Add support for community MQTT ingest

AGENTS.md

@@ -152,7 +152,8 @@ This message-layer echo/path handling is independent of raw-packet storage dedup
 │   ├── event_handlers.py   # Radio events
 │   ├── decoder.py          # Packet decryption
 │   ├── websocket.py        # Real-time broadcasts
-│   └── mqtt.py             # Optional MQTT publisher
+│   ├── mqtt.py             # Optional MQTT publisher
+│   └── community_mqtt.py   # Community MQTT publisher (raw packet sharing)
 ├── frontend/               # React frontend
 │   ├── AGENTS.md           # Frontend documentation
 │   ├── src/
@@ -233,6 +234,7 @@ Key test files:
 - `tests/test_rx_log_data.py` - on_rx_log_data event handler integration
 - `tests/test_ack_tracking_wiring.py` - DM ACK tracking extraction and wiring
 - `tests/test_health_mqtt_status.py` - Health endpoint MQTT status field
+- `tests/test_community_mqtt.py` - Community MQTT publisher (JWT, packet format, hash, broadcast)
 
 ### Frontend (Vitest)
 
@@ -361,6 +363,17 @@ Optional MQTT integration forwards mesh events to an external broker for home au
 
 **Security**: MQTT password stored in plaintext in SQLite, consistent with the project's trusted-network design.
 
+### Community MQTT Sharing
+
+Separate from private MQTT, the community publisher (`app/community_mqtt.py`) shares raw packets with the MeshCore community aggregator for coverage mapping and analysis. Only raw packets are shared — never decrypted messages.
+
+- Connects to community broker (default `mqtt-us-v1.letsmesh.net:443`) via WebSockets over TLS.
+- Authentication via Ed25519 JWT signed with the radio's private key. Tokens auto-renew before 24h expiry.
+- Broker address field supports `host:port` format (default port 443 if omitted).
+- Topic: `meshcore/{IATA}/{pubkey}/packets` — IATA is a 3-letter region code.
+- JWT `email` claim enables node claiming on the community aggregator.
+- Config: `community_mqtt_enabled`, `community_mqtt_iata`, `community_mqtt_broker`, `community_mqtt_email` in `app_settings`.
+
 ### Server-Side Decryption
 
 The server can decrypt packets using stored keys, both in real-time and for historical packets.
@@ -402,7 +415,7 @@ mc.subscribe(EventType.ACK, handler)
 | `MESHCORE_LOG_LEVEL` | `INFO` | Logging level (`DEBUG`/`INFO`/`WARNING`/`ERROR`) |
 | `MESHCORE_DATABASE_PATH` | `data/meshcore.db` | SQLite database location |
 
-**Note:** Runtime app settings are stored in the database (`app_settings` table), not environment variables. These include `max_radio_contacts`, `auto_decrypt_dm_on_advert`, `sidebar_sort_order`, `advert_interval`, `last_advert_time`, `favorites`, `last_message_times`, `bots`, and all MQTT configuration (`mqtt_broker_host`, `mqtt_broker_port`, `mqtt_username`, `mqtt_password`, `mqtt_use_tls`, `mqtt_tls_insecure`, `mqtt_topic_prefix`, `mqtt_publish_messages`, `mqtt_publish_raw_packets`). They are configured via `GET/PATCH /api/settings` (and related settings endpoints).
+**Note:** Runtime app settings are stored in the database (`app_settings` table), not environment variables. These include `max_radio_contacts`, `auto_decrypt_dm_on_advert`, `sidebar_sort_order`, `advert_interval`, `last_advert_time`, `favorites`, `last_message_times`, `bots`, all MQTT configuration (`mqtt_broker_host`, `mqtt_broker_port`, `mqtt_username`, `mqtt_password`, `mqtt_use_tls`, `mqtt_tls_insecure`, `mqtt_topic_prefix`, `mqtt_publish_messages`, `mqtt_publish_raw_packets`), and community MQTT configuration (`community_mqtt_enabled`, `community_mqtt_iata`, `community_mqtt_broker`, `community_mqtt_email`). They are configured via `GET/PATCH /api/settings` (and related settings endpoints).
 
 Byte-perfect channel retries are user-triggered via `POST /api/messages/channel/{message_id}/resend` and are allowed for 30 seconds after the original send.
 

app/AGENTS.md

@@ -28,6 +28,7 @@ app/
 ├── event_handlers.py    # MeshCore event subscriptions and ACK tracking
 ├── websocket.py         # WS manager + broadcast helpers
 ├── mqtt.py              # Optional MQTT publisher (fire-and-forget forwarding)
+├── community_mqtt.py    # Community MQTT publisher (raw packet sharing)
 ├── bot.py               # Bot execution and outbound bot sends
 ├── dependencies.py      # Shared FastAPI dependency providers
 ├── keystore.py          # Ephemeral private/public key storage for DM decryption
@@ -114,6 +115,20 @@ app/
 - Settings changes trigger `mqtt_publisher.restart()` — no server restart needed.
 - Topics: `{prefix}/dm:{key}`, `{prefix}/gm:{key}`, `{prefix}/raw/dm:{key}`, `{prefix}/raw/gm:{key}`, `{prefix}/raw/unrouted`.
 
+### Community MQTT
+
+- Separate publisher (`app/community_mqtt.py`) for sharing raw packets with the MeshCore community aggregator.
+- Independent from the private `MqttPublisher` — different broker, authentication, and topic structure.
+- Connects to the community broker (default `mqtt-us-v1.letsmesh.net:443`) via WebSockets over TLS.
+- Authentication: Ed25519 JWT tokens signed with the radio's expanded "orlp" private key. Tokens expire after 24 hours; proactive renewal at 23 hours.
+- Broker address supports `host:port` format; defaults to port 443 if omitted.
+- JWT claims include `publicKey`, `owner` (radio pubkey), `client` (app identifier), and optional `email` (for node claiming on the community aggregator).
+- Topic: `meshcore/{IATA}/{pubkey}/packets` — IATA is a 3-letter region code (required to enable; no default).
+- Only raw packets are published — never decrypted messages.
+- Publishes are fire-and-forget. The connection loop detects publish failures via `connected` flag and reconnects within 60 seconds.
+- Health endpoint includes `community_mqtt_status` field.
+- Settings: `community_mqtt_enabled`, `community_mqtt_iata`, `community_mqtt_broker`, `community_mqtt_email`.
+
 ## API Surface (all under `/api`)
 
 ### Health
@@ -222,6 +237,7 @@ Main tables:
 - `bots`
 - `mqtt_broker_host`, `mqtt_broker_port`, `mqtt_username`, `mqtt_password`
 - `mqtt_use_tls`, `mqtt_tls_insecure`, `mqtt_topic_prefix`, `mqtt_publish_messages`, `mqtt_publish_raw_packets`
+- `community_mqtt_enabled`, `community_mqtt_iata`, `community_mqtt_broker`, `community_mqtt_email`
 
 ## Security Posture (intentional)
 
@@ -260,6 +276,7 @@ tests/
 ├── test_message_pagination.py  # Cursor-based message pagination
 ├── test_message_prefix_claim.py # Message prefix claim logic
 ├── test_migrations.py          # Schema migration system
+├── test_community_mqtt.py      # Community MQTT publisher (JWT, packet format, hash, broadcast)
 ├── test_mqtt.py                # MQTT publisher topic routing and lifecycle
 ├── test_packet_pipeline.py     # End-to-end packet processing
 ├── test_packets_router.py      # Packets router endpoints (decrypt, maintenance)

