# TRAP/INFORM notification

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

  Creates a generator to send SNMP notification.

  When iterator gets advanced by `asyncio` main loop, SNMP TRAP or INFORM notification is send (RFC 1905#section-4.2.6). The iterator yields `asyncio.get_running_loop().create_future()` which gets done whenever response arrives or error occurs.

  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 (`ErrorIndication`) – 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

      >>> import asyncio
      >>> from pysnmp.hlapi.asyncio import *
      >>>
      >>> async def run():
      ...     send_result = await sendNotification(
      ...         SnmpEngine(),
      ...         CommunityData('public'),
      ...         UdpTransportTarget(('demo.pysnmp.com', 162)),
      ...         ContextData(),
      ...         'trap',
      ...         NotificationType(ObjectIdentity('IF-MIB', 'linkDown')))
      ...     errorIndication, errorStatus, errorIndex, varBinds = await send_result
      ...     print(errorIndication, errorStatus, errorIndex, varBinds)
      ...
      >>> asyncio.run(run())
      (None, 0, 0, [])
      >>>