working examples

check_connection.py

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+import socket
+import threading
+
+PORT = 54000
+BROADCAST = "255.255.255.255"
+
+udp_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
+udp_socket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
+
+interfaces = socket.getaddrinfo(host=socket.gethostname(), port=None, family=socket.AF_INET)
+for idx, ip in enumerate(interfaces):
+    print(f"{idx}: {ip[-1][0]}")
+
+interface = input("Który interfejs: ")
+ip_addr = interface[int(interface)][-1][0]
+udp_socket.bind((ip_addr, PORT))
+
+def recive_bradcast():
+    print("Nasluchuje....")
+    t = threading.currentThread()
+    while getattr(t, "do_run", True):
+        data, addr = udp_socket.recvfrom(1024)
+        print(f"from: {addr}, recive: {data}")
+
+    print("Przestalem nasluchiwac!")
+
+recv_thread = threading.Thread(target=recive_bradcast)
+recv_thread.start()
+
+
+counter = 0
+while True:
+    choice = input("Wyslac dane?[t/n] ")
+    if choice.lower() == "n":
+        run = False
+        break
+    elif choice.lower() != "t":
+        continue
+
+    counter = counter + 1
+    udp_socket.sendto(f"test connection, counter: {counter}".encode("utf8"), (BROADCAST, PORT))
+
+recv_thread.do_run = False
+udp_socket.close()
+
+
+
+
+
+
+# print(interfaces[int(interface)][-1][0])
+# allips = [ip[-1][0] for ip in interfaces]
+# print(allips)
+
+# print(socket.gethostbyname(socket.gethostname()))
+# print(socket.if_nameindex())
+# print(socket.if_nametoindex(socket.gethostname()))
+# print(interfaces)

client.py

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+#!/usr/bin/env python3
+
+import socket
+
+client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)  # UDP
+
+# Enable port reusage so we will be able to run multiple clients and servers on single (host, port).
+# Do not use socket.SO_REUSEADDR except you using linux(kernel<3.9): goto https://stackoverflow.com/questions/14388706/how-do-so-reuseaddr-and-so-reuseport-differ for more information.
+# For linux hosts all sockets that want to share the same address and port combination must belong to processes that share the same effective user ID!
+# So, on linux(kernel>=3.9) you have to run multiple servers and clients under one user to share the same (host, port).
+# Thanks to @stevenreddie
+# client.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
+
+# Enable broadcasting mode
+client.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
+
+client.bind(("192.168.1.101", 37020))
+while True:
+    # Thanks @seym45 for a fix
+    data, addr = client.recvfrom(1024)
+    # print("received message: %s" % data.decode("utf8"))
+    print(f"from: {addr}, recive: {data}")

server.py

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+#!/usr/bin/env python3
+
+from re import T
+import socket
+import time
+
+server = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
+
+# Enable port reusage so we will be able to run multiple clients and servers on single (host, port).
+# Do not use socket.SO_REUSEADDR except you using linux(kernel<3.9): goto https://stackoverflow.com/questions/14388706/how-do-so-reuseaddr-and-so-reuseport-differ for more information.
+# For linux hosts all sockets that want to share the same address and port combination must belong to processes that share the same effective user ID!
+# So, on linux(kernel>=3.9) you have to run multiple servers and clients under one user to share the same (host, port).
+# Thanks to @stevenreddie
+# server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
+
+# Enable broadcasting mode
+server.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
+server.bind(("192.168.1.101", 5555))
+# Set a timeout so the socket does not block
+# indefinitely when trying to receive data.
+server.settimeout(0.2)
+message = "count: "
+count = 0
+while True:
+    count = count + 1
+    # msg = message.join(str(count)).encode("utf8")
+    msg = f"{message} {count}".encode("utf8")
+    server.sendto(msg, ("255.255.255.255", 37020))
+    # print("message sent!", flush=True)
+    time.sleep(1)