asking for help, what's the right way to query multiple remote host without the trouble I meet

[Storm-Born]

1. so, there are 10 hosts with the same authentication configuration. In a loop I query each of them with the async api and responses seem to be ok.
2. what's werid me is that when I give a wrong authPass to a host in the loop, it also respond the value instead of telling me wrong pdu digest.
3. if there is only one host, I give a wrong authPass to query something, it will respond the wrong pdu digest as I wish.
   4.I have tryed the multiple snmp engine demo,but it's not ok.
4. so what's the right way to use the api for concurrent query multiple hosts.

[etingof]

This is weird. Can you share the code snippet that exhibits this behavior?

Generally, this example might do the job upon some adjustment.

[Storm-Born]

`def cbFun(snmpEngine, sendRequestHandle, errorIndication,
errorStatus, errorIndex, varBinds, cbCtx):
if errorIndication:
print(errorIndication)
return
elif errorStatus:
print('%s at %s' % (errorStatus.prettyPrint(),
errorIndex and varBindTable[-1][int(errorIndex) - 1][0] or '?'))
return
else:
for varBind in varBinds:
print('%s %s %s'%( cbCtx['host'], cbCtx['pwd'], ' = '.join([x.prettyPrint() for x in varBind])))

snmpEngine = SnmpEngine()

hosts = ['node-a','node-b','node-c','node-d']

for host in hosts:
auth_pass = 'root@123'
# if host == 'node-d':
# auth_pass = 'root@125'
# print(auth_pass)
getCmd(snmpEngine,
UsmUserData('root', auth_pass ,'root@123', authProtocol=usmHMACSHAAuthProtocol, privProtocol=usmAesCfb128Protocol),
UdpTransportTarget((host, 161)),
ContextData(),
ObjectType(ObjectIdentity('1.3.6.1.2.1.1.3.0')),
cbFun=cbFun,
cbCtx={'host':host,'pwd':auth_pass})

snmpEngine.transportDispatcher.runDispatcher()`

=================================================================
running result:
node-a root@123 SNMPv2-MIB::sysUpTime.0 = 485832
node-b root@123 SNMPv2-MIB::sysUpTime.0 = 460159
node-c root@123 SNMPv2-MIB::sysUpTime.0 = 445637
node-d root@123 SNMPv2-MIB::sysUpTime.0 = 415837

when modify the auth_pass of node-d, I can also get the sysUptime
node-b root@123 SNMPv2-MIB::sysUpTime.0 = 475118
node-a root@123 SNMPv2-MIB::sysUpTime.0 = 500792
node-d root@125 SNMPv2-MIB::sysUpTime.0 = 430795
node-c root@123 SNMPv2-MIB::sysUpTime.0 = 460599

then I remove other items in hosts,only node-d left.as:
hosts = ['node-d']
the runing result is:

root@125
Wrong SNMP PDU digest

===================================================================
another test code list below, also respond a targetValue when give a wrong auth_pass to node-d.
I use the getCmd method instead of nextCmd method given in the online example.

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

targets = (

# 3-nd target (SNMPv3 over IPv4/UDP)
(UsmUserData('root', 'root@123'  ,'root@123', authProtocol=usmHMACSHAAuthProtocol, privProtocol=usmAesCfb128Protocol),
 UdpTransportTarget(('node-a', 161)),
 (ObjectType(ObjectIdentity('1.3.6.1.2.1.1.3.0')),)),

 (UsmUserData('root', 'root@124'  ,'root@123', authProtocol=usmHMACSHAAuthProtocol, privProtocol=usmAesCfb128Protocol),
 UdpTransportTarget(('node-b', 161)),
 (ObjectType(ObjectIdentity('1.3.6.1.2.1.1.3.0')),)),

 (UsmUserData('root', 'root@123'  ,'root@123', authProtocol=usmHMACSHAAuthProtocol, privProtocol=usmAesCfb128Protocol),
 UdpTransportTarget(('node-c', 161)),
 (ObjectType(ObjectIdentity('1.3.6.1.2.1.1.3.0')),)),

 (UsmUserData('root', 'root@123'  ,'root@123', authProtocol=usmHMACSHAAuthProtocol, privProtocol=usmAesCfb128Protocol),
 UdpTransportTarget(('node-d', 161)),
 (ObjectType(ObjectIdentity('1.3.6.1.2.1.1.3.0')),)),

)

snmpEngine = SnmpEngine()

Submit initial GETNEXT requests and wait for responses

for authData, transportTarget, varBinds in targets:
getCmd(snmpEngine, authData, transportTarget, ContextData(),
*varBinds, **dict(cbFun=cbFun, cbCtx=(authData, transportTarget)))

snmpEngine.transportDispatcher.runDispatcher()

===================RESULT==========================================
UsmUserData(userName='root', authKey=, privKey=, authProtocol=(1, 3, 6, 1, 6, 3, 10, 1, 1, 3), privProtocol=(1, 3, 6, 1, 6, 3, 10, 1, 2, 4), securityEngineId='', securityName='root', authKeyType=0, privKeyType=0) UdpTransportTarget(('172.16.227.11', 161), timeout=1, retries=5, tagList='') SNMPv2-MIB::sysUpTime.0 = 546353
UsmUserData(userName='root', authKey=, privKey=, authProtocol=(1, 3, 6, 1, 6, 3, 10, 1, 1, 3), privProtocol=(1, 3, 6, 1, 6, 3, 10, 1, 2, 4), securityEngineId='', securityName='root', authKeyType=0, privKeyType=0) UdpTransportTarget(('172.16.227.12', 161), timeout=1, retries=5, tagList='') SNMPv2-MIB::sysUpTime.0 = 520680
UsmUserData(userName='root', authKey=, privKey=, authProtocol=(1, 3, 6, 1, 6, 3, 10, 1, 1, 3), privProtocol=(1, 3, 6, 1, 6, 3, 10, 1, 2, 4), securityEngineId='', securityName='root', authKeyType=0, privKeyType=0) UdpTransportTarget(('172.16.227.14', 161), timeout=1, retries=5, tagList='') SNMPv2-MIB::sysUpTime.0 = 476357
UsmUserData(userName='root', authKey=, privKey=, authProtocol=(1, 3, 6, 1, 6, 3, 10, 1, 1, 3), privProtocol=(1, 3, 6, 1, 6, 3, 10, 1, 2, 4), securityEngineId='', securityName='root', authKeyType=0, privKeyType=0) UdpTransportTarget(('172.16.227.13', 161), timeout=1, retries=5, tagList='') SNMPv2-MIB::sysUpTime.0 = 506161

[Storm-Born]

Can You help me for this problem, or what's the correct way to reach the thing that I want to do.