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Water leak sensor

ELV LW-SWD LoRaWAN decoder and payload format

The ELV LW-SWD is a LoRaWAN water leak sensor that reports moisture detection, water leaks and acceleration. It runs on a replaceable LR03 battery and it works from -20 to 50 °C.

ELV LW-SWD
Official decoderProduct page

Payload format

An uplink from the device as it arrives at the network server, and what the official decoder returns for it. Examples come from the decoder's own test cases.

Example 1 · fPort 10

Payload (hex)

6C 01 02 00 01 00 00

Decoded (JSON)

{
  "Activation_count": 0,
  "Dryness": true,
  "Error_Msg": 0,
  "Frame_Type": "Device_State",
  "Moisture": false,
  "Supply_Voltage": 2.88,
  "TX_Reason": "Cyclic Timer",
  "Tilt_Angle": 0,
  "Water": false
}
FieldValue
Activation_count0
Drynesstrue
Error_Msg0
Frame_TypeDevice_State
Moisturefalse
Supply_Voltage2.88
TX_ReasonCyclic Timer
Tilt_Angle0
Waterfalse

Example 2 · fPort 10

Payload (hex)

6C 02 07 00 02 00 00

Decoded (JSON)

{
  "Dry": false,
  "Error_Msg": 0,
  "Frame_Type": "Sensor_Data",
  "Moisture": true,
  "Supply_Voltage": 2.88,
  "TX_Reason": "Moisture",
  "Tilt_Angle": 0,
  "Water": false
}
FieldValue
Dryfalse
Error_Msg0
Frame_TypeSensor_Data
Moisturetrue
Supply_Voltage2.88
TX_ReasonMoisture
Tilt_Angle0
Waterfalse

Specifications

Manufacturer
ELV
Model
LW-SWD
Type
Water leak sensor
Measures
moisture detection, water leaks, acceleration
Battery
LR03 (replaceable)
Operating temperature
-20 … 50 °C
LoRaWAN regions
EU863-870

Connect it to Cloud Studio IoT

  1. 1

    Register the device in your network server

    Add it to The Things Stack, ChirpStack, Actility ThingPark or LORIOT with its DevEUI, JoinEUI and AppKey and the frequency plan of your region.

  2. 2

    Apply the decoder

    In The Things Stack, pick the model from the device repository and its decoder is applied for you. In ChirpStack v4, paste the official decoder as the device profile's JavaScript codec.

  3. 3

    Connect the network server to Cloud Studio IoT

    Set up the integration once per network server; every device registered there then reaches Cloud Studio IoT with its decoded values.

  4. 4

    Build dashboards and alarms

    The decoded fields become device variables for dashboards, alarms by email or SMS, and scheduled reports.

See your ELV LW-SWD on a dashboard

Start a free trial, add the device with its DevEUI and get dashboards and alarms from its next uplink.

Talk to us

Frequently asked questions

Device facts and decoder examples: The Things Network Device Repository (Apache-2.0) · commit 7693223, imported 2026-10-05.