Packet #1151331

Database ID:	1151331
Mesh Packet ID:	`0xd77ae7b7` Used for correlation across gateways
Timestamp:	2025-10-23 19:57:37 UTC
From Node:	Frodis G2 (chimesh.org) (🐸)
To Node:	!ffffffff (ffff)
Success:	Processed
Protocol:	POSITION_APP Port: 3

Gateway:	dkTower (🛕)
Channel:	LongFast
RSSI:	-63 dBm
SNR:	4.0 dBm
Hop Info:	0/4 hops Start: 4, Limit: 4
Relay Node:	`70` 🐸 Last byte of the last hop that relayed this packet - Candidate source node(s) based on 0-hop direct receptions

Latitude:	41.877504°
Longitude:	-87.621632°
Altitude:	282 m
Precision:	14 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:	28 bytes
Gateway:	!32299c05
Channel:	LongFast
Payload Type:	POSITION_APP
Hop Count:	Unknown / 4

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`	`!32299c05` Node ID format
`channel_id`	`LongFast` Default public channel
`packet`	`MeshPacket` (28 bytes) Contains the actual mesh network packet

MeshPacket Fields

Core mesh packet with routing and payload information

Field	Value	Type
`from`	`2718629488` Source node ID	uint32
`to`	`4294967295` (Broadcast) Visible to all nodes	uint32
`decoded.portnum`	`3` POSITION_APP	enum
`decoded.payload_length`	`28` bytes	size
`hop_limit`	`4` Remaining hops allowed	uint32
`hop_start`	`4` Initial hop limit	uint32
`hops_taken`	`0` Calculated: hop_start - hop_limit	derived
`rx_rssi`	`-63.0` dBm Signal strength at gateway	int32
`rx_snr`	`4.00` dB Signal quality at gateway	float
`rx_time`	`1761247602` 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`	`112` Relay node ID	uint32
`tx_after`	Not set	uint32
`timestamp`	`1761249457.003647` 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: ~1500.0m 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:	`!32299c05`
Position Precision:	14 bits (~1500.0m accuracy)
Position precision meters:	`1500.0`
Zero Hop Policy:	Enabled Direct gateway connection
Signal Metrics:	RSSI: -63.0 dBm SNR: 4.00 dB

Complete Payload Analysis

Detailed breakdown of all payload fields and decoded data

Payload Metadata:

Protocol:	POSITION_APP
Size:	28 bytes
Decoded:	Yes

Complete Payload Data (JSON):

{ "latitude": 41.877504, "longitude": -87.621632, "altitude": 282, "sats_in_view": null, "precision_bits": 14 }

Complete Protobuf Decode (JSON)

{ "service_envelope": { "gateway_id": "!32299c05", "channel_id": "LongFast", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 2718629488, "to": 4294967295, "id": 3615156151, "rx_time": 1761247602, "rx_snr": 4.0, "rx_rssi": -63, "hop_limit": 4, "hop_start": 4, "via_mqtt": 0, "want_ack": 0, "priority": 0, "delayed": 0, "channel_index": null, "pki_encrypted": 0, "next_hop": 0, "relay_node": 112, "tx_after": 0, "decoded": { "portnum": 3, "payload": "0d0000f618150000c6cb189a02257b81fa6828017800800100b8010e", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "latitude_i": 418775040, "longitude_i": -876216320, "altitude": 282, "time": 1761247611, "location_source": "LOC_MANUAL", "ground_speed": 0, "ground_track": 0, "precision_bits": 14, "type": "protobuf", "portnum": "POSITION_APP", "message_class": "Position" } } } }

Raw Packet Data (28 bytes)

0d0000f618150000c6cb189a02257b81fa6828017800800100b8010e

Hex Analysis:

Size:	28 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 #1151331 Success

Packet Information

Payload Data

Decoded Data: