# SET command

pysnmp.hlapi.asyncore.setCmd(snmpEngine, authData, transportTarget, contextData, *varBinds, **options)

  Performs SNMP SET query.

  Based on passed parameters, prepares SNMP SET packet (RFC 1905 Section 4.2.5) and schedules its transmission by I/O framework at a later point of time.

  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.

    - *varBinds (`ObjectType`) – One or more class instances representing MIB variables to place into SNMP request.

  Other Parameters:

    **options –

    Request options:

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

    > - cbFun (callable) - user-supplied callable that is invoked

    >     to pass SNMP response data or error to user at a later point of time. Default is None.

    > - cbCtx (object) - user-supplied object passing additional

    >     parameters to/from cbFun. Default is None.

  Notes

  User-supplied cbFun callable must have the following call signature:

  - snmpEngine (`SnmpEngine`): Class instance representing SNMP engine.

  - sendRequestHandle (int): Unique request identifier. Can be used for matching multiple ongoing requests with received responses.

  - 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 in exactly the same order as varBinds in request.

  - cbCtx : Original user-supplied object.

  Returns:

    sendRequestHandle (int) – Unique request identifier. Can be used for matching received responses with ongoing requests.

  Raises:

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

  Examples

      >>> from pysnmp.hlapi.asyncore import *
      >>> def cbFun(snmpEngine, sendRequestHandle, errorIndication, errorStatus, errorIndex, varBinds, cbCtx):
      ...     print(errorIndication, errorStatus, errorIndex, varBinds)
      >>>
      >>> snmpEngine = SnmpEngine()
      >>> setCmd(snmpEngine,
      ...        CommunityData('public'),
      ...        UdpTransportTarget(('demo.snmplabs.com', 161)),
      ...        ContextData(),
      ...        ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysContact', 0), 'info@snmplabs.com'),
      ...        cbFun=cbFun)
      >>> snmpEngine.transportDispatcher.runDispatcher()
      (None, 0, 0, [ObjectType(ObjectIdentity(ObjectName('1.3.6.1.2.1.1.4.0')), DisplayString('info@snmplabs.com'))])
      >>>