Packet #2245684

Database ID:	2245684
Mesh Packet ID:	`0xc34286d4` Used for correlation across gateways
Timestamp:	2025-06-29 11:21:13 UTC
From Node:	5urb_433Mhz (5urb)
To Node:	!ffffffff (ffff)
Success:	Processed
Protocol:	POSITION_APP Port: 3

Gateway:	Meshtastic 5bbc (5bbc)
Channel:	LongFast
RSSI:	-127 dBm
SNR:	-18.5 dBm
Hop Info:	2/6 hops Start: 6, Limit: 4

Latitude:	38.559512°
Longitude:	-0.102059°
Altitude:	39 m
Precision:	32 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:	!849c5bbc
Channel:	LongFast
Payload Type:	POSITION_APP
Hop Count:	2 / 6

Privacy Summary

Exposure Level:
Broadcast

Privacy Features:
✓ Direct LoRa transmission (not via MQTT)
✓ Gateway node ID tracked

Exposure Risks:
⚠ Visible to all nodes on channel
⚠ Default channel - no encryption
+ 4 more...

MQTT ServiceEnvelope Fields

MQTT ServiceEnvelope contains the MeshPacket plus routing metadata

Field	Value
`gateway_id`	`!849c5bbc` 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`	`2053992852` 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`	`4` Remaining hops allowed	uint32
`hop_start`	`6` 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`	`-18.50` dB Signal quality at gateway	float
`rx_time`	`1751196072` 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`	Not set	uint32
`tx_after`	Not set	uint32
`timestamp`	`1751196073.2968714` 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

Exposure Risks:

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

MQTT-Specific Fields

Gateway ID:	`!849c5bbc`
Position Precision:	32 bits (~1.0m accuracy)
Position precision meters:	`1.0`
Signal Metrics:	RSSI: -127.0 dBm SNR: -18.50 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": 38.559512, "longitude": -0.102059, "altitude": 39, "sats_in_view": null, "precision_bits": 32 }

Complete Protobuf Decode (JSON)

{ "service_envelope": { "gateway_id": "!849c5bbc", "channel_id": "LongFast", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 2053992852, "to": 4294967295, "id": 3275917012, "rx_time": 1751196072, "rx_snr": -18.5, "rx_rssi": -127, "hop_limit": 4, "hop_start": 6, "via_mqtt": 0, "want_ack": 0, "priority": 0, "delayed": 0, "channel_index": null, "pki_encrypted": 0, "next_hop": 0, "relay_node": 0, "tx_after": 0, "decoded": { "portnum": 3, "payload": "0df0b6fb1615526df0ff1827259821616828017800800100b80120", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "latitude_i": 385595120, "longitude_i": -1020590, "altitude": 39, "time": 1751196056, "location_source": "LOC_MANUAL", "ground_speed": 0, "ground_track": 0, "precision_bits": 32, "type": "protobuf", "portnum": "POSITION_APP", "message_class": "Position" } } } }

Raw Packet Data (27 bytes)

0df0b6fb1615526df0ff1827259821616828017800800100b80120

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 #2245684 Success

Packet Information

Payload Data

Decoded Data: