Fetch one or more OIDs in a single SNMP GET-Request. Accepts numeric (e.g. 1.3.6.1.2.1.1.5.0) and a small set of symbolic forms (e.g. SNMPv2-MIB::sysName.0). Returns a dict keyed by OID with {value, type} per varbind.

Walk an OID subtree via GETNEXT chain. Terminates on endOfMibView or when the next OID leaves the subtree. Returns a list of {oid, value, type} rows.

Walk an OID subtree via GETBULK (SNMPv2c+). Faster than snmp_walk for large tables; falls back to GETNEXT with a warning on v1 hosts. max_repetitions defaults to 25.

Walk and tabularize an SNMP table. Returns {table_oid, rows: [{index, : value, ...}, ...]}. Column-name mapping is best-effort: unknown columns are keyed by numeric OID.

Fetch the SNMPv2-MIB::system group (RFC 3418): sysDescr, sysObjectID, sysUpTime (centiseconds and seconds), sysContact, sysName, sysLocation, sysServices.

List network interfaces via IF-MIB (RFC 2863). Merges ifTable + ifXTable per ifIndex. HC counters (ifHCInOctets / ifHCOutOctets) are returned alongside 32-bit counters. ifSpeed saturation at ~4.29 Gbps is handled automatically — ifSpeed_bps falls back to ifHighSpeed*1e6 with ifSpeed_source='ifHighSpeed' and a warning.

HOST-RESOURCES-MIB (RFC 2790) summary: CPU load per core (hrProcessorLoad), memory (hrMemorySize + derived swap), uptime, process count, and storage table (filesystems + RAM + swap). Raises 'unsupported' if the agent does not implement the MIB at all (typical on bare network switches).

PRINTER-MIB (RFC 3805) status: supplies (toner / ink / drum levels with percent computed when capacity is known), input trays, output bins, and active alerts. Works across HP, Brother, Canon, OKI, Epson, Lexmark. Sentinel values (-2 unknown, -3 not measured) are handled per RFC 3805.

Probe which standard MIBs a device implements. Issues 5 GETs (sysObjectID, sysDescr, ifNumber, hrSystemUptime, prtGeneralPrinterStatus.1.1) and reports a vendor hint (decoded from the sysObjectID enterprise number) plus a list of supported_mibs. Useful as a smoke test before calling heavier tools.