Packet #164443

Database ID:	164443
Mesh Packet ID:	`0x9d16ffbb` Utilizado para correlação entre gateways
Tempo:	2025-10-03 21:37:54 UTC
Do Node:	!4b368126 (8126)
Para o Node:	EB1EMB (snv0)
Successo:	Processado
Protocolo:	POSITION_APP Port: 3

Gateway:	ℹ️(Meshtastic.pt)-GW-868🇵🇹 (BIG4)
Canal:	LongFast
RSSI:	-82 dBm
SNR:	5.75 dBm
Info Hop:	4/4 hops Início: 4, Limite: 0

Latitude:	42.886758°
Longitude:	-7.864320°
Altitude:	780 m
Precisão:	11 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:	18 bytes
Gateway:	!ba61d134
Channel:	LongFast
Payload Type:	POSITION_APP
Hop Count:	4 / 4

Privacy Summary

Exposure Level:
Direct Message

Privacy Features:
✓ Direct LoRa transmission (not via MQTT)
✓ Targeted to specific node
+ 2 more...

Exposure Risks:
⚠ Default channel - no encryption
⚠ Packet visible to MQTT subscribers
+ 2 more...

MQTT ServiceEnvelope Fields

MQTT ServiceEnvelope contains the MeshPacket plus routing metadata

Field	Value
`gateway_id`	`!ba61d134` Node ID format
`channel_id`	`LongFast` Default public channel
`packet`	`MeshPacket` (18 bytes) Contains the actual mesh network packet

MeshPacket Fields

Core mesh packet with routing and payload information

Field	Value	Type
`from`	`1261863206` Source node ID	uint32
`to`	`3326911508` Target node ID	uint32
`decoded.portnum`	`3` POSITION_APP	enum
`decoded.payload_length`	`18` bytes	size
`hop_limit`	Not set	uint32
`hop_start`	`4` Initial hop limit	uint32
`hops_taken`	`4` Calculated: hop_start - hop_limit	derived
`rx_rssi`	`-82.0` dBm Signal strength at gateway	int32
`rx_snr`	`5.75` dB Signal quality at gateway	float
`rx_time`	`1759523873` 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`	`54` Relay node ID	uint32
`tx_after`	Not set	uint32
`timestamp`	`1759523874.185806` Unix timestamp	uint32

MQTT Privacy & Exposure Analysis

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

Exposure Level: Direct Message

Privacy Features:

✓ Direct LoRa transmission (not via MQTT)
✓ Targeted to specific node
✓ Gateway node ID tracked
✓ Reduced position precision: ~11700.0m accuracy

Exposure Risks:

⚠ Default channel - no encryption
⚠ Packet visible to MQTT subscribers
⚠ Multi-hop path visible (4 hops)
⚠ RF signal metrics exposed (location inference possible)

MQTT-Specific Fields

Gateway ID:	`!ba61d134`
Position Precision:	11 bits (~11700.0m accuracy)
Position precision meters:	`11700.0`
Signal Metrics:	RSSI: -82.0 dBm SNR: 5.75 dB

Complete Payload Analysis

Detailed breakdown of all payload fields and decoded data

Payload Metadata:

Protocol:	POSITION_APP
Size:	18 bytes
Decoded:	Yes

Complete Payload Data (JSON):

{ "latitude": 42.8867584, "longitude": -7.86432, "altitude": 780, "sats_in_view": null, "precision_bits": 11 }

Complete Protobuf Decode (JSON)

{ "service_envelope": { "gateway_id": "!ba61d134", "channel_id": "LongFast", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 1261863206, "to": 3326911508, "id": 2635530171, "rx_time": 1759523873, "rx_snr": 5.75, "rx_rssi": -82, "hop_limit": 0, "hop_start": 4, "via_mqtt": 0, "want_ack": 0, "priority": 0, "delayed": 0, "channel_index": null, "pki_encrypted": 0, "next_hop": 0, "relay_node": 54, "tx_after": 0, "decoded": { "portnum": 3, "payload": "0d0000901915000050fb188c062801b8010b", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "latitude_i": 428867584, "longitude_i": -78643200, "altitude": 780, "location_source": "LOC_MANUAL", "precision_bits": 11, "type": "protobuf", "portnum": "POSITION_APP", "message_class": "Position" } } } }

Raw Packet Data (18 bytes)

0d0000901915000050fb188c062801b8010b

Hex Analysis:

Size:	18 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 #164443 Successo

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