Three ways home for field firmware
Why a browser flasher, UF2 fallback, and explicit bootloader path are one recovery system rather than redundant conveniences.
Firmware / Embedded · PRJ-2424
RatTunnel Field Transport
A remote node is only as good as its recovery path. RatTunnel treats update safety, identity, observability, and radio behavior as first-class product features.
SYSTEM PLATE / PRJ-2424STATUS / Firmware v1.0.33
200stored routes
03update paths
08swatchdog
Problem
Problem and constraints
Field firmware has to survive poor links, duplicate traffic, abrupt power loss, and operator mistakes while remaining serviceable without a specialized development setup.
Engineering approachArchitecture and implementation
A bounded route table, duplicate suppression, watchdog recovery, persistent runtime settings, and three update paths make the node legible and recoverable. A browser flasher exposes configuration without hiding the radio details.
Transport
Reticulum-compatible announcements, learned routes, forwarding, and jittered relay queues.
Security
X25519 and Ed25519 peer messaging plus an optional ephemeral-identity boot mode.
Recovery
Web flasher, UF2 fallback, watchdog, diagnostics, and explicit bootloader entry.
Supporting notes
Technical decisions in more detail.
Related writeups document implementation patterns, tradeoffs, and recovery considerations from this work.
Repository
Code and implementation record.
Public repository metadata and source are included where the project is available for review.
Related work
Discuss the project