Packet #1841365

Database ID:	1841365
Mesh Packet ID:	`0xff3249b2` Used for correlation across gateways
Timestamp:	2025-06-25 21:14:17 UTC
From Node:	Th@ (📡)
To Node:	!ffffffff (ffff)
Success:	Processed
Protocol:	POSITION_APP Port: 3

Gateway:	JSG0 (f33e)
Channel:	LongFast
RSSI:	-127 dBm
SNR:	-18.75 dBm
Hop Info:	2/7 hops Start: 7, Limit: 5

Latitude:	39.636173°
Longitude:	-0.209715°
Altitude:	14 m
Precision:	10 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:	27 bytes
Gateway:	!947df33e
Channel:	LongFast
Payload Type:	POSITION_APP
Hop Count:	2 / 7

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`	`!947df33e` Node ID format
`channel_id`	`LongFast` Default public channel
`packet`	`MeshPacket` (27 bytes) Contains the actual mesh network packet

MeshPacket Fields

Core mesh packet with routing and payload information

Field	Value	Type
`from`	`4184513404` Source node ID	uint32
`to`	`4294967295` (Broadcast) Visible to all nodes	uint32
`decoded.portnum`	`3` POSITION_APP	enum
`decoded.payload_length`	`27` bytes	size
`hop_limit`	`5` Remaining hops allowed	uint32
`hop_start`	`7` Initial hop limit	uint32
`hops_taken`	`2` Calculated: hop_start - hop_limit	derived
`rx_rssi`	`-127.0` dBm Signal strength at gateway	int32
`rx_snr`	`-18.75` dB Signal quality at gateway	float
`rx_time`	`1750884871` 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`	`211` Relay node ID	uint32
`tx_after`	Not set	uint32
`timestamp`	`1750886057.835676` 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: ~23300.0m accuracy

Exposure Risks:

⚠ Visible to all nodes on channel
⚠ Default channel - no encryption
⚠ Packet visible to MQTT subscribers
⚠ Multi-hop path visible (2 hops)
⚠ RF signal metrics exposed (location inference possible)

MQTT-Specific Fields

Gateway ID:	`!947df33e`
Position Precision:	10 bits (~23300.0m accuracy)
Position precision meters:	`23300.0`
Signal Metrics:	RSSI: -127.0 dBm SNR: -18.75 dB

Complete Payload Analysis

Detailed breakdown of all payload fields and decoded data

Payload Metadata:

Protocol:	POSITION_APP
Size:	27 bytes
Decoded:	Yes

Complete Payload Data (JSON):

{ "latitude": 39.6361728, "longitude": -0.2097152, "altitude": 14, "sats_in_view": null, "precision_bits": 10 }

Complete Protobuf Decode (JSON)

{ "service_envelope": { "gateway_id": "!947df33e", "channel_id": "LongFast", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 4184513404, "to": 4294967295, "id": 4281485746, "rx_time": 1750884871, "rx_snr": -18.75, "rx_rssi": -127, "hop_limit": 5, "hop_start": 7, "via_mqtt": 0, "want_ack": 0, "priority": 0, "delayed": 0, "channel_index": null, "pki_encrypted": 0, "next_hop": 0, "relay_node": 211, "tx_after": 0, "decoded": { "portnum": 3, "payload": "0d0000a017150000e0ff180e250d625c6828017800800100b8010a", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "latitude_i": 396361728, "longitude_i": -2097152, "altitude": 14, "time": 1750884877, "location_source": "LOC_MANUAL", "ground_speed": 0, "ground_track": 0, "precision_bits": 10, "type": "protobuf", "portnum": "POSITION_APP", "message_class": "Position" } } } }

Raw Packet Data (27 bytes)

0d0000a017150000e0ff180e250d625c6828017800800100b8010a

Hex Analysis:

Size:	27 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 #1841365 Success

Packet Information

Payload Data

Decoded Data: