Packet #1654780

Database ID:	1654780
Mesh Packet ID:	`0x631b27fb` Used for correlation across gateways
Timestamp:	2025-06-23 17:40:24 UTC
From Node:	RadioPrepper-TRK-868 (RdPr)
To Node:	SPA3NF-CL-868 📡 (SPA3)
Success:	Processed
Protocol:	POSITION_APP Port: 3

Gateway:	MontcadaCentro-CL-868🗼🌐 (d9e8)
Channel:	LongFast
RSSI:	-117 dBm
SNR:	-13.75 dBm
Hop Info:	0/2 hops Start: 2, Limit: 2

Latitude:	41.482650°
Longitude:	2.183987°
Altitude:	70 m
Satellites:	12
Precision:	17 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:	35 bytes
Gateway:	!e00cd9e8
Channel:	LongFast
Payload Type:	POSITION_APP
Hop Count:	Unknown / 2

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`	`!e00cd9e8` Node ID format
`channel_id`	`LongFast` Default public channel
`packet`	`MeshPacket` (35 bytes) Contains the actual mesh network packet

MeshPacket Fields

Core mesh packet with routing and payload information

Field	Value	Type
`from`	`2173456321` Source node ID	uint32
`to`	`528557523` Target node ID	uint32
`decoded.portnum`	`3` POSITION_APP	enum
`decoded.payload_length`	`35` bytes	size
`hop_limit`	`2` Remaining hops allowed	uint32
`hop_start`	`2` Initial hop limit	uint32
`hops_taken`	`0` Calculated: hop_start - hop_limit	derived
`rx_rssi`	`-117.0` dBm Signal strength at gateway	int32
`rx_snr`	`-13.75` dB Signal quality at gateway	float
`rx_time`	`1750700422` 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`	`193` Relay node ID	uint32
`tx_after`	Not set	uint32
`timestamp`	`1750700424.615954` 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
✓ Zero-hop: direct from source to MQTT gateway

Exposure Risks:

⚠ Default channel - no encryption
⚠ Packet visible to MQTT subscribers
⚠ Full GPS precision shared
⚠ RF signal metrics exposed (location inference possible)

MQTT-Specific Fields

Gateway ID:	`!e00cd9e8`
Position Precision:	17 bits (~182.0m accuracy)
Position precision meters:	`182.0`
Zero Hop Policy:	Enabled Direct gateway connection
Signal Metrics:	RSSI: -117.0 dBm SNR: -13.75 dB

Complete Payload Analysis

Detailed breakdown of all payload fields and decoded data

Payload Metadata:

Protocol:	POSITION_APP
Size:	35 bytes
Decoded:	Yes

Complete Payload Data (JSON):

{ "latitude": 41.4826496, "longitude": 2.1839872, "altitude": 70, "sats_in_view": 12, "precision_bits": 17 }

Complete Protobuf Decode (JSON)

{ "service_envelope": { "gateway_id": "!e00cd9e8", "channel_id": "LongFast", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 2173456321, "to": 528557523, "id": 1662724091, "rx_time": 1750700422, "rx_snr": -13.75, "rx_rssi": -117, "hop_limit": 2, "hop_start": 2, "via_mqtt": 0, "want_ack": 0, "priority": 0, "delayed": 0, "channel_index": null, "pki_encrypted": 0, "next_hop": 0, "relay_node": 193, "tx_after": 0, "decoded": { "portnum": 3, "payload": "0d00c0b9181500404d01184625859159682802586f78018001f89cef0b98010cb80111", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "latitude_i": 414826496, "longitude_i": 21839872, "altitude": 70, "time": 1750700421, "location_source": "LOC_INTERNAL", "PDOP": 111, "ground_speed": 1, "ground_track": 24891000, "sats_in_view": 12, "precision_bits": 17, "type": "protobuf", "portnum": "POSITION_APP", "message_class": "Position" } } } }

Raw Packet Data (35 bytes)

0d00c0b9181500404d01184625859159682802586f78018001f89cef0b98010cb80111

Hex Analysis:

Size:	35 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.

Packet #1654780 Success

Packet Information

Payload Data

Decoded Data: