EVO supports SNMP version 2c, the community string is "public", and the default port is 162.
The EVO MIB file can be found on EVO at: http://<EVO-IP-ADDRESS>/download/EVO-MIB.txt
There is also a link to the MIB file on the System > Remote Monitoring page. EVO does not generate traps for specific events, but EVO can be polled on a regular basis for information.
When polling EVO, the response will contain the Object Identifier (OID). These identifiers may vary from system to system, but it should be possible to use snmpwalk to find each OID, and which string each ID references. For example, if the IP address to the EVO is 192.168.1.25, the following command can be used:
snmpwalk -v2c -cpublic 192.168.1.25 1
Here is an example output:
iso.3.6.1.2.1.1.2.0 = OID: iso.3.6.1.4.1.23599.2
iso.3.6.1.4.1.23599.2.1 = STRING: "5.8.1.84"
iso.3.6.1.4.1.23599.2.2 = STRING: "Thu Aug 10 15:39:13 UTC 2017"
iso.3.6.1.4.1.23599.2.3.1 = INTEGER: 684028
iso.3.6.1.4.1.23599.2.3.2 = STRING: "7 day(s), 22:00:28"
iso.3.6.1.4.1.23599.2.4 = STRING: "1467.76"
iso.3.6.1.4.1.23599.2.5.1 = ""
iso.3.6.1.4.1.23599.2.5.2 = STRING: "disabled"
iso.3.6.1.4.1.23599.2.5.3 = STRING: "disabled"
iso.3.6.1.4.1.23599.2.5.4 = INTEGER: 75
iso.3.6.1.4.1.23599.2.5.5 = INTEGER: 0
iso.3.6.1.4.1.23599.2.5.6 = STRING: "online"
iso.3.6.1.4.1.23599.2.5.7 = INTEGER: 0
iso.3.6.1.4.1.23599.2.5.8 = STRING: "1"
iso.3.6.1.4.1.23599.2.6.1 = Counter32: 1419771
iso.3.6.1.4.1.23599.2.6.2 = Counter32: 14084719
iso.3.6.1.4.1.23599.2.7.1.1.1 = INTEGER: 1
iso.3.6.1.4.1.23599.2.7.1.1.2 = INTEGER: 2
iso.3.6.1.4.1.23599.2.7.1.1.3 = INTEGER: 3
iso.3.6.1.4.1.23599.2.7.1.1.4 = INTEGER: 4
iso.3.6.1.4.1.23599.2.7.1.1.5 = INTEGER: 5
iso.3.6.1.4.1.23599.2.7.1.1.6 = INTEGER: 6
iso.3.6.1.4.1.23599.2.7.1.1.7 = INTEGER: 7
iso.3.6.1.4.1.23599.2.7.1.1.8 = INTEGER: 8
iso.3.6.1.4.1.23599.2.7.1.2.1 = STRING: "quad-0/drive-0"
iso.3.6.1.4.1.23599.2.7.1.2.2 = STRING: "quad-0/drive-1"
iso.3.6.1.4.1.23599.2.7.1.2.3 = STRING: "quad-0/drive-2"
iso.3.6.1.4.1.23599.2.7.1.2.4 = STRING: "quad-0/drive-3"
iso.3.6.1.4.1.23599.2.7.1.2.5 = STRING: "quad-1/drive-0"
iso.3.6.1.4.1.23599.2.7.1.2.6 = STRING: "quad-1/drive-1"
iso.3.6.1.4.1.23599.2.7.1.2.7 = STRING: "quad-1/drive-2"
iso.3.6.1.4.1.23599.2.7.1.2.8 = STRING: "quad-1/drive-3"
iso.3.6.1.4.1.23599.2.7.1.3.1 = Counter32: 144276
iso.3.6.1.4.1.23599.2.7.1.3.2 = Counter32: 145389
iso.3.6.1.4.1.23599.2.7.1.3.3 = Counter32: 144065
