AN-308 LoRaWAN Illuminance Sensor User Guide

Device Information: Model AN-308, devEui ffffff100004c8be, gateway IP 192.168.31.205, Modbus Slave ID 13, BACnet Device ID 113

1 Protocol Overview

The AN-308 reports illuminance, battery voltage, tamper status, and signal quality on Fport 210.

1.1 Uplink Data Protocol (Fport 210)

Payload format (Fport 210):

Byte	Field	Description
0	Reserved	Always `0x00` (protocol version)
1 … N	TLV pairs	`[Type(1 B)][Value(N B)]` … repeating until end

Each Type byte determines the field name and the number of following value bytes:

Type	Value Bytes	Field Name	Encoding	Scale	Unit	Notes
`0x01`	1	`model`	uint8	—	—	Model code = 0x45
`0x04`	2	`batteryVoltage`	uint16 BE	÷1000	V	mV raw ÷1000 = V
`0x7D`	1	`batteryVoltageState`	uint8	—	—	0=normal 1=low voltage
`0x77`	1	`tamperState`	uint8	—	—	0=normal 1=tampered
`0x48`	4	`illuminance`	uint32 BE	—	Lux	e.g. 0x000003E8=1000 → 1000 Lux
`0x05`	1	`batteryLowEvent`	uint8	—	—	0=normal 1=low-voltage event
`0x03`	1	`tamperEvent`	uint8	—	—	0=normal 1=tamper event

JavaScript Decoder Example:

// AN-308 Illuminance Sensor — Fport 210 uplink decoder
function decodeUplink(bytes) {
  var i = 1, r = {};
  function u16(b,o){ return (b[o]<<8)|b[o+1]; }
  function u32(b,o){ return ((b[o]<<24)|(b[o+1]<<16)|(b[o+2]<<8)|b[o+3])>>>0; }
  while (i < bytes.length) {
    var t = bytes[i++];
    switch (t) {
      case 0x01: r.model               = bytes[i++]; break;
      case 0x03: r.tamperEvent         = bytes[i++]; break;
      case 0x04: r.batteryVoltage      = u16(bytes,i)/1000; i+=2; break;
      case 0x05: r.batteryLowEvent     = bytes[i++]; break;
      case 0x48: r.illuminance         = u32(bytes,i); i+=4; break; // Lux
      case 0x77: r.tamperState         = bytes[i++]; break;
      case 0x7D: r.batteryVoltageState = bytes[i++]; break;
      default:   i++; break;
    }
  }
  return r;
}
// Example payload (hex): 00 01 45 04 0D AC 7D 00 77 00 48 00 00 03 E8
// → { model:69, batteryVoltage:3.50, batteryVoltageState:0, tamperState:0, illuminance:1000 }

Script download: LPP.zip

Compatibility note: LPP.js is developed and tested against ChirpStack v4.17.0. The ChirpStack JavaScript codec API may differ across versions — if you are running a different ChirpStack version, review and adjust the script as needed before deployment.

2 Getting Uplink Data

⚠️ The IP addresses (192.168.31.205 / 192.168.31.193), ChirpStack API token, Slave ID, BACnet Device ID, and devEui in the examples below are for demonstration only. Replace them with your actual gateway IP, ChirpStack API token, and device parameters.

2.1 ChirpStack MQTT Subscription

Subscribe to the MQTT topic to receive real-time uplink frames:

Application ID — 3ef9e6b9-ec54-4eda-86b8-a5fb46899f39 is the factory-default ChirpStack
application built into the gateway. Replace it with your actual application
ID if you have created a different one.

Gateway IP — 192.168.31.205 is the gateway WAN port IP shown as an
example. Replace it with your actual gateway IP address.

Device EUI — ffffff100004c8be is the EUI of the example device.
Replace it with the EUI shown in the gateway device list, or use +
as a wildcard to subscribe to all devices at once.

# Subscribe to one specific device
mosquitto_sub -h 192.168.31.205 -p 1883 \
  -u gateway -P mqtt88888888 \
  -t "application/3ef9e6b9-ec54-4eda-86b8-a5fb46899f39/device/ffffff100004c8be/event/up"

# Subscribe to ALL devices on ALL applications (wildcard)
mosquitto_sub -h 192.168.31.205 -p 1883 \
  -u gateway -P mqtt88888888 \
  -t "application/+/device/+/event/up"

Example uplink payload (JSON):

{
  "devEui": "ffffff100004c8be",
  "fPort": 210,
  "object": {
    ...  (decoded LPP fields)
  }
}

2.2 IoT Hub HTTP API

Send a GET request to retrieve the latest device state:

curl -s "http://192.168.31.205:8070/api/getStatus?devEui=ffffff100004c8be"
{
  "success": true,
  "result": {
    "batteryVoltage": 3.65,
    "batteryVoltageState": 0,
    "tamper": 0,
    "illuminance": 67,
    "batteryLowEvent": false,
    "model": "AN-308"
  }
}

2.3 IoT Hub Modbus TCP — Python Script

Script download: modbus_tcp_read.py

Use modbus_tcp_read.py to poll all registers at once:

python3 modbus_tcp_read.py --ip 192.168.31.205 --port 502 \
    --slaveId 13 --sensorType AN-308
Target: 192.168.31.205:502 | Slave ID: 13 | Sensor: AN-308
================================================================================================================================================================
Attribute                | Addr   | FC  | Format     | Order        | Cnt | Scale    | Raw(Hex)            | Value              | Unit
----------------------------------------------------------------------------------------------------------------------------------------------------------------
online                   | 6      | 03  | Bit/Bool   | Big(ABCD)    | 1   | x1       | 0001                | true               | none
lastOnlineTime           | 7      | 03  | UnixTime   | Big(ABCD)    | 2   | x1       | 69CC CE49           | 1775029833         | second
batteryVoltage           | 9      | 03  | Int16(S)   | Big(ABCD)    | 1   | /100     | 016D                | 3.65               | volt
batteryVoltageState      | 10     | 03  | Int16      | Big(ABCD)    | 1   | x1       | 0000                | 0.0                | none
tamper                   | 11     | 03  | Int16      | Big(ABCD)    | 1   | x1       | 0000                | 0.0                | none
illuminance              | 12     | 03  | Int32      | Big(ABCD)    | 2   | x1       | 0000 0043           | 67.0               | lux
batteryLowEvent          | 14     | 03  | Bit/Bool   | Big(ABCD)    | 1   | x1       | 0000                | false              | none
tamperEvent              | 15     | 03  | Int16      | Big(ABCD)    | 1   | x1       | 0000                | 0.0                | none
model                    | 40     | 03  | String(24B) | ASCII        | 12  | x1       | 414E 2D33 3038 0000 ... | AN-308             | none
rssi                     | 52     | 03  | Int16      | Big(ABCD)    | 1   | x1       | FFCA                | -54.0              | none
snr                      | 53     | 03  | Int16      | Big(ABCD)    | 1   | x1       | 000E                | 14.0               | none

2.4 IoT Hub Modbus TCP — Modbus Poll

Tool download: Modbus Poll 9.5.0.1507.zip

Open Modbus Poll, connect to 192.168.31.205:502, Slave ID 13
Menu Setup → Read/Write Definition, set Function Code = FC03, Start Address = 6, Length = 48
Click OK — values update in real-time

2.5 IoT Hub BACnet BIP — Python Script

Script download: bacnet_read.py

Use bacnet_read.py to read all BACnet objects:

python3 bacnet_read.py --ip 192.168.31.205 --port 47808 --id 113
Target: 192.168.31.205:47808 | BACnet ID: 113 | Scan: 11300-11399
------------------------------------------------------------
Type | Instance | Offset | Value                    | Object Name
------------------------------------------------------------
BI   | 11302    | 2      | active                   | ffffff100004c8be.online
AI   | 11303    | 3      | 1775029888.00            | ffffff100004c8be.lastOnlineTime
AI   | 11304    | 4      | 3.65                     | ffffff100004c8be.batteryVoltage
AI   | 11305    | 5      | 0.00                     | ffffff100004c8be.batteryVoltageState
AI   | 11306    | 6      | 0.00                     | ffffff100004c8be.tamper
AI   | 11307    | 7      | 67.00                    | ffffff100004c8be.illuminance
BI   | 11308    | 8      | inactive                 | ffffff100004c8be.batteryLowEvent
AI   | 11309    | 9      | 0.00                     | ffffff100004c8be.tamperEvent
CV   | 11313    | 13     | AN-308                   | ffffff100004c8be.model
AI   | 11314    | 14     | -54.00                   | ffffff100004c8be.rssi
AI   | 11315    | 15     | 14.00                    | ffffff100004c8be.snr

2.6 IoT Hub BACnet BIP — YABE

Tool download: SetupYabe_v2.1.0.exe

Open YABE, connect to 192.168.31.205:47808
Expand Device 113 in the device tree
Browse AI/BI/AV/BV/CV objects to view real-time values