app/community_mqtt.py

@@ -0,0 +1,492 @@
+"""Community MQTT publisher for sharing raw packets with the MeshCore community.
+
+Publishes raw packet data to mqtt-us-v1.letsmesh.net using the protocol
+defined by meshcore-packet-capture (https://github.com/agessaman/meshcore-packet-capture).
+
+Authentication uses Ed25519 JWT tokens signed with the radio's private key.
+This module is independent from the private MqttPublisher in app/mqtt.py.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import base64
+import hashlib
+import json
+import logging
+import re
+import ssl
+import time
+from datetime import datetime
+from typing import Any
+
+import aiomqtt
+import nacl.bindings
+
+from app.models import AppSettings
+
+logger = logging.getLogger(__name__)
+
+_DEFAULT_BROKER = "mqtt-us-v1.letsmesh.net"
+_DEFAULT_PORT = 443  # Community protocol uses WSS on port 443 by default
+_CLIENT_ID = "RemoteTerm (github.com/jkingsman/Remote-Terminal-for-MeshCore)"
+
+# Reconnect backoff: start at 5s, cap at 60s
+_BACKOFF_MIN = 5
+_BACKOFF_MAX = 60
+
+# Proactive JWT renewal: reconnect 1 hour before the 24h token expires
+_TOKEN_LIFETIME = 86400  # 24 hours (must match _generate_jwt_token exp)
+_TOKEN_RENEWAL_THRESHOLD = _TOKEN_LIFETIME - 3600  # 23 hours
+
+# Ed25519 group order
+_L = 2**252 + 27742317777372353535851937790883648493
+_IATA_RE = re.compile(r"^[A-Z]{3}$")
+
+# Route type mapping: bottom 2 bits of first byte
+_ROUTE_MAP = {0: "F", 1: "F", 2: "D", 3: "T"}
+
+
+def _parse_broker_address(broker_str: str) -> tuple[str, int]:
+    """Parse 'host' or 'host:port' into (host, port). Defaults to _DEFAULT_PORT."""
+    if ":" in broker_str:
+        host, port_str = broker_str.rsplit(":", 1)
+        try:
+            return host, int(port_str)
+        except ValueError:
+            pass
+    return broker_str, _DEFAULT_PORT
+
+
+def _base64url_encode(data: bytes) -> str:
+    """Base64url encode without padding."""
+    return base64.urlsafe_b64encode(data).rstrip(b"=").decode("ascii")
+
+
+def _ed25519_sign_expanded(
+    message: bytes, scalar: bytes, prefix: bytes, public_key: bytes
+) -> bytes:
+    """Sign a message using MeshCore's expanded Ed25519 key format.
+
+    MeshCore stores 64-byte "orlp" format keys: scalar(32) || prefix(32).
+    Standard Ed25519 libraries expect seed format and would re-SHA-512 the key.
+    This performs the signing manually using the already-expanded key material.
+
+    Port of meshcore-packet-capture's ed25519_sign_with_expanded_key().
+    """
+    # r = SHA-512(prefix || message) mod L
+    r = int.from_bytes(hashlib.sha512(prefix + message).digest(), "little") % _L
+    # R = r * B (base point multiplication)
+    R = nacl.bindings.crypto_scalarmult_ed25519_base_noclamp(r.to_bytes(32, "little"))
+    # k = SHA-512(R || public_key || message) mod L
+    k = int.from_bytes(hashlib.sha512(R + public_key + message).digest(), "little") % _L
+    # s = (r + k * scalar) mod L
+    s = (r + k * int.from_bytes(scalar, "little")) % _L
+    return R + s.to_bytes(32, "little")
+
+
+def _generate_jwt_token(
+    private_key: bytes,
+    public_key: bytes,
+    *,
+    audience: str = _DEFAULT_BROKER,
+    email: str = "",
+) -> str:
+    """Generate a JWT token for community MQTT authentication.
+
+    Creates a token with Ed25519 signature using MeshCore's expanded key format.
+    Token format: header_b64.payload_b64.signature_hex
+
+    Optional ``email`` embeds a node-claiming identity so the community
+    aggregator can associate this radio with an owner.
+    """
+    header = {"alg": "Ed25519", "typ": "JWT"}
+    now = int(time.time())
+    pubkey_hex = public_key.hex().upper()
+    payload: dict[str, object] = {
+        "publicKey": pubkey_hex,
+        "iat": now,
+        "exp": now + _TOKEN_LIFETIME,
+        "aud": audience,
+        "owner": pubkey_hex,
+        "client": _CLIENT_ID,
+    }
+    if email:
+        payload["email"] = email
+
+    header_b64 = _base64url_encode(json.dumps(header, separators=(",", ":")).encode())
+    payload_b64 = _base64url_encode(json.dumps(payload, separators=(",", ":")).encode())
+
+    signing_input = f"{header_b64}.{payload_b64}".encode()
+
+    scalar = private_key[:32]
+    prefix = private_key[32:]
+    signature = _ed25519_sign_expanded(signing_input, scalar, prefix, public_key)
+
+    return f"{header_b64}.{payload_b64}.{signature.hex()}"
+
+
+def _calculate_packet_hash(raw_bytes: bytes) -> str:
+    """Calculate packet hash matching MeshCore's Packet::calculatePacketHash().
+
+    Parses the packet structure to extract payload type and payload data,
+    then hashes: payload_type(1 byte) [+ path_len(2 bytes LE) for TRACE] + payload_data.
+    Returns first 16 hex characters (uppercase).
+    """
+    if not raw_bytes:
+        return "0" * 16
+
+    try:
+        header = raw_bytes[0]
+        payload_type = (header >> 2) & 0x0F
+        route_type = header & 0x03
+
+        # Transport codes present for TRANSPORT_FLOOD (0) and TRANSPORT_DIRECT (3)
+        has_transport = route_type in (0x00, 0x03)
+
+        offset = 1  # Past header
+        if has_transport:
+            offset += 4  # Skip 4 bytes of transport codes
+
+        # Read path_len (1 byte on wire). Invalid/truncated packets map to zero hash.
+        if offset >= len(raw_bytes):
+            return "0" * 16
+        path_len = raw_bytes[offset]
+        offset += 1
+
+        # Skip past path to get to payload. Invalid/truncated packets map to zero hash.
+        if len(raw_bytes) < offset + path_len:
+            return "0" * 16
+        payload_start = offset + path_len
+        payload_data = raw_bytes[payload_start:]
+
+        # Hash: payload_type(1 byte) [+ path_len as uint16_t LE for TRACE] + payload_data
+        hash_obj = hashlib.sha256()
+        hash_obj.update(bytes([payload_type]))
+        if payload_type == 9:  # PAYLOAD_TYPE_TRACE
+            hash_obj.update(path_len.to_bytes(2, byteorder="little"))
+        hash_obj.update(payload_data)
+
+        return hash_obj.hexdigest()[:16].upper()
+    except Exception:
+        return "0" * 16
+
+
+def _decode_packet_fields(raw_bytes: bytes) -> tuple[str, str, str, list[str], int | None]:
+    """Decode packet fields used by the community uploader payload format.
+
+    Returns:
+        (route_letter, packet_type_str, payload_len_str, path_values, payload_type_int)
+    """
+    # Reference defaults when decode fails
+    route = "U"
+    packet_type = "0"
+    payload_len = "0"
+    path_values: list[str] = []
+    payload_type: int | None = None
+
+    try:
+        if len(raw_bytes) < 2:
+            return route, packet_type, payload_len, path_values, payload_type
+
+        header = raw_bytes[0]
+        payload_version = (header >> 6) & 0x03
+        if payload_version != 0:
+            return route, packet_type, payload_len, path_values, payload_type
+
+        route_type = header & 0x03
+        has_transport = route_type in (0x00, 0x03)
+
+        offset = 1
+        if has_transport:
+            offset += 4
+
+        if len(raw_bytes) <= offset:
+            return route, packet_type, payload_len, path_values, payload_type
+
+        path_len = raw_bytes[offset]
+        offset += 1
+
+        if len(raw_bytes) < offset + path_len:
+            return route, packet_type, payload_len, path_values, payload_type
+
+        path_bytes = raw_bytes[offset : offset + path_len]
+        offset += path_len
+
+        payload_type = (header >> 2) & 0x0F
+        route = _ROUTE_MAP.get(route_type, "U")
+        packet_type = str(payload_type)
+        payload_len = str(max(0, len(raw_bytes) - offset))
+        path_values = [f"{b:02x}" for b in path_bytes]
+
+        return route, packet_type, payload_len, path_values, payload_type
+    except Exception:
+        return route, packet_type, payload_len, path_values, payload_type
+
+
+def _format_raw_packet(data: dict[str, Any], device_name: str, public_key_hex: str) -> dict:
+    """Convert a RawPacketBroadcast dict to meshcore-packet-capture format."""
+    raw_hex = data.get("data", "")
+    raw_bytes = bytes.fromhex(raw_hex) if raw_hex else b""
+
+    route, packet_type, payload_len, path_values, _payload_type = _decode_packet_fields(raw_bytes)
+
+    # Reference format uses local "now" timestamp and derived time/date fields.
+    current_time = datetime.now()
+    ts_str = current_time.isoformat()
+
+    # SNR/RSSI are always strings in reference output.
+    snr_val = data.get("snr")
+    rssi_val = data.get("rssi")
+    snr = str(snr_val) if snr_val is not None else "Unknown"
+    rssi = str(rssi_val) if rssi_val is not None else "Unknown"
+
+    packet_hash = _calculate_packet_hash(raw_bytes)
+
+    packet = {
+        "origin": device_name or "MeshCore Device",
+        "origin_id": public_key_hex.upper(),
+        "timestamp": ts_str,
+        "type": "PACKET",
+        "direction": "rx",
+        "time": current_time.strftime("%H:%M:%S"),
+        "date": current_time.strftime("%d/%m/%Y"),
+        "len": str(len(raw_bytes)),
+        "packet_type": packet_type,
+        "route": route,
+        "payload_len": payload_len,
+        "raw": raw_hex.upper(),
+        "SNR": snr,
+        "RSSI": rssi,
+        "hash": packet_hash,
+    }
+
+    if route == "D":
+        packet["path"] = ",".join(path_values)
+
+    return packet
+
+
+def _broadcast_health_update() -> None:
+    """Push a health broadcast so the frontend sees updated MQTT status badges."""
+    from app.radio import radio_manager
+    from app.websocket import broadcast_health
+
+    broadcast_health(radio_manager.is_connected, radio_manager.connection_info)
+
+
+class CommunityMqttPublisher:
+    """Manages the community MQTT connection and publishes raw packets."""
+
+    def __init__(self) -> None:
+        self._client: aiomqtt.Client | None = None
+        self._task: asyncio.Task[None] | None = None
+        self._settings: AppSettings | None = None
+        self._settings_version: int = 0
+        self._version_event: asyncio.Event = asyncio.Event()
+        self.connected: bool = False
+
+    async def start(self, settings: AppSettings) -> None:
+        """Start the background connection loop."""
+        self._settings = settings
+        self._settings_version += 1
+        self._version_event.set()
+        if self._task is None or self._task.done():
+            self._task = asyncio.create_task(self._connection_loop())
+
+    async def stop(self) -> None:
+        """Cancel the background task and disconnect."""
+        if self._task and not self._task.done():
+            self._task.cancel()
+            try:
+                await self._task
+            except asyncio.CancelledError:
+                pass
+        self._task = None
+        self._client = None
+        self.connected = False
+
+    async def restart(self, settings: AppSettings) -> None:
+        """Called when community MQTT settings change — stop + start."""
+        await self.stop()
+        await self.start(settings)
+
+    async def publish(self, topic: str, payload: dict[str, Any]) -> None:
+        """Publish a JSON payload. Drops silently if not connected."""
+        if self._client is None or not self.connected:
+            return
+        try:
+            await self._client.publish(topic, json.dumps(payload))
+        except Exception as e:
+            logger.warning("Community MQTT publish failed on %s: %s", topic, e)
+            self.connected = False
+
+    def _is_configured(self) -> bool:
+        """Check if community MQTT is enabled and keys are available."""
+        from app.keystore import has_private_key
+
+        return bool(self._settings and self._settings.community_mqtt_enabled and has_private_key())
+
+    async def _connection_loop(self) -> None:
+        """Background loop: connect, wait, reconnect on failure."""
+        from app.keystore import get_private_key, get_public_key
+        from app.websocket import broadcast_error, broadcast_success
+
+        backoff = _BACKOFF_MIN
+
+        while True:
+            if not self._is_configured():
+                self.connected = False
+                self._client = None
+                self._version_event.clear()
+                try:
+                    # Also wake periodically so newly exported keys are detected without a settings change.
+                    await asyncio.wait_for(self._version_event.wait(), timeout=30)
+                except asyncio.TimeoutError:
+                    continue
+                except asyncio.CancelledError:
+                    return
+                continue
+
+            settings = self._settings
+            assert settings is not None
+            version_at_connect = self._settings_version
+
+            try:
+                private_key = get_private_key()
+                public_key = get_public_key()
+                if private_key is None or public_key is None:
+                    # Keys not available yet, wait for settings change
+                    self.connected = False
+                    self._version_event.clear()
+                    try:
+                        await asyncio.wait_for(self._version_event.wait(), timeout=30)
+                    except asyncio.TimeoutError:
+                        continue
+                    except asyncio.CancelledError:
+                        return
+                    continue
+
+                pubkey_hex = public_key.hex().upper()
+                broker_raw = settings.community_mqtt_broker or _DEFAULT_BROKER
+                broker_host, broker_port = _parse_broker_address(broker_raw)
+                jwt_token = _generate_jwt_token(
+                    private_key,
+                    public_key,
+                    audience=broker_host,
+                    email=settings.community_mqtt_email or "",
+                )
+                token_created_at = time.monotonic()
+
+                tls_context = ssl.create_default_context()
+
+                async with aiomqtt.Client(
+                    hostname=broker_host,
+                    port=broker_port,
+                    transport="websockets",
+                    tls_context=tls_context,
+                    websocket_path="/",
+                    username=f"v1_{pubkey_hex}",
+                    password=jwt_token,
+                ) as client:
+                    self._client = client
+                    self.connected = True
+                    backoff = _BACKOFF_MIN
+
+                    broadcast_success(
+                        "Community MQTT connected",
+                        f"{broker_host}:{broker_port}",
+                    )
+                    _broadcast_health_update()
+
+                    # Wait until cancelled, settings change, or token nears expiry
+                    while self._settings_version == version_at_connect:
+                        self._version_event.clear()
+                        try:
+                            await asyncio.wait_for(self._version_event.wait(), timeout=60)
+                        except asyncio.TimeoutError:
+                            # Detect publish failure: reconnect so packets resume
+                            if not self.connected:
+                                logger.info("Community MQTT publish failure detected, reconnecting")
+                                break
+                            # Proactive JWT renewal: reconnect before token expires
+                            if time.monotonic() - token_created_at >= _TOKEN_RENEWAL_THRESHOLD:
+                                logger.info("Community MQTT JWT nearing expiry, reconnecting")
+                                break
+                            continue
+
+                # async with exited — client is now closed
+                self._client = None
+                self.connected = False
+                _broadcast_health_update()
+
+            except asyncio.CancelledError:
+                self.connected = False
+                self._client = None
+                return
+
+            except Exception as e:
+                self.connected = False
+                self._client = None
+
+                broadcast_error(
+                    "Community MQTT connection failure",
+                    "Check your internet connection or try again later.",
+                )
+                _broadcast_health_update()
+                logger.warning(
+                    "Community MQTT connection error: %s (reconnecting in %ds)", e, backoff
+                )
+
+                try:
+                    await asyncio.sleep(backoff)
+                except asyncio.CancelledError:
+                    return
+                backoff = min(backoff * 2, _BACKOFF_MAX)
+
+
+# Module-level singleton
+community_publisher = CommunityMqttPublisher()
+
+
+def community_mqtt_broadcast(event_type: str, data: dict[str, Any]) -> None:
+    """Fire-and-forget community MQTT publish for raw packets only."""
+    if event_type != "raw_packet":
+        return
+    if not community_publisher.connected or community_publisher._settings is None:
+        return
+    asyncio.create_task(_community_maybe_publish(data))
+
+
+async def _community_maybe_publish(data: dict[str, Any]) -> None:
+    """Format and publish a raw packet to the community broker."""
+    settings = community_publisher._settings
+    if settings is None or not settings.community_mqtt_enabled:
+        return
+
+    try:
+        from app.keystore import get_public_key
+        from app.radio import radio_manager
+
+        public_key = get_public_key()
+        if public_key is None:
+            return
+
+        pubkey_hex = public_key.hex().upper()
+
+        # Get device name from radio
+        device_name = ""
+        if radio_manager.meshcore and radio_manager.meshcore.self_info:
+            device_name = radio_manager.meshcore.self_info.get("name", "")
+
+        packet = _format_raw_packet(data, device_name, pubkey_hex)
+        iata = settings.community_mqtt_iata.upper().strip()
+        if not _IATA_RE.fullmatch(iata):
+            logger.debug("Community MQTT: skipping publish — no valid IATA code configured")
+            return
+        topic = f"meshcore/{iata}/{pubkey_hex}/packets"
+
+        await community_publisher.publish(topic, packet)
+
+    except Exception as e:
+        logger.warning("Community MQTT broadcast error: %s", e)

