TRAP/INFORM notification

pysnmp.hlapi.twisted.sendNotification(snmpEngine, authData, transportTarget, contextData, notifyType, varBinds, **options)

Sends SNMP notification.

Based on passed parameters, prepares SNMP TRAP or INFORM message (RFC 1905#section-4.2.6) and schedules its transmission by twisted I/O framework at a later point of time.

  • snmpEngine (SnmpEngine) – Class instance representing SNMP engine.
  • authData (CommunityData or UsmUserData) – Class instance representing SNMP credentials.
  • transportTarget (UdpTransportTarget or Udp6TransportTarget) – Class instance representing transport type along with SNMP peer address.
  • contextData (ContextData) – Class instance representing SNMP ContextEngineId and ContextName values.
  • notifyType (str) – Indicates type of notification to be sent. Recognized literal values are trap or inform.
  • varBinds (tuple) – Single NotificationType class instance representing a minimum sequence of MIB variables required for particular notification type. Alternatively, a sequence of ObjectType objects could be passed instead. In the latter case it is up to the user to ensure proper Notification PDU contents.
Other Parameters:


Request options:

  • lookupMib - load MIB and resolve response MIB variables at the cost of slightly reduced performance. Default is True.

deferred (Deferred) – Twisted Deferred object representing work-in-progress. User is expected to attach his own success and error callback functions to the Deferred object though addCallbacks() method.


PySnmpError – Or its derivative indicating that an error occurred while performing SNMP operation.


User success callback is called with the following tuple as its first argument:

  • errorStatus (str) : True value indicates SNMP PDU error.
  • errorIndex (int) : Non-zero value refers to varBinds[errorIndex-1]
  • varBinds (tuple) : A sequence of ObjectType class instances representing MIB variables returned in SNMP response.

User error callback is called with errorIndication object wrapped in Failure object.


>>> from twisted.internet.task import react
>>> from pysnmp.hlapi.twisted import *
>>> def success(args):
...     (errorStatus, errorIndex, varBinds) = args
...     print(errorStatus, errorIndex, varBind)
>>> def failure(errorIndication):
...     print(errorIndication)
>>> def run(reactor):
...     d = sendNotification(SnmpEngine(),
...                          CommunityData('public'),
...                          UdpTransportTarget(('', 162)),
...                          ContextData(),
...                          'trap',
...                          NotificationType(ObjectIdentity('IF-MIB', 'linkDown')))
...     d.addCallback(success).addErrback(failure)
...     return d
>>> react(run)
(0, 0, [])