"""
SNMPv3: master auth and privacy keys
++++++++++++++++++++++++++++++++++++

Send SNMP GET request using the following options:

* with SNMPv3, user 'usr-md5-des', MD5 authentication, DES encryption
* use master auth and privacy keys instead of pass-phrase
* over IPv4/UDP
* to an Agent at demo.pysnmp.com:161
* for SNMPv2-MIB::sysDescr.0 MIB object instance

Functionally similar to:

| $ snmpget -v3 -l authPriv \
      -u usr-md5-des \
      -3m 0x1dcf59e86553b3afa5d32fd5d61bf0cf \
      -3M 0xec5ab55e93e1d85cb6846d0f23e845e0 \
      demo.pysnmp.com SNMPv2-MIB::sysDescr.0

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


async def run_snmp_get():
    iterator = await getCmd(
        SnmpEngine(),
        UsmUserData(
            "usr-md5-des",
            authKey=OctetString(hexValue="1dcf59e86553b3afa5d32fd5d61bf0cf"),
            privKey=OctetString(hexValue="ec5ab55e93e1d85cb6846d0f23e845e0"),
            authKeyType=USM_KEY_TYPE_MASTER,
            privKeyType=USM_KEY_TYPE_MASTER,
        ),
        UdpTransportTarget(("demo.pysnmp.com", 161)),
        ContextData(),
        ObjectType(ObjectIdentity("SNMPv2-MIB", "sysDescr", 0)),
    )

    errorIndication, errorStatus, errorIndex, varBinds = iterator

    if errorIndication:
        print(errorIndication)

    elif errorStatus:
        print(
            "{} at {}".format(
                errorStatus.prettyPrint(),
                errorIndex and varBinds[int(errorIndex) - 1][0] or "?",
            )
        )

    else:
        for varBind in varBinds:
            print(" = ".join([x.prettyPrint() for x in varBind]))


asyncio.run(run_snmp_get())
