text: """
  Using multiple network transports
  +++++++++++++++++++++++++++++++++
  
  Receive SNMP TRAP/INFORM messages with the following options:
  
  * SNMPv1/SNMPv2c
  * with SNMP community "public"
  * over IPv4/UDP, listening at 127.0.0.1:162
    over IPv6/UDP, listening at [::1]:162
  * print received data on stdout
  
  Either of the following Net-SNMP commands will send notifications to this
  receiver:
  
  | $ snmptrap -v1 -c public 127.0.0.1 1.3.6.1.4.1.20408.4.1.1.2 127.0.0.1 1 1 123 1.3.6.1.2.1.1.1.0 s test
  | $ snmptrap -v2c -c public udp6:[::1]:162 123 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.5.0 s test
  | $ snmpinform -v2c -c public 127.0.0.1 123 1.3.6.1.6.3.1.1.5.1
  
  """#
  from pysnmp.entity import engine, config
  from pysnmp.carrier.asyncore.dgram import udp, udp6
  from pysnmp.entity.rfc3413 import ntfrcv
  
  # Create SNMP engine with autogenernated engineID and pre-bound
  # to socket transport dispatcher
  snmpEngine = engine.SnmpEngine()
  
  # Transport setup
  
  # UDP over IPv4
  config.addTransport(
      snmpEngine,
      udp.domainName,
      udp.UdpTransport().openServerMode(('127.0.0.1', 162))
  )
  
  # UDP over IPv6
  config.addTransport(
      snmpEngine,
      udp6.domainName,
      udp6.Udp6Transport().openServerMode(('::1', 162))
  )
  
  # SNMPv1/2c setup
  
  # SecurityName <-> CommunityName mapping
  config.addV1System(snmpEngine, 'my-area', 'public')
  
  
  # Callback function for receiving notifications
  # noinspection PyUnusedLocal,PyUnusedLocal,PyUnusedLocal
  def cbFun(snmpEngine, stateReference, contextEngineId, contextName,
            varBinds, cbCtx):
      print('Notification from ContextEngineId "%s", ContextName "%s"' % (contextEngineId.prettyPrint(),
                                                                          contextName.prettyPrint()))
      for name, val in varBinds:
          print('%s = %s' % (name.prettyPrint(), val.prettyPrint()))
  
  
  # Register SNMP Application at the SNMP engine
  ntfrcv.NotificationReceiver(snmpEngine, cbFun)
  
  snmpEngine.transportDispatcher.jobStarted(1)  # this job would never finish
  
  # Run I/O dispatcher which would receive queries and send confirmations
  try:
      snmpEngine.transportDispatcher.runDispatcher()
  except:
      snmpEngine.transportDispatcher.closeDispatcher()
      raise
  