app/main.py

@@ -56,19 +56,22 @@ async def lifespan(app: FastAPI):
     # Always start connection monitor (even if initial connection failed)
     await radio_manager.start_connection_monitor()
 
-    # Start MQTT publisher if configured
+    # Start MQTT publishers if configured
+    from app.community_mqtt import community_publisher
     from app.mqtt import mqtt_publisher
     from app.repository import AppSettingsRepository
 
     try:
         mqtt_settings = await AppSettingsRepository.get()
         await mqtt_publisher.start(mqtt_settings)
+        await community_publisher.start(mqtt_settings)
     except Exception as e:
-        logger.warning("Failed to start MQTT publisher: %s", e)
+        logger.warning("Failed to start MQTT publisher(s): %s", e)
 
     yield
 
     logger.info("Shutting down")
+    await community_publisher.stop()
     await mqtt_publisher.stop()
     await radio_manager.stop_connection_monitor()
     await stop_message_polling()

app/migrations.py

@@ -254,6 +254,13 @@ async def run_migrations(conn: aiosqlite.Connection) -> int:
         await set_version(conn, 31)
         applied += 1
 
+    # Migration 32: Add community MQTT columns to app_settings
+    if version < 32:
+        logger.info("Applying migration 32: add community MQTT columns to app_settings")
+        await _migrate_032_add_community_mqtt_columns(conn)
+        await set_version(conn, 32)
+        applied += 1
+
     if applied > 0:
         logger.info(
             "Applied %d migration(s), schema now at version %d", applied, await get_version(conn)
@@ -1891,3 +1898,30 @@ async def _migrate_031_add_mqtt_columns(conn: aiosqlite.Connection) -> None:
             await conn.execute(f"ALTER TABLE app_settings ADD COLUMN {col_name} {col_def}")
 
     await conn.commit()
+
+
+async def _migrate_032_add_community_mqtt_columns(conn: aiosqlite.Connection) -> None:
+    """Add community MQTT configuration columns to app_settings."""
+    # Guard: app_settings may not exist in partial-schema test setups
+    cursor = await conn.execute(
+        "SELECT name FROM sqlite_master WHERE type='table' AND name='app_settings'"
+    )
+    if not await cursor.fetchone():
+        await conn.commit()
+        return
+
+    cursor = await conn.execute("PRAGMA table_info(app_settings)")
+    columns = {row[1] for row in await cursor.fetchall()}
+
+    new_columns = [
+        ("community_mqtt_enabled", "INTEGER DEFAULT 0"),
+        ("community_mqtt_iata", "TEXT DEFAULT ''"),
+        ("community_mqtt_broker", "TEXT DEFAULT 'mqtt-us-v1.letsmesh.net'"),
+        ("community_mqtt_email", "TEXT DEFAULT ''"),
+    ]
+
+    for col_name, col_def in new_columns:
+        if col_name not in columns:
+            await conn.execute(f"ALTER TABLE app_settings ADD COLUMN {col_name} {col_def}")
+
+    await conn.commit()

app/models.py

@@ -463,6 +463,22 @@ class AppSettings(BaseModel):
         default=False,
         description="Whether to publish raw packets to MQTT",
     )
+    community_mqtt_enabled: bool = Field(
+        default=False,
+        description="Whether to publish raw packets to the community MQTT broker (letsmesh.net)",
+    )
+    community_mqtt_iata: str = Field(
+        default="",
+        description="IATA region code for community MQTT topic routing (3 alpha chars)",
+    )
+    community_mqtt_broker: str = Field(
+        default="mqtt-us-v1.letsmesh.net",
+        description="Community MQTT broker hostname",
+    )
+    community_mqtt_email: str = Field(
+        default="",
+        description="Email address for node claiming on the community aggregator (optional)",
+    )
 
 
 class BusyChannel(BaseModel):

app/repository/settings.py

@@ -29,7 +29,9 @@ class AppSettingsRepository:
                    advert_interval, last_advert_time, bots,
                    mqtt_broker_host, mqtt_broker_port, mqtt_username, mqtt_password,
                    mqtt_use_tls, mqtt_tls_insecure, mqtt_topic_prefix,
-                   mqtt_publish_messages, mqtt_publish_raw_packets
+                   mqtt_publish_messages, mqtt_publish_raw_packets,
+                   community_mqtt_enabled, community_mqtt_iata,
+                   community_mqtt_broker, community_mqtt_email
             FROM app_settings WHERE id = 1
             """
         )
@@ -103,6 +105,10 @@ class AppSettingsRepository:
             mqtt_topic_prefix=row["mqtt_topic_prefix"] or "meshcore",
             mqtt_publish_messages=bool(row["mqtt_publish_messages"]),
             mqtt_publish_raw_packets=bool(row["mqtt_publish_raw_packets"]),
+            community_mqtt_enabled=bool(row["community_mqtt_enabled"]),
+            community_mqtt_iata=row["community_mqtt_iata"] or "",
+            community_mqtt_broker=row["community_mqtt_broker"] or "mqtt-us-v1.letsmesh.net",
+            community_mqtt_email=row["community_mqtt_email"] or "",
         )
 
