Packet #386097

Database ID:	386097
Mesh Packet ID:	`0xf57fead7` Utilizado para correlação entre gateways
Tempo:	2025-10-16 21:10:21 UTC
Do Node:	LUNATIC (LNTC)
Para o Node:	!ffffffff (ffff)
Successo:	Processado
Protocolo:	POSITION_APP Port: 3

Gateway:	Fama17-GT-8-PT (F17)
Canal:	LongFast
RSSI:	-120 dBm
SNR:	-10.0 dBm
Info Hop:	5/5 hops Início: 5, Limite: 0

Latitude:	42.598400°
Longitude:	-7.523533°
Altitude:	502 m
Precisão:	13 bits

Raw Packet Analysis

Complete field breakdown and MQTT privacy/exposure analysis

Packet Structure

MQTT Packet Flow:
ServiceEnvelope (MQTT layer) → MeshPacket (Mesh layer) → Decoded Payload (Application data)

Total Size:	38 bytes
Gateway:	!13296f2c
Channel:	LongFast
Payload Type:	POSITION_APP
Hop Count:	5 / 5

Privacy Summary

Exposure Level:
Broadcast

Privacy Features:
✓ Direct LoRa transmission (not via MQTT)
✓ Gateway node ID tracked
+ 1 more...

Exposure Risks:
⚠ Visible to all nodes on channel
⚠ Default channel - no encryption
+ 3 more...

MQTT ServiceEnvelope Fields

MQTT ServiceEnvelope contains the MeshPacket plus routing metadata

Field	Value
`gateway_id`	`!13296f2c` Node ID format
`channel_id`	`LongFast` Default public channel
`packet`	`MeshPacket` (38 bytes) Contains the actual mesh network packet

MeshPacket Fields

Core mesh packet with routing and payload information

Field	Value	Type
`from`	`2666111484` Source node ID	uint32
`to`	`4294967295` (Broadcast) Visible to all nodes	uint32
`decoded.portnum`	`3` POSITION_APP	enum
`decoded.payload_length`	`38` bytes	size
`hop_limit`	Not set	uint32
`hop_start`	`5` Initial hop limit	uint32
`hops_taken`	`5` Calculated: hop_start - hop_limit	derived
`rx_rssi`	`-120.0` dBm Signal strength at gateway	int32
`rx_snr`	`-10.00` dB Signal quality at gateway	float
`rx_time`	`1760645420` Receive timestamp	fixed32
`via_mqtt`	False Direct LoRa transmission	bool
`want_ack`	False No ACK requested	bool
`priority`	Not set	enum
`delayed`	Not set	enum
`channel`	Not set	uint32
`pki_encrypted`	False Standard encryption	bool
`next_hop`	Not set	uint32
`relay_node`	`146` Relay node ID	uint32
`tx_after`	Not set	uint32
`timestamp`	`1760645421.35982` Unix timestamp	uint32

MQTT Privacy & Exposure Analysis

Analysis of privacy features and exposure risks when packet is shared via MQTT

Exposure Level: Broadcast

Privacy Features:

✓ Direct LoRa transmission (not via MQTT)
✓ Gateway node ID tracked
✓ Reduced position precision: ~2900.0m accuracy

Exposure Risks:

⚠ Visible to all nodes on channel
⚠ Default channel - no encryption
⚠ Packet visible to MQTT subscribers
⚠ Multi-hop path visible (5 hops)
⚠ RF signal metrics exposed (location inference possible)

MQTT-Specific Fields

Gateway ID:	`!13296f2c`
Position Precision:	13 bits (~2900.0m accuracy)
Position precision meters:	`2900.0`
Signal Metrics:	RSSI: -120.0 dBm SNR: -10.00 dB

Complete Payload Analysis

Detailed breakdown of all payload fields and decoded data

Payload Metadata:

Protocol:	POSITION_APP
Size:	38 bytes
Decoded:	Yes

Complete Payload Data (JSON):

{ "latitude": 42.5984, "longitude": -7.5235328, "altitude": 502, "sats_in_view": null, "precision_bits": 13 }

Complete Protobuf Decode (JSON)

{ "service_envelope": { "gateway_id": "!13296f2c", "channel_id": "LongFast", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 2666111484, "to": 4294967295, "id": 4118801111, "rx_time": 1760645420, "rx_snr": -10.0, "rx_rssi": -120, "hop_limit": 0, "hop_start": 5, "via_mqtt": 0, "want_ack": 0, "priority": 0, "delayed": 0, "channel_index": null, "pki_encrypted": 0, "next_hop": 0, "relay_node": 146, "tx_after": 0, "decoded": { "portnum": 3, "payload": "0d0000641915000084fb18f603252151f16828013d2517f16850007800800100b0013eb8010d", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "latitude_i": 425984000, "longitude_i": -75235328, "altitude": 502, "time": 1760645409, "location_source": "LOC_MANUAL", "timestamp": 1760630565, "altitude_geoidal_separation": 0, "ground_speed": 0, "ground_track": 0, "seq_number": 62, "precision_bits": 13, "type": "protobuf", "portnum": "POSITION_APP", "message_class": "Position" } } } }

Raw Packet Data (38 bytes)

0d0000641915000084fb18f603252151f16828013d2517f16850007800800100b0013eb8010d

Hex Analysis:

Size:	38 bytes
Format:	Protobuf (Protocol Buffers)
Encoding:	Binary with varint and length-delimited fields

This is the raw protobuf-encoded payload as received from MQTT. The structure follows the Meshtastic protobuf schema definitions.

Pacote #386097 Successo

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