phosphor-snmp currently only supports sending traps for error log entries. Enabling that for a system can be done by adding phosphor-dbus-monitor rules.
There are a couple of ways through which the user can configure the Dbus-monitor to generate the SNMP trap.
Other OpenBMC applications can still send the SNMP trap as needed. These applications must use the API exposed by the libsnmp.
Users need to add the notification object in the MIB and then application can call the library function.
The OpenBMC Notification management information base (MIB) extension can be found at the following location. It defines the object descriptions needed for a management application to be notified of an error entry in the OpenBMC log.
https://github.com/openbmc/phosphor-snmp/mibs
The phosphor-snmp repository exposes the following lib and the D-Bus service
libsnmp: Exposes the API to send the SNMP trap phosphor-network-snmpconf: Used for configuring the SNMP manager(Client).
The administrator can configure one or more SNMP managers to receive the OpenBMC traps.
curl -c cjar -b cjar -k -H "Content-Type: application/json" -X POST -d '{"data": ["<snmp manager ip>", <port>] }' https://<hostname/ip>/xyz/openbmc_project/network/snmp/manager/action/Client
busctl call xyz.openbmc_project.Network.SNMP /xyz/openbmc_project/network/snmp/manager xyz.openbmc_project.Network.Client.Create Client sqs "<snmp manager ip>" <port>
curl -c cjar -b cjar -k -H "Content-Type: application/json" -X DELETE https://<hostname/ip>/xyz/openbmc_project/network/snmp/manager/<id>
busctl call xyz.openbmc_project.Network.SNMP /xyz/openbmc_project/network/snmp/manager/<id> xyz.openbmc_project.Object.Delete Delete