# 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.snmplabs.com

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

- based on asyncio I/O framework

Functionally similar to:

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

    import asyncio
    from pysnmp.hlapi.asyncio import *

    @asyncio.coroutine
    def getone(snmpEngine, hostname):
        errorIndication, errorStatus, errorIndex, varBinds = yield from getCmd(
            snmpEngine,
            CommunityData('public'),
            UdpTransportTarget(hostname),
            ContextData(),
            ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 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]))

    snmpEngine = SnmpEngine()

    loop = asyncio.get_event_loop()
    loop.run_until_complete(
        asyncio.wait([getone(snmpEngine, ('demo.snmplabs.com', 1161)),
                      getone(snmpEngine, ('demo.snmplabs.com', 2161)),
                      getone(snmpEngine, ('demo.snmplabs.com', 3161))])
    )

`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.snmplabs.com

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

- based on asyncio I/O framework

Functionally similar to:

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

    import asyncio
    from pysnmp.hlapi.asyncio import *

    @asyncio.coroutine
    def getone(snmpEngine, hostname):
        errorIndication, errorStatus, errorIndex, varBinds = yield from getCmd(
            snmpEngine,
            CommunityData('public'),
            UdpTransportTarget(hostname),
            ContextData(),
            ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 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]))

    @asyncio.coroutine
    def getall(snmpEngine, hostnames):
        for hostname in hostnames:
            yield from getone(snmpEngine, hostname)

    snmpEngine = SnmpEngine()

    loop = asyncio.get_event_loop()
    loop.run_until_complete(getall(snmpEngine, [('demo.snmplabs.com', 1161),
                                                ('demo.snmplabs.com', 2161),
                                                ('demo.snmplabs.com', 3161)]))

`Download` script.

See also: library reference.