     @staticmethod
@@ -125,6 +131,10 @@ class AppSettingsRepository:
         mqtt_topic_prefix: str | None = None,
         mqtt_publish_messages: bool | None = None,
         mqtt_publish_raw_packets: bool | None = None,
+        community_mqtt_enabled: bool | None = None,
+        community_mqtt_iata: str | None = None,
+        community_mqtt_broker: str | None = None,
+        community_mqtt_email: str | None = None,
     ) -> AppSettings:
         """Update app settings. Only provided fields are updated."""
         updates = []
@@ -204,6 +214,22 @@ class AppSettingsRepository:
             updates.append("mqtt_publish_raw_packets = ?")
             params.append(1 if mqtt_publish_raw_packets else 0)
 
+        if community_mqtt_enabled is not None:
+            updates.append("community_mqtt_enabled = ?")
+            params.append(1 if community_mqtt_enabled else 0)
+
+        if community_mqtt_iata is not None:
+            updates.append("community_mqtt_iata = ?")
+            params.append(community_mqtt_iata)
+
+        if community_mqtt_broker is not None:
+            updates.append("community_mqtt_broker = ?")
+            params.append(community_mqtt_broker)
+
+        if community_mqtt_email is not None:
+            updates.append("community_mqtt_email = ?")
+            params.append(community_mqtt_email)
+
         if updates:
             query = f"UPDATE app_settings SET {', '.join(updates)} WHERE id = 1"
             await db.conn.execute(query, params)

app/routers/health.py

@@ -17,6 +17,7 @@ class HealthResponse(BaseModel):
     database_size_mb: float
     oldest_undecrypted_timestamp: int | None
     mqtt_status: str | None = None
+    community_mqtt_status: str | None = None
 
 
 async def build_health_data(radio_connected: bool, connection_info: str | None) -> dict:
@@ -46,6 +47,18 @@ async def build_health_data(radio_connected: bool, connection_info: str | None)
     except Exception:
         pass
 
+    # Community MQTT status
+    community_mqtt_status: str | None = None
+    try:
+        from app.community_mqtt import community_publisher
+
+        if community_publisher._is_configured():
+            community_mqtt_status = "connected" if community_publisher.connected else "disconnected"
+        else:
+            community_mqtt_status = "disabled"
+    except Exception:
+        pass
+
     return {
         "status": "ok" if radio_connected else "degraded",
         "radio_connected": radio_connected,
@@ -53,6 +66,7 @@ async def build_health_data(radio_connected: bool, connection_info: str | None)
         "database_size_mb": db_size_mb,
         "oldest_undecrypted_timestamp": oldest_ts,
         "mqtt_status": mqtt_status,
+        "community_mqtt_status": community_mqtt_status,
     }
 
 

app/routers/settings.py

@@ -1,5 +1,6 @@
 import asyncio
 import logging
+import re
 from typing import Literal
 
 from fastapi import APIRouter, HTTPException
@@ -97,6 +98,22 @@ class AppSettingsUpdate(BaseModel):
         default=None,
         description="Whether to publish raw packets to MQTT",
     )
+    community_mqtt_enabled: bool | None = Field(
+        default=None,
+        description="Whether to publish raw packets to the community MQTT broker",
+    )
+    community_mqtt_iata: str | None = Field(
+        default=None,
+        description="IATA region code for community MQTT topic routing (3 alpha chars)",
+    )
+    community_mqtt_broker: str | None = Field(
+        default=None,
+        description="Community MQTT broker hostname",
+    )
+    community_mqtt_email: str | None = Field(
+        default=None,
+        description="Email address for node claiming on the community aggregator",
+    )
 
 
 class FavoriteRequest(BaseModel):
@@ -181,6 +198,43 @@ async def update_settings(update: AppSettingsUpdate) -> AppSettings:
             kwargs[field] = value
             mqtt_changed = True
 
+    # Community MQTT fields
+    community_mqtt_changed = False
+    if update.community_mqtt_enabled is not None:
+        kwargs["community_mqtt_enabled"] = update.community_mqtt_enabled
+        community_mqtt_changed = True
+
+    if update.community_mqtt_iata is not None:
+        iata = update.community_mqtt_iata.upper().strip()
+        if iata and not re.fullmatch(r"[A-Z]{3}", iata):
+            raise HTTPException(
+                status_code=400,
+                detail="IATA code must be exactly 3 uppercase alphabetic characters",
+            )
+        kwargs["community_mqtt_iata"] = iata
+        community_mqtt_changed = True
+
+    if update.community_mqtt_broker is not None:
+        kwargs["community_mqtt_broker"] = update.community_mqtt_broker
+        community_mqtt_changed = True
+
+    if update.community_mqtt_email is not None:
+        kwargs["community_mqtt_email"] = update.community_mqtt_email
+        community_mqtt_changed = True
+
+    # Require IATA when enabling community MQTT
+    if kwargs.get("community_mqtt_enabled", False):
+        # Check the IATA value being set, or fall back to current settings
+        iata_value = kwargs.get("community_mqtt_iata")
+        if iata_value is None:
+            current = await AppSettingsRepository.get()
+            iata_value = current.community_mqtt_iata
+        if not iata_value or not re.fullmatch(r"[A-Z]{3}", iata_value):
+            raise HTTPException(
+                status_code=400,
+                detail="A valid IATA region code is required to enable community sharing",
+            )
+
     if kwargs:
         result = await AppSettingsRepository.update(**kwargs)
 
@@ -190,6 +244,12 @@ async def update_settings(update: AppSettingsUpdate) -> AppSettings:
 
             await mqtt_publisher.restart(result)
 
+        # Restart community MQTT publisher if any community settings changed
+        if community_mqtt_changed:
+            from app.community_mqtt import community_publisher
+
+            await community_publisher.restart(result)
+
         return result
 
     return await AppSettingsRepository.get()

app/websocket.py

@@ -104,6 +104,10 @@ def broadcast_event(event_type: str, data: dict) -> None:
 
     mqtt_broadcast(event_type, data)
 
+    from app.community_mqtt import community_mqtt_broadcast
+
+    community_mqtt_broadcast(event_type, data)
+
 
 def broadcast_error(message: str, details: str | None = None) -> None:
     """Broadcast an error notification to all connected clients.

frontend/src/components/settings/SettingsMqttSection.tsx

@@ -27,6 +27,12 @@ export function SettingsMqttSection({
   const [mqttPublishMessages, setMqttPublishMessages] = useState(false);
   const [mqttPublishRawPackets, setMqttPublishRawPackets] = useState(false);
 
+  // Community MQTT state
+  const [communityMqttEnabled, setCommunityMqttEnabled] = useState(false);
+  const [communityMqttIata, setCommunityMqttIata] = useState('');
+  const [communityMqttBroker, setCommunityMqttBroker] = useState('mqtt-us-v1.letsmesh.net');
+  const [communityMqttEmail, setCommunityMqttEmail] = useState('');
+
   const [busy, setBusy] = useState(false);
   const [error, setError] = useState<string | null>(null);
 
@@ -40,6 +46,10 @@ export function SettingsMqttSection({
     setMqttTopicPrefix(appSettings.mqtt_topic_prefix ?? 'meshcore');
     setMqttPublishMessages(appSettings.mqtt_publish_messages ?? false);
     setMqttPublishRawPackets(appSettings.mqtt_publish_raw_packets ?? false);
+    setCommunityMqttEnabled(appSettings.community_mqtt_enabled ?? false);
+    setCommunityMqttIata(appSettings.community_mqtt_iata ?? '');
+    setCommunityMqttBroker(appSettings.community_mqtt_broker ?? 'mqtt-us-v1.letsmesh.net');
+    setCommunityMqttEmail(appSettings.community_mqtt_email ?? '');
   }, [appSettings]);
 
   const handleSave = async () => {
@@ -57,6 +67,10 @@ export function SettingsMqttSection({
         mqtt_topic_prefix: mqttTopicPrefix || 'meshcore',
         mqtt_publish_messages: mqttPublishMessages,
         mqtt_publish_raw_packets: mqttPublishRawPackets,
+        community_mqtt_enabled: communityMqttEnabled,
+        community_mqtt_iata: communityMqttIata,
+        community_mqtt_broker: communityMqttBroker || 'mqtt-us-v1.letsmesh.net',
+        community_mqtt_email: communityMqttEmail,
       };
       await onSaveAppSettings(update);
       toast.success('MQTT settings saved');
@@ -69,6 +83,14 @@ export function SettingsMqttSection({
 
   return (
     <div className={className}>
+      <div className="space-y-1">
+        <h4 className="text-sm font-medium">Private MQTT Broker</h4>
+        <p className="text-xs text-muted-foreground">
+          Forward all mesh data to your own MQTT broker for home automation, logging, or alerting.
+          Publishes both decrypted messages and raw packets to your broker.
+        </p>
+      </div>
+
       <div className="space-y-2">
         <Label>Status</Label>
         {health?.mqtt_status === 'connected' ? (
@@ -218,6 +240,95 @@ export function SettingsMqttSection({
       </label>
       <p className="text-xs text-muted-foreground ml-7">Forward all RF packets</p>
 
