Packet #3950705

Database ID:	3950705
Mesh Packet ID:	`0xa120e5af` Used for correlation across gateways
Timestamp:	2025-07-17 07:47:09 UTC
From Node:	SabXiaostic1 (sabx)
To Node:	Karman’s Tube Solar 1️⃣🗼 (KTS1)
Success:	Processed
Protocol:	NODEINFO_APP Port: 4

Gateway:	Santastic 3234 (S3)
Channel:	LongFast
RSSI:	-56 dBm
SNR:	6.5 dBm
Hop Info:	0/5 hops Start: 5, Limit: 5

Long Name:	SabXiaostic1
Short Name:	sabx
Node ID:	!6996f7c0
MAC Address:	5v1plvfA
Hardware:	XIAO_NRF52_KIT

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:	77 bytes
Gateway:	!849c3234
Channel:	LongFast
Payload Type:	NODEINFO_APP
Hop Count:	Unknown / 5

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
+ 1 more...

MQTT ServiceEnvelope Fields

MQTT ServiceEnvelope contains the MeshPacket plus routing metadata

Field	Value
`gateway_id`	`!849c3234` Node ID format
`channel_id`	`LongFast` Default public channel
`packet`	`MeshPacket` (77 bytes) Contains the actual mesh network packet

MeshPacket Fields

Core mesh packet with routing and payload information

Field	Value	Type
`from`	`1771501504` Source node ID	uint32
`to`	`211245879` Target node ID	uint32
`decoded.portnum`	`4` NODEINFO_APP	enum
`decoded.payload_length`	`77` bytes	size
`hop_limit`	`5` Remaining hops allowed	uint32
`hop_start`	`5` Initial hop limit	uint32
`hops_taken`	`0` Calculated: hop_start - hop_limit	derived
`rx_rssi`	`-56.0` dBm Signal strength at gateway	int32
`rx_snr`	`6.50` dB Signal quality at gateway	float
`rx_time`	`1752738427` 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`	`192` Relay node ID	uint32
`tx_after`	Not set	uint32
`timestamp`	`1752738429.4281406` 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
⚠ RF signal metrics exposed (location inference possible)

MQTT-Specific Fields

Gateway ID:	`!849c3234`
Zero Hop Policy:	Enabled Direct gateway connection
Signal Metrics:	RSSI: -56.0 dBm SNR: 6.50 dB

Complete Payload Analysis

Detailed breakdown of all payload fields and decoded data

Payload Metadata:

Protocol:	NODEINFO_APP
Size:	77 bytes
Decoded:	Yes

Complete Payload Data (JSON):

{ "id": "!6996f7c0", "long_name": "SabXiaostic1", "short_name": "sabx", "macaddr": "5v1plvfA", "hw_model": "XIAO_NRF52_KIT" }

Complete Protobuf Decode (JSON)

{ "service_envelope": { "gateway_id": "!849c3234", "channel_id": "LongFast", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 1771501504, "to": 211245879, "id": 2703287727, "rx_time": 1752738427, "rx_snr": 6.5, "rx_rssi": -56, "hop_limit": 5, "hop_start": 5, "via_mqtt": 0, "want_ack": 0, "priority": 0, "delayed": 0, "channel_index": null, "pki_encrypted": 0, "next_hop": 0, "relay_node": 192, "tx_after": 0, "decoded": { "portnum": 4, "payload": "0a09213639393666376330120c5361625869616f73746963311a04736162782206e6fd6996f7c028584220caa6e55b03d0c51ca46c1de259a03cbe5edceb2833c77928068cc08fcf4b29564801", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "id": "!6996f7c0", "long_name": "SabXiaostic1", "short_name": "sabx", "macaddr": "5v1plvfA", "hw_model": "XIAO_NRF52_KIT", "public_key": "yqblWwPQxRykbB3iWaA8vl7c6ygzx3koBozAj89LKVY=", "type": "protobuf", "portnum": "NODEINFO_APP", "message_class": "User" } } } }

Raw Packet Data (77 bytes)

0a09213639393666376330120c5361625869616f73746963311a04736162782206e6fd6996f7c028584220caa6e55b03d0c51ca46c1de259a03cbe5edceb2833c77928068cc08fcf4b29564801

Hex Analysis:

Size:	77 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 #3950705 Success

Packet Information

Payload Data

Decoded Data: