Packet #2667500 Success

POSITION_APP packet from Nicomachus (ncmc) to !ffffffff

13
Total Receptions
13
Unique Gateways
0
Hop Count
22
Payload Bytes
Packet Information
Database ID: 2667500
Mesh Packet ID: 0x2b969dbf
Used for correlation across gateways
Timestamp: 2025-11-23 21:43:37 UTC
From Node: Nicomachus (ncmc)
To Node: !ffffffff (ffff)
Success: Processed
Protocol: POSITION_APP
Port: 3
Gateway: Nicomachus 🏃 (ncmp)
Channel: LongFast
RSSI: -18 dBm
SNR: 10.25 dBm
Hop Info: 0/4 hops
Start: 4, Limit: 4
Relay Node: 80 ncmc
Last byte of the last hop that relayed this packet - Candidate source node(s) based on 0-hop direct receptions
Payload Data
Protocol: POSITION_APP
Size: 22 bytes
Decoded: Yes
Decoded Data:
Latitude:40.658534°
Longitude:-74.003251°
Altitude:21 m
Precision:13 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:22 bytes
Gateway:!c9553a20
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

FieldValue
gateway_id !c9553a20
Node ID format
channel_id LongFast
Default public channel
packet MeshPacket (22 bytes)
Contains the actual mesh network packet
MeshPacket Fields

Core mesh packet with routing and payload information

FieldValueType
from 2658555520
Source node ID 		uint32
to 4294967295 (Broadcast)
Visible to all nodes 		uint32
decoded.portnum 3
POSITION_APP 		enum
decoded.payload_length 22 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 -18.0 dBm
Signal strength at gateway 		int32
rx_snr 10.25 dB
Signal quality at gateway 		float
rx_time 1763934318
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 128
Relay node ID 		uint32
tx_after Not set uint32
timestamp 1763934217.2117772
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: ~2900.0m 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: !c9553a20
Position Precision: 13 bits (~2900.0m accuracy)
Position precision meters: 2900.0
Zero Hop Policy: Enabled
Direct gateway connection
Signal Metrics: RSSI: -18.0 dBm
SNR: 10.25 dB
Complete Payload Analysis

Detailed breakdown of all payload fields and decoded data

Payload Metadata:
Protocol:POSITION_APP
Size:22 bytes
Decoded: Yes
Complete Payload Data (JSON):
{ "latitude": 40.6585344, "longitude": -74.0032512, "altitude": 21, "sats_in_view": null, "precision_bits": 13 }
Complete Protobuf Decode (JSON)
{ "service_envelope": { "gateway_id": "!c9553a20", "channel_id": "LongFast", "packet": "MeshPacket (see mesh_packet below)" }, "mesh_packet": { "from": 2658555520, "to": 4294967295, "id": 731291071, "rx_time": 1763934318, "rx_snr": 10.25, "rx_rssi": -18, "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": 128, "tx_after": 0, "decoded": { "portnum": 3, "payload": "0d00003c18150000e4d3181528037800800100b8010d", "want_response": null, "dest": null, "source": null, "request_id": null, "reply_id": null, "emoji": null, "parsed_payload": { "latitude_i": 406585344, "longitude_i": -740032512, "altitude": 21, "location_source": "LOC_EXTERNAL", "ground_speed": 0, "ground_track": 0, "precision_bits": 13, "type": "protobuf", "portnum": "POSITION_APP", "message_class": "Position" } } } }
Raw Packet Data (22 bytes)
0d00003c18150000e4d3181528037800800100b8010d
Hex Analysis:
Size:22 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.
All Receptions
All gateways that received this packet
Correlation: Using Mesh Packet ID
Reception Locations

Loading reception map...

Map shows gateway locations that received this packet. Hop counts are displayed if available.
Gateway Time Offset RSSI SNR Hops Relay Channel Timestamp Actions
Nicomachus 🏃 (ncmp) Primary 0.000s
Reference 		-18.0 dBm 10.25 dB 0 80 ncmc LongFast 2025-11-23 21:43:37 UTC Current
K2XAP V4 MS (XAP4) +6.359s
After 		-83.0 dBm -11.25 dB 1 - LongFast 2025-11-23 21:43:43 UTC View
ClaremontWx.net (CmWx) +6.379s
After 		-90.0 dBm -2.25 dB 1 - LongFast 2025-11-23 21:43:43 UTC View
Gowanus Soda (p1p) +6.651s
After 		-109.0 dBm -6.25 dB 1 - LongFast 2025-11-23 21:43:43 UTC View
Meshtastic 631c (631c) +6.719s
After 		-106.0 dBm -14.00 dB 1 - LongFast 2025-11-23 21:43:43 UTC View
K2XAP / nyme.sh (XAP) +8.021s
After 		-80.0 dBm -10.25 dB 2 78 SCP2 LongFast 2025-11-23 21:43:45 UTC View
Poncho@PTSD | MediumSlow (pppp) +9.253s
After 		-85.0 dBm -0.50 dB 2 57 CmWx LongFast 2025-11-23 21:43:46 UTC View
Sunset Soda (p8p) +9.288s
After 		-128.0 dBm -18.75 dB 2 57 CmWx LongFast 2025-11-23 21:43:46 UTC View
Steiner Studios Tower (SST) +10.110s
After 		-117.0 dBm -9.50 dB 3 c9 Penn , JLX3 LongFast 2025-11-23 21:43:47 UTC View
DRP1 Chelsea (DRP1) +10.477s
After 		-78.0 dBm 5.50 dB 3 c9 Penn , JLX3 LongFast 2025-11-23 21:43:47 UTC View
Fried Fish 1 | nyme.sh (FF1) +11.896s
After 		-103.0 dBm -15.00 dB 4 - LongFast 2025-11-23 21:43:49 UTC View
YMH 2 @ Your Mom’s House (YMH2) +12.574s
After 		-69.0 dBm -4.00 dB 4 90 NLG1 LongFast 2025-11-23 21:43:49 UTC View
@_tedks02 (tks2) +16.841s
After 		-76.0 dBm 4.25 dB 4 9b KOS0 LongFast 2025-11-23 21:43:54 UTC View
13

Total Receptions

13

Unique Gateways