# 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:1161 SNMPv2-MIB::sysDescr.0
$ snmpget -v2c -c public demo.pysnmp.com:2161 SNMPv2-MIB::sysDescr.0
$ snmpget -v2c -c public demo.pysnmp.com:3161 SNMPv2-MIB::sysDescr.0

    import asyncio
    from pysnmp.hlapi.asyncio import *

    async def getone(snmpEngine, hostname):
        get_result = await getCmd(
            snmpEngine,
            CommunityData("public"),
            UdpTransportTarget(hostname),
            ContextData(),
            ObjectType(ObjectIdentity("SNMPv2-MIB", "sysDescr", 0)),
        )

        errorIndication, errorStatus, errorIndex, varBinds = await get_result
        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():
        snmpEngine = SnmpEngine()
        await asyncio.gather(
            getone(snmpEngine, ('demo.pysnmp.com', 1161)),
            getone(snmpEngine, ('demo.pysnmp.com', 2161)),
            getone(snmpEngine, ('demo.pysnmp.com', 3161)),
        )

    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:1161 SNMPv2-MIB::sysDescr.0
$ snmpget -v2c -c public demo.pysnmp.com:2161 SNMPv2-MIB::sysDescr.0
$ snmpget -v2c -c public demo.pysnmp.com:3161 SNMPv2-MIB::sysDescr.0

    import asyncio
    from pysnmp.hlapi.asyncio import *

    async def getone(snmpEngine, hostname):
        result_get = await getCmd(
            snmpEngine,
            CommunityData("public"),
            UdpTransportTarget(hostname),
            ContextData(),
            ObjectType(ObjectIdentity("SNMPv2-MIB", "sysDescr", 0)),
        )

        errorIndication, errorStatus, errorIndex, varBinds = await result_get
        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(snmpEngine, hostnames):
        for hostname in hostnames:
            await getone(snmpEngine, hostname)

    snmpEngine = SnmpEngine()

    asyncio.run(
        getall(snmpEngine, [('demo.pysnmp.com', 1161), ('demo.pysnmp.com', 2161), ('demo.pysnmp.com', 3161)])
    )

`Download` script.

See also: library reference.