new_contents: import stl_path
  from trex_stl_lib.api import *
  
  import imp
  import time
  import json
  from pprint import pprint
  import argparse
  
  # IMIX test
  # it maps the ports to sides
  # then it load a predefind profile 'IMIX'
  # and attach it to both sides and inject
  # at a certain rate for some time
  # finally it checks that all packets arrived
  def imix_test (server):
      
  
      # create client
      c = STLClient(server = server)
      passed = True
  
  
      try:
  
          # connect to server
          c.connect()
  
          # take all the ports
          c.reset()
  
      	dir_0 = [0]
      	dir_1 = [1]
  
          print "Mapped ports to sides {0} <--> {1}".format(dir_0, dir_1)
  
          # load IMIX profile
          profile1 = STLProfile.load_py('../../../../stl/imix.py', direction=0)
          profile2 = STLProfile.load_py('../../../../stl/imix.py', direction=1)
          stream1 = profile1.get_streams()
          stream2 = profile2.get_streams()
  
          # add both streams to ports
          c.add_streams(stream1, ports = dir_0)
          c.add_streams(stream2, ports = dir_1)
          
          # clear the stats before injecting
          c.clear_stats()
  
          # choose rate and start traffic for 10 seconds on 5 mpps
          duration = 30
          mult = "30%"
          print "Injecting {0} <--> {1} on total rate of '{2}' for {3} seconds".format(dir_0, dir_1, mult, duration)
  
          c.start(ports = (dir_0 + dir_1), mult = mult, duration = duration, total = True)
          
          # block until done
          c.wait_on_traffic(ports = (dir_0 + dir_1))
  
          # read the stats after the test
          stats = c.get_stats()
  
          # use this for debug info on all the stats
          pprint(stats)
  
          # sum dir 0
          dir_0_opackets = sum([stats[i]["opackets"] for i in dir_0])
          dir_0_ipackets = sum([stats[i]["ipackets"] for i in dir_0])
  
          # sum dir 1
          dir_1_opackets = sum([stats[i]["opackets"] for i in dir_1])
          dir_1_ipackets = sum([stats[i]["ipackets"] for i in dir_1])
  
  
          lost_0 = dir_0_opackets - dir_1_ipackets
          lost_1 = dir_1_opackets - dir_0_ipackets
  
          print "\nPackets injected from {0}: {1:,}".format(dir_0, dir_0_opackets)
          print "Packets injected from {0}: {1:,}".format(dir_1, dir_1_opackets)
  
          print "\npackets lost from {0} --> {1}:   {2:,} pkts".format(dir_0, dir_1, lost_0)
          print "packets lost from {0} --> {1}:   {2:,} pkts".format(dir_1, dir_0, lost_1)
  
          if (lost_0 <= 0) and (lost_1 <= 0): # less or equal because we might have incoming arps etc.
              passed = True
          else:
              passed = False
  
  
      except STLError as e:
          passed = False
          print e
  
      finally:
          c.disconnect()
  
      if passed:
          print "\nTest has passed :-)\n"
          sys.exit(0)
      else:
          print "\nTest has failed :-(\n"
          sys.exit(-1)
  
  parser = argparse.ArgumentParser(description="Example for TRex Stateless, sending IMIX traffic")
  parser.add_argument('-s', '--server',
                      dest='server',
                      help='Remote trex address',
                      default='127.0.0.1',
                      type = str)
  args = parser.parse_args()
  
  # run the tests
  imix_test(args.server)
  
  
subject: add imix_bidir example