Open SSH and Putty in to your device. Then
esxcli system snmp set -r
esxcli system snmp set -c <community.name.you.want>
esxcli system snmp set -p 161
esxcli system snmp set -L "<City>,<Country>"
esxcli system snmp set -C <noc@example.com>
esxcli system snmp set -e yes
Now start the SNMP service through the UI and you are done.
Connect with SNMP V2.