Packet #2811386

Database ID:	2811386
Mesh Packet ID:	`0x67111b66` Used for correlation across gateways
Timestamp:	2025-07-04 18:05:05 UTC
From Node:	Meshtastic 9fbd (9fbd)
To Node:	!ffffffff (ffff)
Success:	Processed
Protocol:	POSITION_APP Port: 3

Gateway:	Vich 📟🌐 (VCH)
Channel:	LongFast
RSSI:	-128 dBm
SNR:	-19.5 dBm
Hop Info:	0/3 hops Start: 3, Limit: 3

Latitude:	40.468480°
Longitude:	-3.689677°
Altitude:	753 m
Satellites:	8
Precision:	15 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:	37 bytes
Gateway:	!db2f1134
Channel:	LongFast
Payload Type:	POSITION_APP
Hop Count:	Unknown / 3

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`	`!db2f1134` Node ID format
`channel_id`	`LongFast` Default public channel
`packet`	`MeshPacket` (37 bytes) Contains the actual mesh network packet

MeshPacket Fields

Core mesh packet with routing and payload information

Field	Value	Type
`from`	`3553730493` Source node ID	uint32
`to`	`4294967295` (Broadcast) Visible to all nodes	uint32
`decoded.portnum`	`3` POSITION_APP	enum
`decoded.payload_length`	`37` bytes	size
`hop_limit`	`3` Remaining hops allowed	uint32
`hop_start`	`3` Initial hop limit	uint32
`hops_taken`	`0` Calculated: hop_start - hop_limit	derived
`rx_rssi`	`-128.0` dBm Signal strength at gateway	int32
`rx_snr`	`-19.50` dB Signal quality at gateway	float
`rx_time`	`1751652304` 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`	`189` Relay node ID	uint32
`tx_after`	Not set	uint32
`timestamp`	`1751652305.7740738` 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: ~729.0m 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:	`!db2f1134`
Position Precision:	15 bits (~729.0m accuracy)
Position precision meters:	`729.0`
Zero Hop Policy:	Enabled Direct gateway connection
Signal Metrics:	RSSI: -128.0 dBm SNR: -19.50 dB

Complete Payload Analysis

Detailed breakdown of all payload fields and decoded data

Payload Metadata:

Protocol:	POSITION_APP
Size:	37 bytes
Decoded:	Yes

Complete Payload Data (JSON):

{ "latitude": 40.46848, "longitude": -3.6896768, "altitude": 753, "sats_in_view": 8, "precision_bits": 15 }

Complete Protobuf Decode (JSON)

{ "service_envelope": { "gateway_id": "!db2f1134", "channel_id": "LongFast", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 3553730493, "to": 4294967295, "id": 1729174374, "rx_time": 1751652304, "rx_snr": -19.5, "rx_rssi": -128, "hop_limit": 3, "hop_start": 3, "via_mqtt": 0, "want_ack": 0, "priority": 0, "delayed": 0, "channel_index": null, "pki_encrypted": 0, "next_hop": 0, "relay_node": 189, "tx_after": 0, "decoded": { "portnum": 3, "payload": "0d00001f18150000cdfd18f10525d0176868280258b70278008001d8f5bb0f980108b8010f", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "latitude_i": 404684800, "longitude_i": -36896768, "altitude": 753, "time": 1751652304, "location_source": "LOC_INTERNAL", "PDOP": 311, "ground_speed": 0, "ground_track": 32439000, "sats_in_view": 8, "precision_bits": 15, "type": "protobuf", "portnum": "POSITION_APP", "message_class": "Position" } } } }

Raw Packet Data (37 bytes)

0d00001f18150000cdfd18f10525d0176868280258b70278008001d8f5bb0f980108b8010f

Hex Analysis:

Size:	37 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 #2811386 Success

Packet Information

Payload Data

Decoded Data: