# Advanced Notification Originator

## Multiple concurrent queries

Send a bunch of different SNMP Notifications to different peers all at once, wait for responses asynchronously:

- SNMPv1 and SNMPv2c

- with community name ‘public’

- over IPv4/UDP

- send TRAP notification

- to multiple Managers

- with TRAP ID ‘coldStart’ specified as a MIB symbol

- include managed object information specified as var-bind objects pair

$ snmptrap -v1 -c public demo.snmplabs.com 1.3.6.1.4.1.20408.4.1.1.2 demo.snmplabs.com 6 432 12345 1.3.6.1.2.1.1.1.0 s “my system”
$ snmptrap -v2c -c public demo.snmplabs.com 123 1.3.6.1.6.3.1.1.5.1

    from pysnmp.hlapi.asyncore import *

    # List of targets in the followin format:
    # ( ( authData, transportTarget ), ... )
    targets = (
        # 1-st target (SNMPv1 over IPv4/UDP)
        (CommunityData('public', mpModel=0),
         UdpTransportTarget(('demo.snmplabs.com', 162)),
         ContextData()),
        # 2-nd target (SNMPv2c over IPv4/UDP)
        (CommunityData('public'),
         UdpTransportTarget(('demo.snmplabs.com', 162)),
         ContextData()),
    )

    snmpEngine = SnmpEngine()

    for authData, transportTarget, contextData in targets:
        sendNotification(
            snmpEngine,
            authData,
            transportTarget,
            contextData,
            'trap',  # NotifyType
            NotificationType(
                ObjectIdentity('SNMPv2-MIB', 'coldStart')
            ).addVarBinds(
                (ObjectIdentifier('1.3.6.1.2.1.1.1.0'),
                 OctetString('my name'))
            )
        )

    snmpEngine.transportDispatcher.runDispatcher()

`Download` script.

## Multiple concurrent notifications

Send multiple SNMP notifications at once using the following options:

- SNMPv2c and SNMPv3

- with community name ‘public’ or USM username usr-md5-des

- over IPv4/UDP

- send INFORM notification

- to multiple Managers

- with TRAP ID ‘coldStart’ specified as a MIB symbol

- include managed object information specified as var-bind objects pair

$ snmpinform -v2c -c public demo.snmplabs.com 123 1.3.6.1.6.3.1.1.5.1
$ snmpinform -v3 -u usr-md5-des -l authPriv -A authkey1 -X privkey1 demo.snmplabs.com 123 1.3.6.1.6.3.1.1.5.1

    from pysnmp.hlapi.asyncore import *

    # List of targets in the followin format:
    # ( ( authData, transportTarget ), ... )
    targets = (
        # 1-st target (SNMPv2c over IPv4/UDP)
        (CommunityData('public'),
         UdpTransportTarget(('demo.snmplabs.com', 162)),
         ContextData()),
        # 2-nd target (SNMPv3 over IPv4/UDP)
        (UsmUserData('usr-md5-des', 'authkey1', 'privkey1'),
         UdpTransportTarget(('demo.snmplabs.com', 162)),
         ContextData()),
    )

    # noinspection PyUnusedLocal
    def cbFun(snmpEngine, sendRequestHandle, errorIndication,
              errorStatus, errorIndex, varBinds, cbCtx):
        if errorIndication:
            print('Notification %s not sent: %s' % (sendRequestHandle, errorIndication))
        elif errorStatus:
            print('Notification Receiver returned error for %s: %s @%s' %
                  (sendRequestHandle, errorStatus, errorIndex))
        else:
            print('Notification %s delivered:' % sendRequestHandle)
            for name, val in varBinds:
                print('%s = %s' % (name.prettyPrint(), val.prettyPrint()))

    snmpEngine = SnmpEngine()

    for authData, transportTarget, contextData in targets:
        sendPduHandle = sendNotification(
            snmpEngine,
            authData,
            transportTarget,
            contextData,
            'inform',  # NotifyType
            NotificationType(
                ObjectIdentity('SNMPv2-MIB', 'coldStart')
            ).addVarBinds(('1.3.6.1.2.1.1.1.0', 'my name')),
            cbFun=cbFun
        )

    snmpEngine.transportDispatcher.runDispatcher()

`Download` script.

