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* NextHopRouter: dedup opaque relays to prevent a broadcast storm
Undecryptable ("opaque") frames are relayed by relayOpaquePacket(), which by
design never enters PacketHistory - so unauthenticated frames can't poison
next-hop learning or ACK matching (packet-authenticity policy, d6b12ea3f).
But PacketHistory admission was also the *only* deduplication on that path.
With none, a dense mesh re-relays every copy of every opaque frame and the
copy count multiplies at each hop into an unbounded broadcast storm; "let hop
exhaustion bound it" caps depth, not count.
Add a small, isolated (from,id) seen-set checked in relayOpaquePacket()
before rebroadcast: a second PacketHistory-style table (fixed 32-slot ring,
round-robin eviction) that only suppresses duplicate opaque rebroadcasts and
never feeds routing/ACK/next-hop, preserving the security property. Genuine
originator (re)transmissions (hop_start == hop_limit) are still relayed so
reliable opaque unicast propagates (mirrors FloodingRouter's isRepeated).
Observed on a mixed-channel mesh: one node relayed a single undecryptable
broadcast 23x (every overheard copy) with TX queues saturated, while
decodable traffic on the same node deduped normally.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
* Apply suggestions from code review
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
* Change log level from WARN to TRACE for duplicates
---------
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Meshtastic Firmware
Overview
This repository contains the official device firmware for Meshtastic, an open-source LoRa mesh networking project designed for long-range, low-power communication without relying on internet or cellular infrastructure. The firmware supports various hardware platforms, including ESP32, nRF52, RP2040/RP2350, and Linux-based devices.
Meshtastic enables text messaging, location sharing, and telemetry over a decentralized mesh network, making it ideal for outdoor adventures, emergency preparedness, and remote operations.
Get Started
- 🔧 Building Instructions - Learn how to compile the firmware from source.
- ⚡ Flashing Instructions - Install or update the firmware on your device.
Join our community and help improve Meshtastic! 🚀
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