python - Cannot send and receive udp message in same program -

i able send , receive udp messages in separate programs, i'm not able same task in 1 program.

import socket  udp_ip = "192.168.1.178" udp_port = 8888 msg = 'test'  print "udp target ip: ", udp_ip print "udp target port: ", udp_port print "message: ", msg  sock = socket.socket(socket.af_inet, socket.sock_dgram) sock.sendto(msg, (udp_ip, udp_port))   udp_ip2 = "192.168.1.198"  sock.bind((udp_ip2, udp_port))  while true:     data, addr = sock.recvfrom(1024) # buffer size 1024 bytes     print "received message:", data 

with program, able send udp messages, however, not able receive messages other machine.

what doing wrong?

in advance,
mikkel

in example try bind socket addr after sending, what's wrong. address can bound socket before data transfer.

if there no explicit bind os sets free (unused) port number in range [1024, 65535] on first .send()/.recv() call.

next, socket can bound single ip (except special case '0.0.0.0' means "all host's interfaces").