+      <Separator />
+
+      <div className="space-y-3">
+        <h4 className="text-sm font-medium">Community Analytics</h4>
+        <p className="text-xs text-muted-foreground">
+          Share raw packet data with the MeshCore community for coverage mapping and network
+          analysis. Only raw RF packets are shared — never decrypted messages.
+        </p>
+        <div className="flex items-center gap-2 mb-2">
+          {health?.community_mqtt_status === 'connected' ? (
+            <>
+              <div className="w-2 h-2 rounded-full bg-green-500" />
+              <span className="text-sm text-green-400">Connected</span>
+            </>
+          ) : health?.community_mqtt_status === 'disconnected' ? (
+            <>
+              <div className="w-2 h-2 rounded-full bg-red-500" />
+              <span className="text-sm text-red-400">Disconnected</span>
+            </>
+          ) : (
+            <>
+              <div className="w-2 h-2 rounded-full bg-gray-500" />
+              <span className="text-sm text-muted-foreground">Disabled</span>
+            </>
+          )}
+        </div>
+        <label className="flex items-center gap-3 cursor-pointer">
+          <input
+            type="checkbox"
+            checked={communityMqttEnabled}
+            onChange={(e) => setCommunityMqttEnabled(e.target.checked)}
+            className="h-4 w-4 rounded border-border"
+          />
+          <span className="text-sm">Enable Community Analytics</span>
+        </label>
+
+        {communityMqttEnabled && (
+          <div className="space-y-2">
+            <Label htmlFor="community-broker">Broker Address</Label>
+            <Input
+              id="community-broker"
+              type="text"
+              placeholder="mqtt-us-v1.letsmesh.net:443"
+              value={communityMqttBroker}
+              onChange={(e) => setCommunityMqttBroker(e.target.value)}
+            />
+            <p className="text-xs text-muted-foreground">host or host:port (default port 443)</p>
+            <Label htmlFor="community-iata">Region Code (IATA)</Label>
+            <Input
+              id="community-iata"
+              type="text"
+              maxLength={3}
+              placeholder="e.g. DEN, LAX, NYC"
+              value={communityMqttIata}
+              onChange={(e) => setCommunityMqttIata(e.target.value.toUpperCase())}
+              className="w-32"
+            />
+            <p className="text-xs text-muted-foreground">
+              Your nearest airport&apos;s{' '}
+              <a
+                href="https://en.wikipedia.org/wiki/List_of_airports_by_IATA_airport_code:_A"
+                target="_blank"
+                rel="noopener noreferrer"
+                className="underline hover:text-foreground"
+              >
+                IATA code
+              </a>{' '}
+              (required)
+            </p>
+            {communityMqttIata && (
+              <p className="text-xs text-muted-foreground">
+                Topic: meshcore/{communityMqttIata}/&lt;pubkey&gt;/packets
+              </p>
+            )}
+            <Label htmlFor="community-email">Owner Email (optional)</Label>
+            <Input
+              id="community-email"
+              type="email"
+              placeholder="you@example.com"
+              value={communityMqttEmail}
+              onChange={(e) => setCommunityMqttEmail(e.target.value)}
+            />
+            <p className="text-xs text-muted-foreground">
+              Used to claim your node on the community aggregator
+            </p>
+          </div>
+        )}
+      </div>
+
       <Button onClick={handleSave} disabled={busy} className="w-full">
         {busy ? 'Saving...' : 'Save MQTT Settings'}
       </Button>

frontend/src/test/settingsModal.test.tsx

@@ -39,6 +39,7 @@ const baseHealth: HealthStatus = {
   database_size_mb: 1.2,
   oldest_undecrypted_timestamp: null,
   mqtt_status: null,
+  community_mqtt_status: null,
 };
 
 const baseSettings: AppSettings = {
@@ -60,6 +61,10 @@ const baseSettings: AppSettings = {
   mqtt_topic_prefix: 'meshcore',
   mqtt_publish_messages: false,
   mqtt_publish_raw_packets: false,
+  community_mqtt_enabled: false,
+  community_mqtt_iata: '',
+  community_mqtt_broker: 'mqtt-us-v1.letsmesh.net',
+  community_mqtt_email: '',
 };
 
 function renderModal(overrides?: {
@@ -446,7 +451,9 @@ describe('SettingsModal', () => {
     });
     openMqttSection();
 
-    expect(screen.getByText('Disabled')).toBeInTheDocument();
+    // Both MQTT and community MQTT show "Disabled" when null status
+    const disabledElements = screen.getAllByText('Disabled');
+    expect(disabledElements.length).toBeGreaterThanOrEqual(1);
   });
 
   it('shows MQTT connected status badge', () => {
@@ -465,6 +472,73 @@ describe('SettingsModal', () => {
     expect(screen.getByText('Connected')).toBeInTheDocument();
   });
 
+  it('renders community sharing section in MQTT tab', () => {
+    renderModal();
+    openMqttSection();
+
+    expect(screen.getByText('Community Analytics')).toBeInTheDocument();
+    expect(screen.getByText('Enable Community Analytics')).toBeInTheDocument();
+  });
+
+  it('shows IATA input only when community sharing is enabled', () => {
+    renderModal({
+      appSettings: {
+        ...baseSettings,
+        community_mqtt_enabled: false,
+      },
+    });
+    openMqttSection();
+
+    expect(screen.queryByLabelText('Region Code (IATA)')).not.toBeInTheDocument();
+
+    // Enable community sharing
+    fireEvent.click(screen.getByText('Enable Community Analytics'));
+    expect(screen.getByLabelText('Region Code (IATA)')).toBeInTheDocument();
+  });
+
+  it('includes community MQTT fields in save payload', async () => {
+    const { onSaveAppSettings } = renderModal({
+      appSettings: {
+        ...baseSettings,
+        community_mqtt_enabled: true,
+        community_mqtt_iata: 'DEN',
+      },
+    });
+    openMqttSection();
+
+    fireEvent.click(screen.getByRole('button', { name: 'Save MQTT Settings' }));
+
+    await waitFor(() => {
+      expect(onSaveAppSettings).toHaveBeenCalledWith(
+        expect.objectContaining({
+          community_mqtt_enabled: true,
+          community_mqtt_iata: 'DEN',
+        })
+      );
+    });
+  });
+
+  it('shows community MQTT connected status badge', () => {
+    renderModal({
+      appSettings: {
+        ...baseSettings,
+        community_mqtt_enabled: true,
+      },
+      health: {
+        ...baseHealth,
+        community_mqtt_status: 'connected',
+      },
+    });
+    openMqttSection();
+
+    // Community Analytics sub-section should show Connected
+    const communitySection = screen.getByText('Community Analytics').closest('div');
+    expect(communitySection).not.toBeNull();
+    // Both MQTT and community could show "Connected" — check count
+    const connectedElements = screen.getAllByText('Connected');
+    expect(connectedElements.length).toBeGreaterThanOrEqual(1);
+  });
+
   it('fetches statistics when expanded in mobile external-nav mode', async () => {
     const mockStats: StatisticsResponse = {
       busiest_channels_24h: [],

frontend/src/types.ts

@@ -30,6 +30,7 @@ export interface HealthStatus {
   database_size_mb: number;
   oldest_undecrypted_timestamp: number | null;
   mqtt_status: string | null;
+  community_mqtt_status: string | null;
 }
 
 export interface MaintenanceResult {
@@ -192,6 +193,10 @@ export interface AppSettings {
   mqtt_topic_prefix: string;
   mqtt_publish_messages: boolean;
   mqtt_publish_raw_packets: boolean;
+  community_mqtt_enabled: boolean;
+  community_mqtt_iata: string;
+  community_mqtt_broker: string;
+  community_mqtt_email: string;
 }
 
 export interface AppSettingsUpdate {
@@ -209,6 +214,10 @@ export interface AppSettingsUpdate {
   mqtt_topic_prefix?: string;
   mqtt_publish_messages?: boolean;
   mqtt_publish_raw_packets?: boolean;
+  community_mqtt_enabled?: boolean;
+  community_mqtt_iata?: string;
+  community_mqtt_broker?: string;
+  community_mqtt_email?: string;
 }
 
