Difference from the fork: PEP8 + Fix "Could not find a default OpenFlow controller" issue

mininetSocketTest.py

#!/usr/bin/python

from mininet.node import OVSController

from mininet.topo import SingleSwitchTopo
from mininet.net import Mininet
from mininet.log import lg
from mininet.cli import CLI


def main():
    lg.setLogLevel('info')

    net = Mininet(SingleSwitchTopo(k=2), controller=OVSController)
    net.start()

    h1 = net.get('h1')
    p1 = h1.popen('python myServer.py -i %s &' % h1.IP())

    h2 = net.get('h2')
    h2.cmd('python myClient.py -i %s -m "hello world"' % h1.IP())

    CLI(net)
    p1.terminate()
    net.stop()

if __name__ == '__main__':
    main()

myClient.py

import socket
import optparse

parser = optparse.OptionParser()
parser.add_option('-i', dest='ip', default='127.0.0.1')
parser.add_option('-p', dest='port', type='int', default=12345)
parser.add_option('-m', dest='msg')
(options, args) = parser.parse_args()

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.sendto(options.msg, (options.ip, options.port))

myServer.py

import socket
import optparse

parser = optparse.OptionParser()
parser.add_option('-i', dest='ip', default='')
parser.add_option('-p', dest='port', type='int', default=12345)
(options, args) = parser.parse_args()

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind((options.ip, options.port))

f = open('foo.txt', 'w')
while True:
    data, addr = s.recvfrom(512)
    f.write("%s: %s\n" % (addr, data))
    f.flush()