BUG: SNMPv3 requests not works with Mikrotik RouterOS devices

[aversant]

Describe the issue:

With Mikrotic Router OS devices SNMPv3 request not worked - "Timeout Error", but with snmpget utility works.

Check request with tcpdump -vvvv:
gufoSNMP:

{ SNMPv3 { F=apr } { USM B=0 T=0 U="Network" } { ScopedPDU [!scoped PDU]d3_a9_14_37_52_01_11_f6_7b_9f_15_6a_b9_74_ff_80_35_be_2c_ad_f3_36_33_dc_2d_b6_ec_f4_ff_ed_83_21} }

<TIMEOUT>

snmpget

{ SNMPv3 { F=r } { USM B=0 T=0 U="" } { ScopedPDU E= C="" { GetRequest(14) R=1125633915  } } }

Response:
{ SNMPv3 { F=r } { USM B=0 T=0 U="" } { ScopedPDU E=_80_00_3a_8c_04 C="" { Report(32) R=1125633915  S:snmpUsmMIB.usmMIBObjects.usmStats.usmStatsUnknownEngineIDs.0=3754 } } }

Reproduce the code example:

from gufo.snmp.sync_client import SnmpSession
from gufo.snmp.user import User, Aes128Key, DesKey, Md5Key, Sha1Key, KeyType

u = User(name="Network", auth_key=Sha1Key("XXXX".encode()), key_type=KeyType.Password), priv_key=Aes128Key("YYYYY".encode(),  key_type=KeyType.Password))

s = SnmpSession(user=u, addr="172.16.20.20", timeout=3, version=SnmpVersion.v3)
s.refresh()

Error message:

No response

Python version information

3.11.6 (main, Jan 6 2024, 05:32:16) [GCC 10.2.1 20210110]

Gufo SNMP version information

0.5.1

Operation system version

cat /etc/debian_version
11.8

[dvolodin7]

Fixed in 0.6.0