 export interface MigratePreferencesRequest {

tests/test_community_mqtt.py

@@ -0,0 +1,463 @@
+"""Tests for community MQTT publisher."""
+
+import json
+from unittest.mock import MagicMock, patch
+
+import nacl.bindings
+import pytest
+
+from app.community_mqtt import (
+    _CLIENT_ID,
+    _DEFAULT_BROKER,
+    _DEFAULT_PORT,
+    CommunityMqttPublisher,
+    _base64url_encode,
+    _calculate_packet_hash,
+    _ed25519_sign_expanded,
+    _format_raw_packet,
+    _generate_jwt_token,
+    _parse_broker_address,
+    community_mqtt_broadcast,
+)
+from app.models import AppSettings
+
+
+def _make_test_keys() -> tuple[bytes, bytes]:
+    """Generate a test MeshCore-format key pair.
+
+    Returns (private_key_64_bytes, public_key_32_bytes).
+    MeshCore format: scalar(32) || prefix(32), where scalar is already clamped.
+    """
+    import hashlib
+    import os
+
+    seed = os.urandom(32)
+    expanded = hashlib.sha512(seed).digest()
+    scalar = bytearray(expanded[:32])
+    # Clamp scalar (standard Ed25519 clamping)
+    scalar[0] &= 248
+    scalar[31] &= 127
+    scalar[31] |= 64
+    scalar = bytes(scalar)
+    prefix = expanded[32:]
+
+    private_key = scalar + prefix
+    public_key = nacl.bindings.crypto_scalarmult_ed25519_base_noclamp(scalar)
+    return private_key, public_key
+
+
+class TestBase64UrlEncode:
+    def test_encodes_without_padding(self):
+        result = _base64url_encode(b"\x00\x01\x02")
+        assert "=" not in result
+
+    def test_uses_url_safe_chars(self):
+        # Bytes that would produce + and / in standard base64
+        result = _base64url_encode(b"\xfb\xff\xfe")
+        assert "+" not in result
+        assert "/" not in result
+
+
+class TestJwtGeneration:
+    def test_token_has_three_parts(self):
+        private_key, public_key = _make_test_keys()
+        token = _generate_jwt_token(private_key, public_key)
+        parts = token.split(".")
+        assert len(parts) == 3
+
+    def test_header_contains_ed25519_alg(self):
+        private_key, public_key = _make_test_keys()
+        token = _generate_jwt_token(private_key, public_key)
+        header_b64 = token.split(".")[0]
+        # Add padding for base64 decoding
+        import base64
+
+        padded = header_b64 + "=" * (4 - len(header_b64) % 4)
+        header = json.loads(base64.urlsafe_b64decode(padded))
+        assert header["alg"] == "Ed25519"
+        assert header["typ"] == "JWT"
+
+    def test_payload_contains_required_fields(self):
+        private_key, public_key = _make_test_keys()
+        token = _generate_jwt_token(private_key, public_key)
+        payload_b64 = token.split(".")[1]
+        import base64
+
+        padded = payload_b64 + "=" * (4 - len(payload_b64) % 4)
+        payload = json.loads(base64.urlsafe_b64decode(padded))
+        assert payload["publicKey"] == public_key.hex().upper()
+        assert "iat" in payload
+        assert "exp" in payload
+        assert payload["exp"] - payload["iat"] == 86400
+        assert payload["aud"] == _DEFAULT_BROKER
+        assert payload["owner"] == public_key.hex().upper()
+        assert payload["client"] == _CLIENT_ID
+        assert "email" not in payload  # omitted when empty
+
+    def test_payload_includes_email_when_provided(self):
+        private_key, public_key = _make_test_keys()
+        token = _generate_jwt_token(private_key, public_key, email="test@example.com")
+        payload_b64 = token.split(".")[1]
+        import base64
+
+        padded = payload_b64 + "=" * (4 - len(payload_b64) % 4)
+        payload = json.loads(base64.urlsafe_b64decode(padded))
+        assert payload["email"] == "test@example.com"
+
+    def test_payload_uses_custom_audience(self):
+        private_key, public_key = _make_test_keys()
+        token = _generate_jwt_token(private_key, public_key, audience="custom.broker.net")
+        payload_b64 = token.split(".")[1]
+        import base64
+
+        padded = payload_b64 + "=" * (4 - len(payload_b64) % 4)
+        payload = json.loads(base64.urlsafe_b64decode(padded))
+        assert payload["aud"] == "custom.broker.net"
+
+    def test_signature_is_valid_hex(self):
+        private_key, public_key = _make_test_keys()
+        token = _generate_jwt_token(private_key, public_key)
+        sig_hex = token.split(".")[2]
+        sig_bytes = bytes.fromhex(sig_hex)
+        assert len(sig_bytes) == 64
+
+    def test_signature_verifies(self):
+        """Verify the JWT signature using nacl.bindings.crypto_sign_open."""
+        private_key, public_key = _make_test_keys()
+        token = _generate_jwt_token(private_key, public_key)
+        parts = token.split(".")
+        signing_input = f"{parts[0]}.{parts[1]}".encode()
+        signature = bytes.fromhex(parts[2])
+
+        # crypto_sign_open expects signature + message concatenated
+        signed_message = signature + signing_input
+        # This will raise if the signature is invalid
+        verified = nacl.bindings.crypto_sign_open(signed_message, public_key)
+        assert verified == signing_input
+
+
+class TestEddsaSignExpanded:
+    def test_produces_64_byte_signature(self):
+        private_key, public_key = _make_test_keys()
+        message = b"test message"
+        sig = _ed25519_sign_expanded(message, private_key[:32], private_key[32:], public_key)
+        assert len(sig) == 64
+
+    def test_signature_verifies_with_nacl(self):
+        private_key, public_key = _make_test_keys()
+        message = b"hello world"
+        sig = _ed25519_sign_expanded(message, private_key[:32], private_key[32:], public_key)
+
+        signed_message = sig + message
+        verified = nacl.bindings.crypto_sign_open(signed_message, public_key)
+        assert verified == message
+
+    def test_different_messages_produce_different_signatures(self):
+        private_key, public_key = _make_test_keys()
+        sig1 = _ed25519_sign_expanded(b"msg1", private_key[:32], private_key[32:], public_key)
+        sig2 = _ed25519_sign_expanded(b"msg2", private_key[:32], private_key[32:], public_key)
+        assert sig1 != sig2
+
+
+class TestPacketFormatConversion:
+    def test_basic_field_mapping(self):
+        data = {
+            "id": 1,
+            "observation_id": 100,
+            "timestamp": 1700000000,
+            "data": "0a1b2c3d",
+            "payload_type": "ADVERT",
+            "snr": 5.5,
+            "rssi": -90,
+            "decrypted": False,
+            "decrypted_info": None,
+        }
+        result = _format_raw_packet(data, "TestNode", "AABBCCDD" * 8)
+
+        assert result["origin"] == "TestNode"
+        assert result["origin_id"] == "AABBCCDD" * 8
+        assert result["raw"] == "0A1B2C3D"
+        assert result["SNR"] == "5.5"
+        assert result["RSSI"] == "-90"
+        assert result["type"] == "PACKET"
+        assert result["direction"] == "rx"
+        assert result["len"] == "4"
+
+    def test_timestamp_is_iso8601(self):
+        data = {"timestamp": 1700000000, "data": "00", "snr": None, "rssi": None}
+        result = _format_raw_packet(data, "Node", "AA" * 32)
+        assert result["timestamp"]
+        assert "T" in result["timestamp"]
+
+    def test_snr_rssi_unknown_when_none(self):
+        data = {"timestamp": 0, "data": "00", "snr": None, "rssi": None}
+        result = _format_raw_packet(data, "Node", "AA" * 32)
+        assert result["SNR"] == "Unknown"
+        assert result["RSSI"] == "Unknown"
+
+    def test_packet_type_extraction(self):
+        # Header 0x14 = type 5, route 0 (TRANSPORT_FLOOD): header + 4 transport + path_len.
+        data = {"timestamp": 0, "data": "140102030400", "snr": None, "rssi": None}
+        result = _format_raw_packet(data, "Node", "AA" * 32)
+        assert result["packet_type"] == "5"
+        assert result["route"] == "F"
+
+    def test_route_mapping(self):
+        # Test all 4 route types (matches meshcore-packet-capture)
+        # TRANSPORT_FLOOD=0 -> "F", FLOOD=1 -> "F", DIRECT=2 -> "D", TRANSPORT_DIRECT=3 -> "T"
+        samples = [
+            ("000102030400", "F"),  # TRANSPORT_FLOOD: header + transport + path_len
+            ("0100", "F"),  # FLOOD: header + path_len
+            ("0200", "D"),  # DIRECT: header + path_len
+            ("030102030400", "T"),  # TRANSPORT_DIRECT: header + transport + path_len
+        ]
+        for raw_hex, expected in samples:
+            data = {"timestamp": 0, "data": raw_hex, "snr": None, "rssi": None}
+            result = _format_raw_packet(data, "Node", "AA" * 32)
+            assert result["route"] == expected
+
+    def test_hash_is_16_uppercase_hex_chars(self):
+        data = {"timestamp": 0, "data": "aabb", "snr": None, "rssi": None}
+        result = _format_raw_packet(data, "Node", "AA" * 32)
+        assert len(result["hash"]) == 16
+        assert result["hash"] == result["hash"].upper()
+
+    def test_empty_data_handled(self):
+        data = {"timestamp": 0, "data": "", "snr": None, "rssi": None}
+        result = _format_raw_packet(data, "Node", "AA" * 32)
+        assert result["raw"] == ""
+        assert result["len"] == "0"
+        assert result["packet_type"] == "0"
+        assert result["route"] == "U"
+
+    def test_includes_reference_time_fields(self):
+        data = {"timestamp": 0, "data": "0100aabb", "snr": 1.0, "rssi": -70}
+        result = _format_raw_packet(data, "Node", "AA" * 32)
+        assert result["time"]
+        assert result["date"]
+        assert result["payload_len"] == "2"
+
+    def test_adds_path_for_direct_route(self):
+        # route=2 (DIRECT), path_len=2, path=aa bb, payload=cc
+        data = {"timestamp": 0, "data": "0202AABBCC", "snr": 1.0, "rssi": -70}
+        result = _format_raw_packet(data, "Node", "AA" * 32)
+        assert result["route"] == "D"
+        assert result["path"] == "aa,bb"
+
+    def test_direct_route_includes_empty_path_field(self):
+        data = {"timestamp": 0, "data": "0200", "snr": 1.0, "rssi": -70}
+        result = _format_raw_packet(data, "Node", "AA" * 32)
+        assert result["route"] == "D"
+        assert "path" in result
+        assert result["path"] == ""
+
+    def test_unknown_version_uses_defaults(self):
+        # version=1 in high bits, type=5, route=1
+        header = (1 << 6) | (5 << 2) | 1
+        data = {"timestamp": 0, "data": f"{header:02x}00", "snr": 1.0, "rssi": -70}
+        result = _format_raw_packet(data, "Node", "AA" * 32)
+        assert result["packet_type"] == "0"
+        assert result["route"] == "U"
+        assert result["payload_len"] == "0"
+
+
+class TestCalculatePacketHash:
+    def test_empty_bytes_returns_zeroes(self):
+        result = _calculate_packet_hash(b"")
+        assert result == "0" * 16
+
+    def test_returns_16_uppercase_hex_chars(self):
+        # Simple flood packet: header(1) + path_len(1) + payload
+        raw = bytes([0x01, 0x00, 0xAA, 0xBB])  # FLOOD, no path, payload=0xAABB
+        result = _calculate_packet_hash(raw)
+        assert len(result) == 16
+        assert result == result.upper()
+
+    def test_flood_packet_hash(self):
+        """FLOOD route (0x01): no transport codes, header + path_len + payload."""
+        import hashlib
+
+        # Header 0x11 = route=FLOOD(1), payload_type=4(ADVERT): (4<<2)|1 = 0x11
+        payload = b"\xde\xad"
+        raw = bytes([0x11, 0x00]) + payload  # header, path_len=0, payload
+        result = _calculate_packet_hash(raw)
+
+        # Expected: sha256(payload_type_byte + payload_data)[:16].upper()
+        expected = hashlib.sha256(bytes([4]) + payload).hexdigest()[:16].upper()
+        assert result == expected
+
+    def test_transport_flood_skips_transport_codes(self):
+        """TRANSPORT_FLOOD (0x00): has 4 bytes of transport codes after header."""
+        import hashlib
+
+        # Header 0x10 = route=TRANSPORT_FLOOD(0), payload_type=4: (4<<2)|0 = 0x10
+        transport_codes = b"\x01\x02\x03\x04"
+        payload = b"\xca\xfe"
+        raw = bytes([0x10]) + transport_codes + bytes([0x00]) + payload
+        result = _calculate_packet_hash(raw)
+
+        expected = hashlib.sha256(bytes([4]) + payload).hexdigest()[:16].upper()
+        assert result == expected
+
+    def test_transport_direct_skips_transport_codes(self):
+        """TRANSPORT_DIRECT (0x03): also has 4 bytes of transport codes."""
+        import hashlib
+
+        # Header 0x13 = route=TRANSPORT_DIRECT(3), payload_type=4: (4<<2)|3 = 0x13
+        transport_codes = b"\x05\x06\x07\x08"
+        payload = b"\xbe\xef"
+        raw = bytes([0x13]) + transport_codes + bytes([0x00]) + payload
+        result = _calculate_packet_hash(raw)
+
+        expected = hashlib.sha256(bytes([4]) + payload).hexdigest()[:16].upper()
+        assert result == expected
+
+    def test_trace_packet_includes_path_len_in_hash(self):
+        """TRACE packets (type 9) include path_len as uint16_t LE in the hash."""
+        import hashlib
+
+        # Header for TRACE with FLOOD route: (9<<2)|1 = 0x25
+        path_len = 3
+        path_data = b"\xaa\xbb\xcc"
+        payload = b"\x01\x02"
+        raw = bytes([0x25, path_len]) + path_data + payload
+        result = _calculate_packet_hash(raw)
+
+        expected_hash = (
+            hashlib.sha256(bytes([9]) + path_len.to_bytes(2, byteorder="little") + payload)
+            .hexdigest()[:16]
+            .upper()
+        )
+        assert result == expected_hash
+
+    def test_with_path_data(self):
+        """Packet with non-zero path_len should skip path bytes to reach payload."""
+        import hashlib
+
+        # FLOOD route, payload_type=2 (TXT_MSG): (2<<2)|1 = 0x09
+        path_data = b"\xaa\xbb"  # 2 bytes of path
+        payload = b"\x48\x65\x6c\x6c\x6f"  # "Hello"
+        raw = bytes([0x09, 0x02]) + path_data + payload
+        result = _calculate_packet_hash(raw)
+
+        expected = hashlib.sha256(bytes([2]) + payload).hexdigest()[:16].upper()
+        assert result == expected
+
+    def test_truncated_packet_returns_zeroes(self):
+        # Header says TRANSPORT_FLOOD, but missing path_len at required offset.
+        raw = bytes([0x10, 0x01, 0x02])
+        assert _calculate_packet_hash(raw) == "0" * 16
+
+
+class TestCommunityMqttPublisher:
+    def test_initial_state(self):
+        pub = CommunityMqttPublisher()
+        assert pub.connected is False
+        assert pub._client is None
+        assert pub._task is None
+
+    @pytest.mark.asyncio
+    async def test_publish_drops_when_disconnected(self):
+        pub = CommunityMqttPublisher()
+        # Should not raise
+        await pub.publish("topic", {"key": "value"})
+
+    @pytest.mark.asyncio
+    async def test_stop_resets_state(self):
+        pub = CommunityMqttPublisher()
+        pub.connected = True
+        pub._client = MagicMock()
+        await pub.stop()
+        assert pub.connected is False
+        assert pub._client is None
+
+    def test_is_configured_false_when_disabled(self):
+        pub = CommunityMqttPublisher()
+        pub._settings = AppSettings(community_mqtt_enabled=False)
+        with patch("app.keystore.has_private_key", return_value=True):
+            assert pub._is_configured() is False
+
+    def test_is_configured_false_when_no_private_key(self):
+        pub = CommunityMqttPublisher()
+        pub._settings = AppSettings(community_mqtt_enabled=True)
+        with patch("app.keystore.has_private_key", return_value=False):
+            assert pub._is_configured() is False
+
+    def test_is_configured_true_when_enabled_with_key(self):
+        pub = CommunityMqttPublisher()
+        pub._settings = AppSettings(community_mqtt_enabled=True)
+        with patch("app.keystore.has_private_key", return_value=True):
+            assert pub._is_configured() is True
+
+
+class TestCommunityMqttBroadcast:
+    def test_filters_non_raw_packet(self):
+        """Non-raw_packet events should be ignored."""
+        with patch("app.community_mqtt.community_publisher") as mock_pub:
+            mock_pub.connected = True
+            mock_pub._settings = AppSettings(community_mqtt_enabled=True)
+            community_mqtt_broadcast("message", {"text": "hello"})
+            # No asyncio.create_task should be called for non-raw_packet events
+            # Since we're filtering, we just verify no exception
+
+    def test_skips_when_disconnected(self):
+        """Should not publish when disconnected."""
+        with (
+            patch("app.community_mqtt.community_publisher") as mock_pub,
+            patch("app.community_mqtt.asyncio.create_task") as mock_task,
+        ):
+            mock_pub.connected = False
+            mock_pub._settings = AppSettings(community_mqtt_enabled=True)
+            community_mqtt_broadcast("raw_packet", {"data": "00"})
+            mock_task.assert_not_called()
+
+    def test_skips_when_settings_none(self):
+        """Should not publish when settings are None."""
+        with (
+            patch("app.community_mqtt.community_publisher") as mock_pub,
+            patch("app.community_mqtt.asyncio.create_task") as mock_task,
+        ):
+            mock_pub.connected = True
+            mock_pub._settings = None
+            community_mqtt_broadcast("raw_packet", {"data": "00"})
+            mock_task.assert_not_called()
+
+
+class TestParseBrokerAddress:
+    def test_hostname_only_uses_default_port(self):
+        host, port = _parse_broker_address("mqtt-us-v1.letsmesh.net")
+        assert host == "mqtt-us-v1.letsmesh.net"
+        assert port == _DEFAULT_PORT
+
+    def test_hostname_with_port(self):
+        host, port = _parse_broker_address("mqtt-us-v1.letsmesh.net:8883")
+        assert host == "mqtt-us-v1.letsmesh.net"
+        assert port == 8883
+
+    def test_hostname_with_port_443(self):
+        host, port = _parse_broker_address("broker.example.com:443")
+        assert host == "broker.example.com"
+        assert port == 443
+
+    def test_invalid_port_uses_default(self):
+        host, port = _parse_broker_address("broker.example.com:abc")
+        assert host == "broker.example.com:abc"
+        assert port == _DEFAULT_PORT
+
+    def test_empty_string(self):
+        host, port = _parse_broker_address("")
+        assert host == ""
+        assert port == _DEFAULT_PORT
+
+
+class TestPublishFailureSetsDisconnected:
+    @pytest.mark.asyncio
+    async def test_publish_error_sets_connected_false(self):
+        """A publish error should set connected=False so the loop can detect it."""
+        pub = CommunityMqttPublisher()
+        pub.connected = True
+        mock_client = MagicMock()
+        mock_client.publish = MagicMock(side_effect=Exception("broker gone"))
+        pub._client = mock_client
+        await pub.publish("topic", {"data": "test"})
+        assert pub.connected is False

