"""
Notification to multiple SNMP managers
++++++++++++++++++++++++++++++++++++++

Send SNMP TRAP notifications to multiple Managers using the
following options:

* SNMPv2c
* with community name 'public'
* over IPv4/UDP
* send TRAP notification
* to multiple Managers at 127.0.0.1:162, 127.0.0.2:162
* with TRAP ID 'coldStart' specified as an OID
* include managed objects information:
  1.3.6.1.2.1.1.1.0 = 'Example Notificator'
  1.3.6.1.2.1.1.5.0 = 'Notificator Example'

Functionally similar to:

| $ snmptrap -v2c -c public 127.0.0.1 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s 'Example notification' 1.3.6.1.2.1.1.5.0 s 'Notificator Example'

and

| $ snmptrap -v2c -c public 127.0.0.2 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s 'Example notification' 1.3.6.1.2.1.1.5.0 s 'Notificator Example'

and

| $ snmptrap -v2c -c public 127.0.0.3 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s 'Example notification' 1.3.6.1.2.1.1.5.0 s 'Notificator Example'

"""#
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncore.dgram import udp
from pysnmp.entity.rfc3413 import ntforg
from pysnmp.proto.api import v2c

# Create SNMP engine instance
snmpEngine = engine.SnmpEngine()

# SecurityName <-> CommunityName mapping
config.addV1System(snmpEngine, 'my-area', 'public', transportTag='all-my-managers')

# Specify security settings per SecurityName (SNMPv2c -> 1)
config.addTargetParams(snmpEngine, 'my-creds', 'my-area', 'noAuthNoPriv', 1)

# Setup transport endpoint and bind it with security settings yielding
# a target name
config.addTransport(
    snmpEngine,
    udp.domainName,
    udp.UdpSocketTransport().openClientMode()
)
# First target
config.addTargetAddr(
    snmpEngine, 'my-nms-1',
    udp.domainName, ('127.0.0.1', 162),
    'my-creds',
    tagList='all-my-managers'
)
# Second target
config.addTargetAddr(
    snmpEngine, 'my-nms-2',
    udp.domainName, ('127.0.0.2', 162),
    'my-creds',
    tagList='all-my-managers'
)
# Third target
config.addTargetAddr(
    snmpEngine, 'my-nms-3',
    udp.domainName, ('127.0.0.3', 162),
    'my-creds',
    tagList='all-my-managers'
)

# Specify what kind of notification should be sent (TRAP or INFORM)
# to what targets (chosen by tag) and with what credentials.
config.addNotificationTarget(
    snmpEngine, 'my-notification', 'my-creds', 'all-my-managers', 'trap'
)

# Allow NOTIFY access to Agent's MIB by this SNMP model (2), securityLevel
# and SecurityName
config.addContext(snmpEngine, '')
config.addVacmUser(snmpEngine, 2, 'my-area', 'noAuthNoPriv', (), (), (1,3,6))

# *** SNMP engine configuration is complete by this line ***

# Create Notification Originator App instance. 
ntfOrg = ntforg.NotificationOriginator()
 
# Build and submit notification message to dispatcher
ntfOrg.sendVarBinds(
    snmpEngine,
    # Notification targets
    'my-notification',  # notification targets
    None, '',           # contextEngineId, contextName
    # var-binds
    [
        # SNMPv2-SMI::snmpTrapOID.0 = SNMPv2-MIB::coldStart
        ((1,3,6,1,6,3,1,1,4,1,0), v2c.ObjectIdentifier((1,3,6,1,6,3,1,1,5,1))),
        # additional var-binds: ( (oid, value), ... )
        ((1,3,6,1,2,1,1,1,0), v2c.OctetString('Example Notificator')),
        ((1,3,6,1,2,1,1,5,0), v2c.OctetString('Notificator Example'))
    ]
)

print('Notifications are scheduled to be sent')

# Run I/O dispatcher which would send pending message and process response
snmpEngine.transportDispatcher.runDispatcher()
