Packet #113671

Database ID:	113671
Mesh Packet ID:	`0x72e5e2c1` Utilizado para correlação entre gateways
Tempo:	2025-10-01 07:12:57 UTC
Do Node:	Cavaco-RCC-CL-8 (CAV)
Para o Node:	!ffffffff (ffff)
Successo:	Processado
Protocolo:	POSITION_APP Port: 3

Gateway:	FARO_Penha-RCC-GW-8 (PNHA)
Canal:	LongFast
RSSI:	-75 dBm
SNR:	5.75 dBm
Info Hop:	0/4 hops Início: 4, Limite: 4

Latitude:	37.027840°
Longitude:	-7.929856°
Altitude:	-19 m
Satelites:	11
Precisão:	14 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:	34 bytes
Gateway:	!c8fc170b
Channel:	LongFast
Payload Type:	POSITION_APP
Hop Count:	Unknown / 4

Privacy Summary

Exposure Level:
Broadcast

Privacy Features:
✓ Direct LoRa transmission (not via MQTT)
✓ Gateway node ID tracked
+ 2 more...

Exposure Risks:
⚠ Visible to all nodes on channel
⚠ Default channel - no encryption
+ 2 more...

MQTT ServiceEnvelope Fields

MQTT ServiceEnvelope contains the MeshPacket plus routing metadata

Field	Value
`gateway_id`	`!c8fc170b` Node ID format
`channel_id`	`LongFast` Default public channel
`packet`	`MeshPacket` (34 bytes) Contains the actual mesh network packet

MeshPacket Fields

Core mesh packet with routing and payload information

Field	Value	Type
`from`	`2839116536` Source node ID	uint32
`to`	`4294967295` (Broadcast) Visible to all nodes	uint32
`decoded.portnum`	`3` POSITION_APP	enum
`decoded.payload_length`	`34` bytes	size
`hop_limit`	`4` Remaining hops allowed	uint32
`hop_start`	`4` Initial hop limit	uint32
`hops_taken`	`0` Calculated: hop_start - hop_limit	derived
`rx_rssi`	`-75.0` dBm Signal strength at gateway	int32
`rx_snr`	`5.75` dB Signal quality at gateway	float
`rx_time`	`1759299175` 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`	`248` Relay node ID	uint32
`tx_after`	Not set	uint32
`timestamp`	`1759299177.1784832` 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: ~1500.0m accuracy
✓ Zero-hop: direct from source to MQTT gateway

Exposure Risks:

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

MQTT-Specific Fields

Gateway ID:	`!c8fc170b`
Position Precision:	14 bits (~1500.0m accuracy)
Position precision meters:	`1500.0`
Zero Hop Policy:	Enabled Direct gateway connection
Signal Metrics:	RSSI: -75.0 dBm SNR: 5.75 dB

Complete Payload Analysis

Detailed breakdown of all payload fields and decoded data

Payload Metadata:

Protocol:	POSITION_APP
Size:	34 bytes
Decoded:	Yes

Complete Payload Data (JSON):

{ "latitude": 37.02784, "longitude": -7.929856, "altitude": -19, "sats_in_view": 11, "precision_bits": 14 }

Complete Protobuf Decode (JSON)

{ "service_envelope": { "gateway_id": "!c8fc170b", "channel_id": "LongFast", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 2839116536, "to": 4294967295, "id": 1927668417, "rx_time": 1759299175, "rx_snr": 5.75, "rx_rssi": -75, "hop_limit": 4, "hop_start": 4, "via_mqtt": 0, "want_ack": 0, "priority": 0, "delayed": 0, "channel_index": null, "pki_encrypted": 0, "next_hop": 0, "relay_node": 248, "tx_after": 0, "decoded": { "portnum": 3, "payload": "0d0000121615000046fb18edffffffffffffffff012579c6dc68280298010bb8010e", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "latitude_i": 370278400, "longitude_i": -79298560, "altitude": -19, "time": 1759299193, "location_source": "LOC_INTERNAL", "sats_in_view": 11, "precision_bits": 14, "type": "protobuf", "portnum": "POSITION_APP", "message_class": "Position" } } } }

Raw Packet Data (34 bytes)

0d0000121615000046fb18edffffffffffffffff012579c6dc68280298010bb8010e

Hex Analysis:

Size:	34 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 #113671 Successo

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