Definitely Dahua, see mib file here for baseoid’s.
Hmm, i dont know if mine works or I did something wrong.
See:
- platform: snmp
name: 'NVR Serial #'
host: 192.168.1.99
community: public
version: 2c
baseoid: 1.3.6.1.4.1.1004849.2.1.2.4
accept_errors: true
It looks like your community is “Publico” instead of “public”
hmmmmmmmmmmm
I though that I should not ignore my language writing hahaha
now the message is different…maybe my dvr does not support
It is probably supported, but I think your baseoid might be wrong.
An easy way to find out is using an snmpwalk scanner.
I tried https://www.frameflow.com/free-snmp-browser and worked for me. Just point it to your NVR and you should see something like this:
Nice!!
i was searching all over internet an snmp program, this one seems very easy haha
I am trying to connect here but gettin an Timeout error 
I already tried to open the port 161 on my desktop but same error
*Edit: I made it!
Thanks everyone!
If you’re still not able to get the info from the NVR add (.0) to the end of the baseoid.
For my Hikvision NVR the serial# baseoid is 1.3.6.1.4.1.50001.1.3, and it is configured as below in my yaml.
sensor:
- platform: snmp
name: 'NVR Serial #'
host: 192.168.200.246
community: public
version: 2c
baseoid: 1.3.6.1.4.1.50001.1.3.0
accept_errors: true