Help with snmp v3 Configuration

Third party integrations
1

Hi, this is my first post because i can’t find any solutions.
I’m trying to read some snmp values from my router.
I can run snmpwalk from my Desktop without any error:

C:\Users\\Desktop\SnmpWalk>SnmpWalk.exe -r:"192.168.1.1" 
-v:3 -sn:"ha" -ap:"md5" -aw:"ha2024auth"
-pp:"AES256" -pw:"ha2024enc" 
-os:"1.3.6.1.4.1.2356.11.1.75.36" -op:"1.3.6.1.4.1.2356.11.1.75.37"
SnmpWalk v1.01 - Copyright (C) 2009 SnmpSoft Company
[ More useful network tools on http://www.snmpsoft.com ]

OID=.1.3.6.1.4.1.2356.11.1.75.36.0, Type=Integer, Value=68130
Total: 1

my ha config looks like this:

- platform: snmp
  name: Lancom-Router
  host: 192.168.1.1
  version: "3"
  username: "ha"
  auth_key: "ha2024auth"
  auth_protocol: "hmac-md5"
  priv_key: "ha2024enc"
  priv_protocol: "aes-cfb-256"
  baseoid: 1.3.6.1.4.1.2356.11.1.75.36
  accept_errors: true
  default_value: "10000"

I always get the default value and a timeout in the logs

2024-11-11 16:34:02.274 WARNING (MainThread) [homeassistant.components.sensor] Setup of sensor platform snmp is taking over 10 seconds.
2024-11-11 16:34:41.526 ERROR (MainThread) [homeassistant.components.snmp.sensor] Please check the details in the configuration file: No SNMP response received before timeout

I think I’m missing something and maybe someone can kindly help me

//Edit: If i switch to SNMP v2c everything works.

2

Are you sure snmpv3 is active on the device?

3

I’m pretty sure. Because i used snmpwalk and also snmpget with the v3 Paramter.

4

If the OID works with v2c then that is correct, so it must be something with the login credentials and authentication that is wrong.

5

The strange thing is, that everything works fine with tools like snmpget or snmpwalk.
I kind of surrendered and changed my config to snmpv2c. Do you know if i have to restart the whole homeassistant to reload the snmp configuration or is there a faster way?

6

If it works with other apps, then it is an incompatibility with v3 and Home Assistant.
Have you checked your settings with the HA documentation.
I use SNMP in Node Red, so I am not that much into HAs implementation.

7

Thank you for helping me. I do not have much experience with snmpv3. Configuring it over config files and then reloading the whole system is to much trial and error for me.
i think i will stay with v2c for now. maybe there are some compatibility problems with my device and the snmpv3 implementation of homeassistant. On my router side i get this error: “Couldn’t parse SNMP Message”

8