! vfw01a is the active ASA, addr .201; unique fqdn
! vfw01b is the standby ASA addr .202; unique fqdn

[root@nmis observium]# ./addhost.php csco-vfw01b theCommunity v2c
Trying v2c community  ...
Already got device with SNMP-read sysName (CSCO-VFW01.adomain.com)
Could not reach csco-vfw01b with given SNMP community using v2c
Observium v0.13.8.4386