Script improvements regarding finding eth0 IP.

scripts/multicastUDP_receiver.py

@@ -1,14 +1,17 @@
-import socket
-import struct
-import sys
 from datetime import datetime
 import queue
+import socket
+import struct
 
-# ip address of network interface
-MCAST_IF_IP = '192.168.178.66'
 
-multicast_group = '230.120.10.2'
-server_address = ('', 8123)
+def get_ip_address():
+    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    s.connect(("1.1.1.1", 80))
+    return s.getsockname()[0]
+
+
+multicast_group = "230.120.10.2"
+server_address = ("", 8123)
 
 # Create the socket
 sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
@@ -21,7 +24,7 @@ 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))
+mreq = struct.pack("4s4s", group, socket.inet_aton(get_ip_address()))
 sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
 
 print("Ready")
@@ -34,26 +37,24 @@ 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
+    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 = 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 = open("log.txt", "a")
         f.write(data_str)
         f.write("\n")
         if saveCounter == 1:
             f.write("\n")
         f.close()
         saveCounter -= 1
-