Epson Proxy/Simulator Notes

This repo contains a minimal Epson SNMP/discovery simulator and a UDP proxy that forwards to a real printer.

Files

• epson_sim.py — SNMPv1 + Epson discovery simulator.
• epson_proxy.py — UDP proxy for SNMP (161) and Epson discovery (3289).
• logs/ — runtime logs and learned OID maps (created at runtime).

Simulator

Run:

py .\epson_sim.py

Defaults:

• SNMP: UDP 161
• Discovery: UDP 3289
• Logs: logs/epson_sim-YYYYMMDD-HHMMSS.log

Proxy

Run (defaults to --target-ip 192.168.55.211):

py .\epson_proxy.py

Options:

• --target-ip <ip>: real printer IP.
• --mac <AA:BB:CC:DD:EE:FF>: override MAC in SNMP responses.
• --learn-file <path>: write OID→HEX mapping to a custom file.
• --no-learn-merge: append with timestamps instead of deduped map.

Logs (created at runtime):

• logs/epson_proxy-YYYYMMDD-HHMMSS.log — request/response log.
• logs/epson_proxy-learn-YYYYMMDD-HHMMSS.log — learned OID map (dedup by default).

Replay

Replays discovery + SNMP GETs based on a learn map:

py .\replay_traffic.py --learn-file .\logs\epson_proxy-learn-YYYYMMDD-HHMMSS.log