Thoughts on how this SNMP sensor works?

Configuration
1

Canon printer. I had it working and then it partly broke. Or the “Status” broke. every other OID value worked. I got it working again but not sure it’s right. Rather have it right than just kind of working. So here’s the deal.

This is what I had:

- platform: snmp
  name: Canon MF8580CDW Status
  host: 192.168.0.6
  baseoid: 1.3.6.1.2.1.25.3.5.1.2.1
  accept_errors: true
  scan_interval: 1000
  value_template: >-
   {% if value|int(base=16) is equalto 0 %} <- After value_template
      OK
    {% else %}
      Failed
    {% endif %}

So it would return OK when the printer was fine but now errors out. I changed it to:

- platform: snmp
  name: Canon MF8580CDW Status
  host: 192.168.0.6
  baseoid: 1.3.6.1.2.1.25.3.5.1.2.1
  accept_errors: true
  scan_interval: 1000
  value_template: >
    {% if value == "" or value == null or value == " " %}
      OK
    {% else %}
      Failed
    {% endif %}

and it returns that it’s good and Failed if I like pull the paper try out. So you are like what’s the problem? Well in Windows I run snmpget and get:

snmpget -r:192.168.0.6 -t:10 -o:.1.3.6.1.2.1.25.3.5.1.2.1
SnmpGet v1.01 - Copyright (C) 2009 SnmpSoft Company
[ More useful network tools on http://www.snmpsoft.com ]

OID=.1.3.6.1.2.1.25.3.5.1.2.1
Type=OctetString
Value=

So it’s an OctetString and according to this website:

If that OID is all good and there are no printer issues it’s returns blank.

That said for my “working” value_template only one of those three options that work is the space between the quotes. So it’s “blank” when there is a space which I’m not sure is what they mean by blank. When it errors like if the paper tray is out I get back A0. What is the correct way to be dealing with this hardware and SNMP output?