"""
SNMPv2c
+++++++

Send SNMP GET request using the following options:

  * with SNMPv1, community 'public'
  * over IPv4/UDP
  * to an Agent at demo.snmplabs.com:161
  * for two instances of SNMPv2-MIB::sysDescr.0 MIB object,

Functionally similar to:

| $ snmpget -v2c -c public demo.snmplabs.com SNMPv2-MIB::sysDescr.0

"""#
from pysnmp.hlapi.asyncore import *

def cbFun(snmpEngine, sendRequestHandle, errorIndication, 
          errorStatus, errorIndex, varBinds, cbCtx):
    if errorIndication:
        print(errorIndication)
        return
    elif errorStatus:
        print('%s at %s' % (
                errorStatus.prettyPrint(),
                errorIndex and varBindTable[-1][int(errorIndex)-1][0] or '?'
            )
        )
        return
    else:
        for varBind in varBinds:
            print(' = '.join([ x.prettyPrint() for x in varBind ]))

snmpEngine = SnmpEngine()

getCmd(snmpEngine,
       CommunityData('public'),
       UdpTransportTarget(('demo.snmplabs.com', 161)),
       ContextData(),
       ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0)),
       cbFun=cbFun)

snmpEngine.transportDispatcher.runDispatcher()
