Reading SNMP V2 OID from ESP8266/ESP32
Not sure if you found it, but there I created an SNMP Manager: https://github.com/shortbloke/Arduino_SNMP_Manager
There is also an SNMP Agent: https://github.com/0neblock/Arduino_SNMP
I know this is a bit later than when you requested this info. But posting here in case it's still helpful to you or others that stumble over this question.