# TRAP/INFORM notification

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

  Creates a generator to send one or more SNMP notifications.

  On each iteration, new SNMP TRAP or INFORM notification is send (RFC 1905#section-4,2,6). The iterator blocks waiting for INFORM acknowlegement to arrive or error to occur.

  Parameters

    - 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

    **options –

    Request options:

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

  Yields

    - errorIndication (str) – True value indicates SNMP engine error.

    - 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.

  Raises

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

  Notes

  The sendNotification generator will be exhausted immidiately unless an instance of `NotificationType` class or a sequence of `ObjectType` varBinds are send back into running generator (supported since Python 2.6).

  Examples

      >>> from pysnmp.hlapi import *
      >>> g = sendNotification(SnmpEngine(),
      ...                      CommunityData('public'),
      ...                      UdpTransportTarget(('demo.snmplabs.com', 162)),
      ...                      ContextData(),
      ...                      'trap',
      ...                      NotificationType(ObjectIdentity('IF-MIB', 'linkDown')))
      >>> next(g)
      (None, 0, 0, [])
      >>>