tests/test_migrations.py

@@ -100,8 +100,8 @@ class TestMigration001:
             # Run migrations
             applied = await run_migrations(conn)
 
-            assert applied == 31  # All migrations run
-            assert await get_version(conn) == 31
+            assert applied == 32  # All migrations run
+            assert await get_version(conn) == 32
 
             # Verify columns exist by inserting and selecting
             await conn.execute(
@@ -183,9 +183,9 @@ class TestMigration001:
             applied1 = await run_migrations(conn)
             applied2 = await run_migrations(conn)
 
-            assert applied1 == 31  # All migrations run
+            assert applied1 == 32  # All migrations run
             assert applied2 == 0  # No migrations on second run
-            assert await get_version(conn) == 31
+            assert await get_version(conn) == 32
         finally:
             await conn.close()
 
@@ -246,8 +246,8 @@ class TestMigration001:
             applied = await run_migrations(conn)
 
             # All migrations applied (version incremented) but no error
-            assert applied == 31
-            assert await get_version(conn) == 31
+            assert applied == 32
+            assert await get_version(conn) == 32
         finally:
             await conn.close()
 
@@ -374,10 +374,10 @@ class TestMigration013:
             )
             await conn.commit()
 
-            # Run migration 13 (plus 14-27 which also run)
+            # Run migration 13 (plus 14-33 which also run)
             applied = await run_migrations(conn)
-            assert applied == 19
-            assert await get_version(conn) == 31
+            assert applied == 20
+            assert await get_version(conn) == 32
 
             # Verify bots array was created with migrated data
             cursor = await conn.execute("SELECT bots FROM app_settings WHERE id = 1")
@@ -497,7 +497,7 @@ class TestMigration018:
             assert await cursor.fetchone() is not None
 
             await run_migrations(conn)
-            assert await get_version(conn) == 31
+            assert await get_version(conn) == 32
 
             # Verify autoindex is gone
             cursor = await conn.execute(
@@ -575,8 +575,8 @@ class TestMigration018:
             await conn.commit()
 
             applied = await run_migrations(conn)
-            assert applied == 14  # Migrations 18-31 run (18+19 skip internally)
-            assert await get_version(conn) == 31
+            assert applied == 15  # Migrations 18-32 run (18+19 skip internally)
+            assert await get_version(conn) == 32
         finally:
             await conn.close()
 
@@ -648,7 +648,7 @@ class TestMigration019:
             assert await cursor.fetchone() is not None
 
             await run_migrations(conn)
-            assert await get_version(conn) == 31
+            assert await get_version(conn) == 32
 
             # Verify autoindex is gone
             cursor = await conn.execute(
@@ -714,8 +714,8 @@ class TestMigration020:
             assert (await cursor.fetchone())[0] == "delete"
 
             applied = await run_migrations(conn)
-            assert applied == 12  # Migrations 20-31
-            assert await get_version(conn) == 31
+            assert applied == 13  # Migrations 20-32
+            assert await get_version(conn) == 32
 
             # Verify WAL mode
             cursor = await conn.execute("PRAGMA journal_mode")
@@ -745,7 +745,7 @@ class TestMigration020:
             await set_version(conn, 20)
 
             applied = await run_migrations(conn)
-            assert applied == 11  # Migrations 21-31 still run
+            assert applied == 12  # Migrations 21-32 still run
 
             # Still WAL + INCREMENTAL
             cursor = await conn.execute("PRAGMA journal_mode")
@@ -803,8 +803,8 @@ class TestMigration028:
             await conn.commit()
 
             applied = await run_migrations(conn)
-            assert applied == 4
-            assert await get_version(conn) == 31
+            assert applied == 5
+            assert await get_version(conn) == 32
 
             # Verify payload_hash column is now BLOB
             cursor = await conn.execute("PRAGMA table_info(raw_packets)")
@@ -873,8 +873,8 @@ class TestMigration028:
             await conn.commit()
 
             applied = await run_migrations(conn)
-            assert applied == 4  # Version still bumped
-            assert await get_version(conn) == 31
+            assert applied == 5  # Version still bumped
+            assert await get_version(conn) == 32
 
             # Verify data unchanged
             cursor = await conn.execute("SELECT payload_hash FROM raw_packets")
@@ -882,3 +882,60 @@ class TestMigration028:
             assert bytes(row["payload_hash"]) == b"\xab" * 32
         finally:
             await conn.close()
+
+
+class TestMigration032:
+    """Test migration 032: add community MQTT columns to app_settings."""
+
+    @pytest.mark.asyncio
+    async def test_migration_adds_all_community_mqtt_columns(self):
+        """Migration adds enabled, iata, broker, and email columns."""
+        conn = await aiosqlite.connect(":memory:")
+        conn.row_factory = aiosqlite.Row
+        try:
+            await set_version(conn, 31)
+
+            # Create app_settings without community columns (pre-migration schema)
+            await conn.execute("""
+                CREATE TABLE app_settings (
+                    id INTEGER PRIMARY KEY,
+                    max_radio_contacts INTEGER DEFAULT 200,
+                    favorites TEXT DEFAULT '[]',
+                    auto_decrypt_dm_on_advert INTEGER DEFAULT 0,
+                    sidebar_sort_order TEXT DEFAULT 'recent',
+                    last_message_times TEXT DEFAULT '{}',
+                    preferences_migrated INTEGER DEFAULT 0,
+                    advert_interval INTEGER DEFAULT 0,
+                    last_advert_time INTEGER DEFAULT 0,
+                    bots TEXT DEFAULT '[]',
+                    mqtt_broker_host TEXT DEFAULT '',
+                    mqtt_broker_port INTEGER DEFAULT 1883,
+                    mqtt_username TEXT DEFAULT '',
+                    mqtt_password TEXT DEFAULT '',
+                    mqtt_use_tls INTEGER DEFAULT 0,
+                    mqtt_tls_insecure INTEGER DEFAULT 0,
+                    mqtt_topic_prefix TEXT DEFAULT 'meshcore',
+                    mqtt_publish_messages INTEGER DEFAULT 0,
+                    mqtt_publish_raw_packets INTEGER DEFAULT 0
+                )
+            """)
+            await conn.execute("INSERT INTO app_settings (id) VALUES (1)")
+            await conn.commit()
+
+            applied = await run_migrations(conn)
+            assert applied == 1
+            assert await get_version(conn) == 32
+
+            # Verify all columns exist with correct defaults
+            cursor = await conn.execute(
+                """SELECT community_mqtt_enabled, community_mqtt_iata,
+                          community_mqtt_broker, community_mqtt_email
+                   FROM app_settings WHERE id = 1"""
+            )
+            row = await cursor.fetchone()
+            assert row["community_mqtt_enabled"] == 0
+            assert row["community_mqtt_iata"] == ""
+            assert row["community_mqtt_broker"] == "mqtt-us-v1.letsmesh.net"
+            assert row["community_mqtt_email"] == ""
+        finally:
+            await conn.close()

tests/test_repository.py

@@ -502,6 +502,10 @@ class TestAppSettingsRepository:
                 "mqtt_topic_prefix": "meshcore",
                 "mqtt_publish_messages": 0,
                 "mqtt_publish_raw_packets": 0,
+                "community_mqtt_enabled": 0,
+                "community_mqtt_iata": "",
+                "community_mqtt_broker": "mqtt-us-v1.letsmesh.net",
+                "community_mqtt_email": "",
             }
         )
         mock_conn.execute = AsyncMock(return_value=mock_cursor)

tests/test_settings_router.py

@@ -117,6 +117,78 @@ class TestUpdateSettings:
         assert settings.mqtt_publish_messages is False
         assert settings.mqtt_publish_raw_packets is False
 
+    @pytest.mark.asyncio
+    async def test_community_mqtt_fields_round_trip(self, test_db):
+        """Community MQTT settings should be saved and retrieved correctly."""
+        mock_community = type("MockCommunity", (), {"restart": AsyncMock()})()
+        with patch("app.community_mqtt.community_publisher", mock_community):
+            result = await update_settings(
+                AppSettingsUpdate(
+                    community_mqtt_enabled=True,
+                    community_mqtt_iata="DEN",
+                    community_mqtt_broker="custom-broker.example.com",
+                    community_mqtt_email="test@example.com",
+                )
+            )
+
+        assert result.community_mqtt_enabled is True
+        assert result.community_mqtt_iata == "DEN"
+        assert result.community_mqtt_broker == "custom-broker.example.com"
+        assert result.community_mqtt_email == "test@example.com"
+
+        # Verify persistence
+        fresh = await AppSettingsRepository.get()
+        assert fresh.community_mqtt_enabled is True
+        assert fresh.community_mqtt_iata == "DEN"
+        assert fresh.community_mqtt_broker == "custom-broker.example.com"
+        assert fresh.community_mqtt_email == "test@example.com"
+
+        # Verify restart was called
+        mock_community.restart.assert_called_once()
+
+    @pytest.mark.asyncio
+    async def test_community_mqtt_iata_validation_rejects_invalid(self, test_db):
+        """Invalid IATA codes should be rejected."""
+        with pytest.raises(HTTPException) as exc:
+            await update_settings(AppSettingsUpdate(community_mqtt_iata="A"))
+        assert exc.value.status_code == 400
+
+        with pytest.raises(HTTPException) as exc:
+            await update_settings(AppSettingsUpdate(community_mqtt_iata="ABCDE"))
+        assert exc.value.status_code == 400
+
+        with pytest.raises(HTTPException) as exc:
+            await update_settings(AppSettingsUpdate(community_mqtt_iata="12"))
+        assert exc.value.status_code == 400
+
+        with pytest.raises(HTTPException) as exc:
+            await update_settings(AppSettingsUpdate(community_mqtt_iata="ABCD"))
+        assert exc.value.status_code == 400
+
+    @pytest.mark.asyncio
+    async def test_community_mqtt_enable_requires_iata(self, test_db):
+        """Enabling community MQTT without a valid IATA code should be rejected."""
+        with pytest.raises(HTTPException) as exc:
+            await update_settings(AppSettingsUpdate(community_mqtt_enabled=True))
+        assert exc.value.status_code == 400
+        assert "IATA" in exc.value.detail
+
+    @pytest.mark.asyncio
+    async def test_community_mqtt_iata_uppercased(self, test_db):
+        """IATA codes should be uppercased."""
+        mock_community = type("MockCommunity", (), {"restart": AsyncMock()})()
+        with patch("app.community_mqtt.community_publisher", mock_community):
+            result = await update_settings(AppSettingsUpdate(community_mqtt_iata="den"))
+        assert result.community_mqtt_iata == "DEN"
+
+    @pytest.mark.asyncio
+    async def test_community_mqtt_defaults_on_fresh_db(self, test_db):
+        """Community MQTT fields should have correct defaults on a fresh database."""
+        settings = await AppSettingsRepository.get()
+        assert settings.community_mqtt_enabled is False
+        assert settings.community_mqtt_iata == ""
+        assert settings.community_mqtt_email == ""
+
 
 class TestToggleFavorite:
     @pytest.mark.asyncio