"""
Fetch table row by composite index
++++++++++++++++++++++++++++++++++

Send SNMP GET request using the following options:

* with SNMPv3, user 'usr-sha-aes128', SHA auth, AES128 privacy
* over IPv4/UDP
* to an Agent at demo.snmplabs.com:161
* for TCP-MIB::tcpConnLocalAddress."0.0.0.0".22."0.0.0.0".0 MIB object

Functionally similar to:

| $ snmpget -v3 -l authPriv -u usr-md5-des -A authkey1 -X privkey1 \
|           -a SHA -x AES \
|           demo.snmplabs.com \
|           TCP-MIB::tcpConnLocalAddress."0.0.0.0".22."0.0.0.0".0 

"""#
from pysnmp.hlapi import *

errorIndication, errorStatus, errorIndex, varBinds = next(
    getCmd(SnmpEngine(),
           UsmUserData('usr-sha-aes128', 'authkey1', 'privkey1',
                       authProtocol=usmHMACSHAAuthProtocol,
                       privProtocol=usmAesCfb128Protocol ),
           UdpTransportTarget(('demo.snmplabs.com', 161)),
           ContextData(),
           ObjectType(ObjectIdentity('TCP-MIB',
                                     'tcpConnLocalAddress',
                                     '0.0.0.0', 22,
                                     '0.0.0.0', 0))
    )
)

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