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51 bytes. 15 miles. zero infrastructure.

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Open binary codec standards for structured IoT messaging over Meshtastic LoRa mesh networks. When the cell towers fail, the mesh keeps talking.

[ start free ] [ 5-min quickstart ]

v1.0 EMRG active · 10 standards drafting · published specifications · reference codec maintained by aSTDz

the problem

── when infrastructure fails ──────────────────────────────

Hurricane takes out the cell towers. Wildfire melts the fiber. Earthquake levels the substation. The grid you depend on for "send a text" is the same grid that fails first when you need it most.

First responders fall back to voice radio. Voice is slow, error-prone, and impossible to log. There is no structured way to push "medical emergency, lat 39.97, severity 4, two units en route" across a city without internet.

┌──────────────────────────────┐
│  cell tower    DOWN          │
│  fiber backhaul  DOWN        │
│  internet       DOWN         │
│  power grid     DOWN         │
│  ─────────────────────       │
│  voice radio    OK (slow)    │
│  text message   ???          │
│  structured data ???         │
└──────────────────────────────┘

the solution

── 51 bytes can save a city ───────────────────────────────

aSTDz is a family of 11 binary codec standards that compress domain-specific IoT data into payloads small enough to ride a single LoRa packet across 2-15 miles of mesh network. No internet. No cell tower. No subscription.

aSTDz defines the standards. The codec is the reference implementation. Certified transmitters ensure every alert on the mesh is accountable. Receivers decode for free, forever — adoption is open, modification is not.

structured

every byte has a documented meaning. no parsing free text.

compact

51, 115, or 222 bytes. sized to LoRa airtime budgets.

offline

receivers decode without internet. mesh routes itself.

by the numbers

── tiers · range · cost ───────────────────────────────────

bytes · NANO tier

115

bytes · MICRO tier

222

bytes · FULL tier

miles single hop

pre-built EMRG messages

standards in the family

$35

per node hardware

monthly fees · ever

∞

decoders, free forever

three ways to use it

── pick your integration ──────────────────────────────────

› web dashboard

encode, decode, search the message library, manage devices and certs. no install.

app.astdz.com →

› REST API

programmatic encode/decode/validate. drop into your firmware build pipeline or backend.

API reference →

› @astdz/codec

pure typescript codec library. embed in node, browser, or edge runtimes. zero deps.

codec docs →

the standards family

── 11 standards · 1 architecture ──────────────────────────

One tier system. One CRC. One envelope. Eleven domains.

code	name	domain	status
EMRG	Emergency Communications	public safety	v1.0 active
POLI	Law Enforcement	police / BOLO	drafting
ENRG	Energy / Grid	substation telemetry	drafting
H2OQ	Water Quality	watershed sensors	drafting
TRAX	Asset Tracking	fleet / logistics	drafting
AGRO	Agriculture / Soil	field sensors	drafting
STRX	Structural Monitoring	bridges / buildings	drafting
MEDI	Medical Telemetry	patient vitals	drafting
COLD	Cold Chain Logistics	refrigerated shipping	drafting
ATMO	Air Quality	PM2.5 / AQI	drafting
WTHR	Weather Reporting	weather stations	drafting

features

── click to expand ────────────────────────────────────────

› binary codec, 3 tiers

NANO 51 bytes for the smallest LoRa airtime budget. MICRO 115 bytes for typical alerts with GPS and free text. FULL 222 bytes for rich payloads with resource assignments and incident metadata. Auto-tier selection picks the smallest tier that fits your data.

› CRC16-CCITT integrity

Every payload is signed with CRC16-CCITT (poly 0x1021, init 0xFFFF). Receivers reject corrupted packets without ambiguity. No silent data loss across long mesh routes.

› Big Endian, WGS84, SI units

No regional ambiguity. GPS as int32 micro-degrees, WGS84 datum. All measurements in SI / metric. Sentinel values for "no reading" so absent data round-trips losslessly.

› 60 pre-built EMRG messages

Structure fire. Cardiac arrest. Active shooter. Hazmat spill. Sixty common emergencies pre-encoded with a 16-bit reference so transmitters send 2 bytes and receivers expand the full text locally.

› self-service certification

Test certs issue instantly, last 30 days, one renewal. Production certs are free during beta and last 60 days with unlimited renewals. No sales call. No procurement.

› REST API on Cloudflare Workers

Encode, decode, validate, message search, device registration, certs. Sub-100ms cold start. Bearer-token auth. Per-key rate limiting. Zod-validated, parameter-bound D1 queries.

› web dashboard with byte inspector

Decode any payload and watch every byte highlight as you mouse over the field tree. Encode forms know the schema and auto-pick tiers. Real ASCII monospace, JetBrains Mono, no chrome.

› @astdz/codec library

Pure TypeScript. Zero runtime dependencies. Works in node, browser, Cloudflare Workers, Deno, Bun. Embed it in your firmware build, your dashboard, your test harness — same encoder everywhere.

› Meshtastic native

Sized to fit Meshtastic SF7-12 packet budgets. Works with the existing channel system. No fork required. Set up a node, point it at the right channel, transmit.

› fastalert.now bridge

Optional mesh-to-IP gateway. Receive an EMRG payload off the mesh, push it to webhook, SMS, email, or any IP-side alert channel. The mesh stays trusted; the gateway is the only place internet matters.

› MCP integration · live

Give Claude direct tools to encode, decode, search, simulate, and analyze EMRG payloads. Ask the model "decode this hex" or "build a structure-fire alert at these coordinates" and it produces wire-ready bytes. Connect from Claude Desktop, Claude Code, or any MCP-compatible client using your existing aSTDz API key — the MCP server is a stateless proxy, so the same key, tier, and rate limit apply.

› published specifications, reference codec

aSTDz publishes the specifications and maintains the reference codec. Implementations must conform to the published spec to interoperate on the mesh — the standards are open for adoption, not modification. Receivers decode without permission and never expire. Transmitters are certified by aSTDz so every alert on the air is traceable to an accountable source.

field decoder

── pwa · install on any phone ─────────────────────────────

The aSTDz field decoder is a progressive web app. Open it once on any phone, install to home screen, and it works offline forever. Paste hex, see the decoded payload. No account. No login.

This is the receiver side of the trust model. Anyone, anywhere, can verify and read aSTDz traffic at zero cost.

[ open decoder → ]

┌─ EMRG TIER 0 · NANO ─────────┐
│ event:   structure fire      │
│ severity: 4 critical         │
│ status:  01 new              │
│ gps:     39.978, -86.118     │
│ device:  0x000001            │
│ crc:     ✓ valid             │
└──────────────────────────────┘

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51 bytes can save a city.

Free during beta. Test cert in 60 seconds. No credit card. No sales call.

[ create your account ] [ read the docs ]

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