Packet #24390

Database ID:	24390
Mesh Packet ID:	`0x4e13e19d` Utilizado para correlação entre gateways
Tempo:	2025-09-26 04:56:58 UTC
Do Node:	Javi 62e0 (Javi)
Para o Node:	!ffffffff (ffff)
Successo:	Processado
Protocolo:	POSITION_APP Port: 3

Gateway:	monteburgos2-CL-8 (mtb)
Canal:	LongFast
RSSI:	-118 dBm
SNR:	-17.5 dBm
Info Hop:	3/3 hops Início: 3, Limite: 0

Latitude:	42.074112°
Longitude:	-7.785677°
Altitude:	640 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:	29 bytes
Gateway:	!db2b5994
Channel:	LongFast
Payload Type:	POSITION_APP
Hop Count:	3 / 3

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`	`!db2b5994` Node ID format
`channel_id`	`LongFast` Default public channel
`packet`	`MeshPacket` (29 bytes) Contains the actual mesh network packet

MeshPacket Fields

Core mesh packet with routing and payload information

Field	Value	Type
`from`	`2697683680` Source node ID	uint32
`to`	`4294967295` (Broadcast) Visible to all nodes	uint32
`decoded.portnum`	`3` POSITION_APP	enum
`decoded.payload_length`	`29` bytes	size
`hop_limit`	Not set	uint32
`hop_start`	`3` Initial hop limit	uint32
`hops_taken`	`3` Calculated: hop_start - hop_limit	derived
`rx_rssi`	`-118.0` dBm Signal strength at gateway	int32
`rx_snr`	`-17.50` dB Signal quality at gateway	float
`rx_time`	`1758859017` 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`	`1758859018.570258` 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 (3 hops)
⚠ RF signal metrics exposed (location inference possible)

MQTT-Specific Fields

Gateway ID:	`!db2b5994`
Position Precision:	13 bits (~2900.0m accuracy)
Position precision meters:	`2900.0`
Signal Metrics:	RSSI: -118.0 dBm SNR: -17.50 dB

Complete Payload Analysis

Detailed breakdown of all payload fields and decoded data

Payload Metadata:

Protocol:	POSITION_APP
Size:	29 bytes
Decoded:	Yes

Complete Payload Data (JSON):

{ "latitude": 42.074112, "longitude": -7.7856768, "altitude": 640, "sats_in_view": null, "precision_bits": 13 }

Complete Protobuf Decode (JSON)

{ "service_envelope": { "gateway_id": "!db2b5994", "channel_id": "LongFast", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 2697683680, "to": 4294967295, "id": 1309925789, "rx_time": 1758859017, "rx_snr": -17.5, "rx_rssi": -118, "hop_limit": 0, "hop_start": 3, "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": "0d000014191500005cfb18800525fa0ed668280378028001d601b8010d", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "latitude_i": 420741120, "longitude_i": -77856768, "altitude": 640, "time": 1758859002, "location_source": "LOC_EXTERNAL", "ground_speed": 2, "ground_track": 214, "precision_bits": 13, "type": "protobuf", "portnum": "POSITION_APP", "message_class": "Position" } } } }

Raw Packet Data (29 bytes)

0d000014191500005cfb18800525fa0ed668280378028001d601b8010d

Hex Analysis:

Size:	29 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 #24390 Successo

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