MEL

system architecture

Architecture

Where truth lives, how evidence flows, and what MEL deliberately does not pretend to know.

Truth hierarchy

MEL's evidence model is explicit about source authority. Lower layers never override higher ones.

  1. ①
    Runtime evidencecanonical

    Typed deterministic records: ingest records, state transitions, audit events. Always wins on conflict.

  2. ②
    Bounded calculatorsdeterministic

    Heuristics and derived values with explicit inputs and documented uncertainty bounds.

  3. ③
    Assistive inferencelabeled

    AI assistance labeled non-canonical when present. Never overrides deterministic layers.

  4. ④
    Narrative and UI copyfollows

    Must not contradict layers above. Narrative follows evidence — not the reverse.

Full detail: Architecture overview (docs) · Architecture truth (product)

Component map

High-level runtime structure. Each layer has explicit boundaries and documented ingest constraints.

entry point

CLI / Daemon

cmd/mel — init, doctor, serve, demo, operator commands. Single binary entry point.

persistence

SQLite Store

Local operational database. All evidence, incidents, and audit events. Freshness is explicit.

transport

Ingest Workers

Serial/TCP/MQTT paths. Unsupported paths (BLE, HTTP ingest) stay labeled — no implied support.

api layer

Runtime API

REST API serves embedded console and external clients. /healthz, /readyz, /api/v1/status.

surface

Embedded Console

React+Vite UI compiled into internal/web/assets/. Served by mel serve — not this site.

Folder-level map for contributors: ARCHITECTURE_MAP.md

Transport and control boundaries

MEL observes what ingest and configuration make visible. It does not implement mesh RF routing as a product feature, and it does notcollapse degraded or unknown posture into “all green.”

Control paths separate submission, approval, dispatch, execution result, and audit — each is a distinct state with attribution. See Trust & privacy and the docs on control-plane trust.

Operational boundaries

  • MEL is not the RF routing stack — it persists evidence from what your ingest workers connect.
  • MEL does not claim RF coverage, mesh delivery, or propagation proof.
  • BLE ingest and HTTP ingest are unsupported — labels remain in UI and docs.
  • Assistive AI output is non-canonical — deterministic layers always win conflicts.
shell — open deep docs
git clone https://github.com/Hardonian/MEL-MeshEdgeLayer.git
cd MEL-MeshEdgeLayer && ls docs/architecture/