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Example or udp discovery in python
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import socket | |
import time | |
import uuid | |
import struct | |
instance_id = uuid.uuid4().hex | |
payload = "this is data" | |
multicast_group = ('224.31.5.85', 19845) | |
discovery = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) | |
ttl = struct.pack('b', 1) | |
discovery.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, ttl) | |
discovery.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) | |
discovery.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1) | |
group = socket.inet_aton(multicast_group[0]) | |
mreq = struct.pack('4sL', group, socket.INADDR_ANY) | |
discovery.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq) | |
discovery.settimeout(0.2) | |
discovery.bind(("", 19845)) | |
while True: | |
message = "/".join([instance_id, payload]).encode() | |
# send discovery message | |
discovery.sendto(message, multicast_group) | |
# process all other received messages | |
while True: | |
try: | |
data, addr = discovery.recvfrom(1024) | |
except socket.timeout: | |
break | |
else: | |
rec_instance_id, rec_payload = data.decode().split("/") | |
if not rec_instance_id == instance_id: | |
print("received message: {} from {}".format(data, addr)) | |
time.sleep(1) |
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