Manage VMWARE-ENV-MIB

[FedericoCoppola]

Hello,
I have some doubt how to manage the some OID of VMWARE-ENV-MIB.
I have found some of this OID using this link https://kb.vmware.com/servlet/fileFi...ent_1__Body__s

I am interested about this OID:

VMWARE-ENV-MIB vmwESXEnvBatteryAlert notification 1.3.6.1.4.1.6876.4.1.0.303
VMWARE-ENV-MIB vmwESXEnvChassisAlert notification 1.3.6.1.4.1.6876.4.1.0.304
VMWARE-ENV-MIB vmwESXEnvThermalAlert notification 1.3.6.1.4.1.6876.4.1.0.305
VMWARE-ENV-MIB vmwESXEnvDiskAlert notification 1.3.6.1.4.1.6876.4.1.0.306
VMWARE-ENV-MIB vmwESXEnvPowerAlert notification 1.3.6.1.4.1.6876.4.1.0.307
VMWARE-ENV-MIB vmwESXEnvProcessorAlert notification 1.3.6.1.4.1.6876.4.1.0.308
VMWARE-ENV-MIB vmwESXEnvMemoryAlert notification 1.3.6.1.4.1.6876.4.1.0.309
VMWARE-ENV-MIB vmwESXEnvBIOSAlert notification 1.3.6.1.4.1.6876.4.1.0.310

For example I tried to use the first OID (1.3.6.1.4.1.6876.4.1.0.303) and with the snmp version 2c I have this output

snmpwalk -v2c -c community 172.31.109.1 1.3.6.1.4.1.6876.4.1.0.303
iso.3.6.1.4.1.6876.4.1.0.303 = No Such Object available on this agent at this OID

Instead I tried to use the first OID with the snmp version 1 I do not have any output!

Someone can help me?
Thanks
Federico