Packet #12220424

Database ID:	12220424
Mesh Packet ID:	`0x70d86d1f` Used for correlation across gateways
Timestamp:	2025-09-26 08:42:22 UTC
From Node:	Meshtastic e38b (e38b)
To Node:	!ffffffff (ffff)
Success:	Processed
Protocol:	NODEINFO_APP Port: 4

Gateway:	Meshtastic 9b88 (9b88)
Channel:	MediumSlow
RSSI:	-50 dBm
SNR:	8.5 dBm
Hop Info:	0/4 hops Start: 4, Limit: 4

Long Name:	Meshtastic e38b
Short Name:	e38b
Node ID:	!87cfe38b
MAC Address:	xumHz+OL
Hardware:	TRACKER_T1000_E

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:	80 bytes
Gateway:	!9e9b9b88
Channel:	MediumSlow
Payload Type:	NODEINFO_APP
Hop Count:	Unknown / 4

Privacy Summary

Exposure Level:
Broadcast

Privacy Features:
✓ Direct LoRa transmission (not via MQTT)
✓ Custom channel: MediumSlow
+ 2 more...

Exposure Risks:
⚠ Visible to all nodes on channel
⚠ Packet visible to MQTT subscribers
+ 1 more...

MQTT ServiceEnvelope Fields

MQTT ServiceEnvelope contains the MeshPacket plus routing metadata

Field	Value
`gateway_id`	`!9e9b9b88` Node ID format
`channel_id`	`MediumSlow`
`packet`	`MeshPacket` (80 bytes) Contains the actual mesh network packet

MeshPacket Fields

Core mesh packet with routing and payload information

Field	Value	Type
`from`	`2278548363` Source node ID	uint32
`to`	`4294967295` (Broadcast) Visible to all nodes	uint32
`decoded.portnum`	`4` NODEINFO_APP	enum
`decoded.payload_length`	`80` 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`	`-50.0` dBm Signal strength at gateway	int32
`rx_snr`	`8.50` dB Signal quality at gateway	float
`rx_time`	`1758876140` 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`	`139` Relay node ID	uint32
`tx_after`	Not set	uint32
`timestamp`	`1758876142.5368102` 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)
✓ Custom channel: MediumSlow
✓ Gateway node ID tracked
✓ Zero-hop: direct from source to MQTT gateway

Exposure Risks:

⚠ Visible to all nodes on channel
⚠ Packet visible to MQTT subscribers
⚠ RF signal metrics exposed (location inference possible)

MQTT-Specific Fields

Gateway ID:	`!9e9b9b88`
Zero Hop Policy:	Enabled Direct gateway connection
Signal Metrics:	RSSI: -50.0 dBm SNR: 8.50 dB

Complete Payload Analysis

Detailed breakdown of all payload fields and decoded data

Payload Metadata:

Protocol:	NODEINFO_APP
Size:	80 bytes
Decoded:	Yes

Complete Payload Data (JSON):

{ "id": "!87cfe38b", "long_name": "Meshtastic e38b", "short_name": "e38b", "macaddr": "xumHz+OL", "hw_model": "TRACKER_T1000_E" }

Complete Protobuf Decode (JSON)

{ "service_envelope": { "gateway_id": "!9e9b9b88", "channel_id": "MediumSlow", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 2278548363, "to": 4294967295, "id": 1893231903, "rx_time": 1758876140, "rx_snr": 8.5, "rx_rssi": -50, "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": 139, "tx_after": 0, "decoded": { "portnum": 4, "payload": "0a09213837636665333862120f4d65736874617374696320653338621a04653338622206c6e987cfe38b28474220bb21a7b9eb88e6e38a25fca26522a54093577c0328ff95040336e47e6fd89c5d4800", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "id": "!87cfe38b", "long_name": "Meshtastic e38b", "short_name": "e38b", "macaddr": "xumHz+OL", "hw_model": "TRACKER_T1000_E", "public_key": "uyGnueuI5uOKJfyiZSKlQJNXfAMo/5UEAzbkfm/YnF0=", "is_unmessagable": false, "type": "protobuf", "portnum": "NODEINFO_APP", "message_class": "User" } } } }

Raw Packet Data (80 bytes)

0a09213837636665333862120f4d65736874617374696320653338621a04653338622206c6e987cfe38b28474220bb21a7b9eb88e6e38a25fca26522a54093577c0328ff95040336e47e6fd89c5d4800

Hex Analysis:

Size:	80 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 #12220424 Success

Packet Information

Payload Data

Decoded Data: