Initial

scripts/multicastUDP_receiver.py

@@ -0,0 +1,59 @@
+import socket
+import struct
+import sys
+from datetime import datetime
+import queue
+
+# ip address of network interface
+MCAST_IF_IP = '192.168.178.66'
+
+multicast_group = '230.120.10.2'
+server_address = ('', 8123)
+
+# Create the socket
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+
+# Bind to the server address
+sock.bind(server_address)
+
+print("Start")
+
+# Tell the operating system to add the socket to the multicast group
+# on all interfaces.
+group = socket.inet_aton(multicast_group)
+mreq = struct.pack('4s4s', group, socket.inet_aton(MCAST_IF_IP))
+sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
+
+print("Ready")
+saveCounter = 0
+
+buffer = queue.Queue(20)
+
+# Receive/respond loop
+while True:
+    data, address = sock.recvfrom(1024)
+    data_str = data.decode("utf-8").strip()
+    print(address, ": ", data_str)
+    data_str = datetime.now().strftime('%b-%d-%Y_%H%M%S') + ": " + data_str
+    buffer.put(data_str)
+    if buffer.full():
+        buffer.get()
+
+
+    if "NTP-Update not successful" in data_str or "Start program" in data_str:
+        f = open("log.txt",'a')
+        while not buffer.empty():    
+            f.write(buffer.get())
+            f.write("\n")
+        f.close()
+        saveCounter = 20
+        
+    if saveCounter > 0:
+        f = open("log.txt",'a')
+        f.write(data_str)
+        f.write("\n")
+        if saveCounter == 1:
+            f.write("\n")
+        f.close()
+        saveCounter -= 1
+