## Multiple SNMP Engines

Send SNMP notifications in behalf of multiple independend SNMP engines using the following options:

- with a single transport dispatcher and two independent SNMP engines

- SNMPv2c and SNMPv3

- with community name ‘public’ or USM username usr-md5-des

- over IPv4/UDP

- send IMFORM notification

- to multiple Managers

- with TRAP ID ‘coldStart’ specified as a MIB symbol

- include managed object information specified as var-bind objects pair

Within this script we have a single asynchronous TransportDispatcher and a single UDP-based transport serving two independent SNMP engines. We use a single instance of AsyncNotificationOriginator with each of SNMP Engines to communicate INFORM notification to remote systems.

When we receive a [response] message from remote system we use a custom message router to choose what of the two SNMP engines data packet should be handed over. The selection criteria we employ here is based on peer’s UDP port number. Other selection criterias are also possible.

$ snmpinform -v2c -c public demo.snmplabs.com:1162 123 1.3.6.1.6.3.1.1.5.1
$ snmpinform -v3 -u usr-md5-des -l authPriv -A authkey1 -X privkey1 demo.snmplabs.com 123 1.3.6.1.6.3.1.1.5.1

    from pysnmp.hlapi.asyncore import *
    from pysnmp.carrier.asyncore.dispatch import AsyncoreDispatcher

    # List of targets in the following format:
    # ( ( authData, transportTarget ), ... )
    targets = (
        # 1-st target (SNMPv2c over IPv4/UDP)
        (CommunityData('public'),
         UdpTransportTarget(('demo.snmplabs.com', 1162)),
         ContextData()),
        # 2-nd target (SNMPv3 over IPv4/UDP)
        (UsmUserData('usr-md5-des', 'authkey1', 'privkey1'),
         UdpTransportTarget(('demo.snmplabs.com', 162)),
         ContextData()),
    )

    # noinspection PyUnusedLocal
    def cbFun(snmpEngine, sendRequestHandle, errorIndication,
              errorStatus, errorIndex, varBinds, cbCtx):
        snmpEngine = cbCtx
        if errorIndication:
            print('Notification %s for %s not sent: %s' % (sendRequestHandle, snmpEngine.snmpEngineID.prettyPrint(), errorIndication))
        elif errorStatus:
            print('Notification Receiver returned error for request %s, SNMP Engine %s: %s @%s' % (sendRequestHandle, snmpEngine.snmpEngineID.prettyPrint(), errorStatus, errorIndex))
        else:
            print('Notification %s for SNMP Engine %s delivered:' % (sendRequestHandle, snmpEngine.snmpEngineID.prettyPrint()))
            for name, val in varBinds:
                print('%s = %s' % (name.prettyPrint(), val.prettyPrint()))

    # Instantiate the single transport dispatcher object
    transportDispatcher = AsyncoreDispatcher()

    # Setup a custom data routing function to select snmpEngine by transportDomain
    transportDispatcher.registerRoutingCbFun(
        lambda td, ta, d: ta[1] % 3 and 'A' or 'B'
    )

    snmpEngineA = SnmpEngine()
    snmpEngineA.registerTransportDispatcher(transportDispatcher, 'A')

    snmpEngineB = SnmpEngine()
    snmpEngineB.registerTransportDispatcher(transportDispatcher, 'B')

    for authData, transportTarget, contextData in targets:
        snmpEngine = (transportTarget.getTransportInfo()[1][1] % 3 and
                      snmpEngineA or snmpEngineB)
        sendPduHandle = sendNotification(
            snmpEngine,
            authData,
            transportTarget,
            contextData,
            'inform',  # NotifyType
            NotificationType(
                ObjectIdentity('SNMPv2-MIB', 'coldStart')
            ).addVarBinds(('1.3.6.1.2.1.1.1.0', 'my name')),
            cbFun=cbFun, cbCtx=snmpEngine
        )

    transportDispatcher.runDispatcher()

`Download` script.

See also: library reference.