I would like to create proper error handling for the PySNMP function nextCmd() and am curious what the parameters errorIndication, errorStatus, and errorIndex are providing as I iterate through nextCmd().
I can not find anything within the documentation regarding these variables and would like to know more.
You can think of errorIndication as locally occurred errors. Misconfiguration or timeout will be reported via it.
The errorStatus and errorIndex pair can only come from the remote SNMP entity - that's the way how SNMP peers communicate their failures to us. Any non-zero errorStatus means an (enumerated) error. The accompanying errorIndex point to the first variable-binding in the request which might have caused the processing error being reported.