Transport tweaks
****************


SNMPv2c
=======

Send SNMP GET request using the following options:

   * with SNMPv2c, community 'public'

   * over IPv4/UDP with non-default timeout and no retries

   * to an Agent at demo.snmplabs.com:161

   * for two instances of SNMPv2-MIB::sysDescr.0 MIB object,

   * based on Twisted I/O framework

Functionally similar to:

   $ snmpget -v2c -c public -r 0 -t 2 demo.snmplabs.com SNMPv2-MIB::sysDescr.0

   from twisted.internet.task import react
   from pysnmp.hlapi.twisted import *


   def success(args, hostname):
       (errorStatus, errorIndex, varBinds) = args

       if errorStatus:
           print('%s: %s at %s' % (hostname,
                                   errorStatus.prettyPrint(),
                                   errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
       else:
           for varBind in varBinds:
               print(' = '.join([x.prettyPrint() for x in varBind]))


   def failure(errorIndication, hostname):
       print('%s failure: %s' % (hostname, errorIndication))


   # noinspection PyUnusedLocal
   def getSysDescr(reactor, hostname):
       snmpEngine = SnmpEngine()

       d = getCmd(snmpEngine,
                  CommunityData('public'),
                  UdpTransportTarget((hostname, 161), timeout=2.0, retries=0),
                  ContextData(),
                  ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0)))

       d.addCallback(success, hostname).addErrback(failure, hostname)

       return d


   react(getSysDescr, ['demo.snmplabs.com'])

"Download" script.

See also: library reference.
