow.com/a/42612820)
+
+from datetime import datetime
+import time
+for i in range(100):
+    dsend = str(i)+' '+str(datetime.now())
+    sock.sendto(dsend.encode(), (MCAST_GRP, MCAST_PORT))