Dear all,
I am a python newbie, but I intend to program a python script that
communicates with Labview via a UDP socket.
I managed to send LabView strings, but the other way around is not
working.
The code seems to stop working while in the first while loop. I can
see the word "test" being print out.
When I start LabView UDP_sender.vi it is supposed to send a string
back to python, but sometimes it ends with an error saying the port
and the ip is already in usage. Do I have to start first LabView or
the python scrip when listening to LabView, please?
It would be great if you could have a look on my code and could maybe
see why it does nothing after "print test", please.
Thank you very much.
Kind regards,
G.
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__author__="User"
__date__ ="$11.09.2011 19:34:03$"
if __name__ == "__main__":
print "Das ist ein Test"
import socket
import time
#Define global variables for UDP_IP and UDP_Port, needs to be changed
for PETRA-3
#global UDP_IP
UDP_IP="127.0.0.1"
print "UDP_IP is", UDP_IP
#global UDP_PORT
UDP_PORT=21312
print "UDP_PORT is", UDP_PORT
def openUDPSocket(UDP_IP,UDP_PORT):
#UDP_IP="127.0.0.1"
#UDP_PORT=5005
print "Creating socket ..."
sock=socket.socket( socket.AF_INET, # Internet
socket.SOCK_DGRAM ) # UDP
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
#sock.setblocking(0)
#sock.bind((UDP_IP,UDP_PORT))
#sock.listen(1)
print "Done."
return sock
def fastPump(sock):
# Start pumping and return
MESSAGE="pumpfast"
# print "UDP target IP:", UDP_IP
# print "UDP target port:", UDP_PORT
# print "message:", MESSAGE
sock.sendto( MESSAGE, (UDP_IP, UDP_PORT) )
def slowPump(sock):
MESSAGE="pumpslow"
sock.sendto( MESSAGE, (UDP_IP, UDP_PORT) )
pumpsocketUDP=openUDPSocket(UDP_IP,UDP_PORT)
# Receive messages
counter_while_loop=0
print "test"
while counter_while_loop < 3:
data,addr = pumpsocketUDP.recvfrom(1024)
print "test"
if not data:
print "Client has exited!"
break
else:
print "\nReceived message '", data,"'"
counter_while_loop=counter_while_loop+1
counter_while_loop=0
while counter_while_loop < 3:
fastPump(pumpsocketUDP)
time.sleep(5)
slowPump(pumpsocketUDP)
time.sleep(3)
counter_while_loop=counter_while_loop+1
print "Counter_while_loop", counter_while_loop
# Close socket
pumpsocketUDP.close()
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