iso.3.6.1.4.1.23599.2.7.1.3.4 = Counter32: 143479
iso.3.6.1.4.1.23599.2.7.1.3.5 = Counter32: 137746
iso.3.6.1.4.1.23599.2.7.1.3.6 = Counter32: 141215
iso.3.6.1.4.1.23599.2.7.1.3.7 = Counter32: 141794
iso.3.6.1.4.1.23599.2.7.1.3.8 = Counter32: 147072
iso.3.6.1.4.1.23599.2.7.1.4.1 = Counter32: 464760
iso.3.6.1.4.1.23599.2.7.1.4.2 = Counter32: 726491
iso.3.6.1.4.1.23599.2.7.1.4.3 = Counter32: 465559
iso.3.6.1.4.1.23599.2.7.1.4.4 = Counter32: 466042
iso.3.6.1.4.1.23599.2.7.1.4.5 = Counter32: 464211
iso.3.6.1.4.1.23599.2.7.1.4.6 = Counter32: 469261
iso.3.6.1.4.1.23599.2.7.1.4.7 = Counter32: 466038
iso.3.6.1.4.1.23599.2.7.1.4.8 = Counter32: 467248
iso.3.6.1.4.1.23599.2.9.1.1.1 = INTEGER: 1
iso.3.6.1.4.1.23599.2.9.1.1.2 = INTEGER: 2
iso.3.6.1.4.1.23599.2.9.1.2.1 = STRING: "POOL-A"
iso.3.6.1.4.1.23599.2.9.1.2.2 = STRING: "POOL-A"
iso.3.6.1.4.1.23599.2.9.1.3.1 = STRING: "sanmeupscotty"
iso.3.6.1.4.1.23599.2.9.1.3.2 = STRING: "sharebear"
iso.3.6.1.4.1.23599.2.9.1.4.1 = STRING: "Online"
iso.3.6.1.4.1.23599.2.9.1.4.2 = STRING: "Online"
iso.3.6.1.4.1.23599.2.9.1.5.1 = STRING: "Good"
iso.3.6.1.4.1.23599.2.9.1.5.2 = STRING: "Good"
iso.3.6.1.4.1.23599.2.9.1.6.1 = INTEGER: 16106
iso.3.6.1.4.1.23599.2.9.1.6.2 = INTEGER: 12884901
iso.3.6.1.4.1.23599.2.10.1.1.1 = INTEGER: 1
iso.3.6.1.4.1.23599.2.10.1.1.2 = INTEGER: 2
iso.3.6.1.4.1.23599.2.10.1.1.3 = INTEGER: 3
iso.3.6.1.4.1.23599.2.10.1.2.1 = STRING: "POOL-A"
iso.3.6.1.4.1.23599.2.10.1.2.2 = STRING: "POOL-A"
iso.3.6.1.4.1.23599.2.10.1.2.3 = STRING: "POOL-A"
iso.3.6.1.4.1.23599.2.10.1.3.1 = STRING: "sanmeupscotty"
iso.3.6.1.4.1.23599.2.10.1.3.2 = STRING: "sanmeupscotty"
iso.3.6.1.4.1.23599.2.10.1.3.3 = STRING: "sharebear"
iso.3.6.1.4.1.23599.2.10.1.4.1 = INTEGER: 2
iso.3.6.1.4.1.23599.2.10.1.4.2 = INTEGER: 0
iso.3.6.1.4.1.23599.2.10.1.4.3 = INTEGER: 0
iso.3.6.1.4.1.23599.2.10.1.5.1 = STRING: "online"
iso.3.6.1.4.1.23599.2.10.1.5.2 = STRING: "online"
iso.3.6.1.4.1.23599.2.10.1.5.3 = STRING: "online"
iso.3.6.1.4.1.23599.2.10.1.6.1 = STRING: "209.703"
iso.3.6.1.4.1.23599.2.10.1.6.2 = STRING: "16016.966"
iso.3.6.1.4.1.23599.2.10.1.6.3 = STRING: "12884885.111"
iso.3.6.1.4.1.23599.2.10.1.7.1 = STRING: "unknown"
iso.3.6.1.4.1.23599.2.10.1.7.2 = STRING: "15975.649"
iso.3.6.1.4.1.23599.2.10.1.7.3 = STRING: "12882742.706"
iso.3.6.1.4.1.23599.2.11.1 = STRING: "684031.80"
iso.3.6.1.4.1.23599.2.11.2 = STRING: "8190767.27"
iso.3.6.1.4.1.23599.2.11.3 = INTEGER: 12
End of MIB