# Advanced Command Generator

## Concurrent queries

Send multiple SNMP GET requests at once using the following options:

- with SNMPv2c, community ‘public’

- over IPv4/UDP

- to multiple Agents at demo.pysnmp.com

- for instance of SNMPv2-MIB::sysDescr.0 MIB object

- based on asyncio I/O framework

Functionally similar to:

$ snmpget -v2c -c public demo.pysnmp.com:161 SNMPv2-MIB::sysDescr.0
$ snmpget -v2c -c public demo.pysnmp.com:161 SNMPv2-MIB::sysDescr.0
$ snmpget -v2c -c public demo.pysnmp.com:161 SNMPv2-MIB::sysDescr.0

    import asyncio
    from pysnmp.hlapi.v1arch.asyncio import *

    async def getone(snmpDispatcher, hostname):
        iterator = await get_cmd(
            snmpDispatcher,
            CommunityData("public"),
            await UdpTransportTarget.create(hostname),
            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]))

    async def main():
        with SnmpDispatcher() as snmpDispatcher:
            await asyncio.gather(
                getone(snmpDispatcher, ("demo.pysnmp.com", 161)),
                getone(snmpDispatcher, ("demo.pysnmp.com", 161)),
                getone(snmpDispatcher, ("demo.pysnmp.com", 161)),
            )

    asyncio.run(main())

`Download` script.

## Sequential queries

Send multiple SNMP GET requests one by one using the following options:

- with SNMPv2c, community ‘public’

- over IPv4/UDP

- to multiple Agents at demo.pysnmp.com

- for instance of SNMPv2-MIB::sysDescr.0 MIB object

- based on asyncio I/O framework

Functionally similar to:

$ snmpget -v2c -c public demo.pysnmp.com:161 SNMPv2-MIB::sysDescr.0
$ snmpget -v2c -c public demo.pysnmp.com:161 SNMPv2-MIB::sysDescr.0
$ snmpget -v2c -c public demo.pysnmp.com:161 SNMPv2-MIB::sysDescr.0

    import asyncio
    from pysnmp.hlapi.v1arch.asyncio import *

    async def getone(snmpDispatcher, hostname):
        iterator = await get_cmd(
            snmpDispatcher,
            CommunityData("public"),
            await UdpTransportTarget.create(hostname),
            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]))

    async def getall(snmpDispatcher, hostnames):
        for hostname in hostnames:
            await getone(snmpDispatcher, hostname)

    with SnmpDispatcher() as snmpDispatcher:
        asyncio.run(
            getall(
                snmpDispatcher,
                [
                    ("demo.pysnmp.com", 161),
                    ("demo.pysnmp.com", 161),
                    ("demo.pysnmp.com", 161),
                ],
            )
        )

`Download` script.

See also: library reference.

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