def main():
    usagestr = "usage: %prog [-h] [options] [args]"
    parser = optparse.OptionParser(usage = usagestr)
    parser.set_defaults(numnodes = 5)

    parser.add_option("-n", "--numnodes", dest = "numnodes", type = int,
                      help = "number of nodes")

    def usage(msg = None, err = 0):
        sys.stdout.write("\n")
        if msg:
            sys.stdout.write(msg + "\n\n")
        parser.print_help()
        sys.exit(err)

    # parse command line options
    (options, args) = parser.parse_args()

    if options.numnodes < 1:
        usage("invalid number of nodes: %s" % options.numnodes)

    for a in args:
        sys.stderr.write("ignoring command line argument: '%s'\n" % a)

    start = datetime.datetime.now()

    # IP subnet
    prefix = ipaddr.IPv4Prefix("10.83.0.0/16")
    # session with some EMANE initialization
    cfg = {'verbose': 'false'}
    session = pycore.Session(cfg = cfg, persistent = True)
    session.master = True
    session.location.setrefgeo(47.57917,-122.13232,2.00000)
    session.location.refscale = 150.0
    session.cfg['emane_models'] = "RfPipe, Ieee80211abg, Bypass"
    session.emane.loadmodels()
    if 'server' in globals():
        server.addsession(session)

    # EMANE WLAN
    print "creating EMANE WLAN wlan1"
    wlan = session.addobj(cls = pycore.nodes.EmaneNode, name = "wlan1")
    wlan.setposition(x=80,y=50)
    names = EmaneIeee80211abgModel.getnames()
    values = list(EmaneIeee80211abgModel.getdefaultvalues())
    # TODO: change any of the EMANE 802.11 parameter values here
    for i in range(0, len(names)):
        print "EMANE 80211 \"%s\" = \"%s\"" % (names[i], values[i])
    try:
        values[ names.index('pathlossmode') ] = '2ray'
    except __HOLE__:
        values[ names.index('propagationmodel') ] = '2ray'
        
    session.emane.setconfig(wlan.objid, EmaneIeee80211abgModel._name, values)
    services_str = "zebra|OSPFv3MDR|vtysh|IPForward"

    print "creating %d nodes with addresses from %s" % \
          (options.numnodes, prefix)
    for i in xrange(1, options.numnodes + 1):
        tmp = session.addobj(cls = pycore.nodes.CoreNode, name = "n%d" % i,
                             objid=i)
        tmp.newnetif(wlan, ["%s/%s" % (prefix.addr(i), prefix.prefixlen)])
        tmp.cmd([SYSCTL_BIN, "net.ipv4.icmp_echo_ignore_broadcasts=0"])
        tmp.setposition(x=150*i,y=150)
        session.services.addservicestonode(tmp, "", services_str, verbose=False)
        n.append(tmp)

    # this starts EMANE, etc.
    session.node_count = str(options.numnodes + 1)
    session.instantiate()

    # start a shell on node 1
    n[1].term("bash")

    print "elapsed time: %s" % (datetime.datetime.now() - start)
dataset/ETHPy150Open coreemu/core/daemon/examples/netns/emane80211.py/main