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Temperature and humidity sensor

MCCI Model 4931 LoRaWAN decoder and payload format

The MCCI Model 4931 is a LoRaWAN temperature and humidity sensor that reports temperature, humidity, pressure, rainfall and pulse count. It runs on a replaceable Li-ion cylindrical (ICR18650) battery and it works from -20 to 70 °C.

MCCI Model 4931
Official decoderDatasheetProduct 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 1

Payload (hex)

37 03 FD 3B 33 0A 19 00 99 99 62 ED 14 00 15 00 07 08 00 1E 00 01 3F 06 A4 00 19 00 01 1E 00 1E 00 06 CE 88 00 01 8A 98 00 54 9F 48 12 00

Decoded (JSON)

{
  "boot": 10,
  "p": 1013,
  "p_1": 31.25,
  "p_1_mV": 1.875,
  "p_2": 31.25,
  "p_2_mV": 1.875,
  "rainCount": 394,
  "rainPerHour": 112.5,
  "rh": 60,
  "sap_1_GallonsPerTap": 1742,
  "sap_1_GallonsPerTapPerHour": 56.25,
  "sdCardPresence": "SD card is present",
  "sdCardWorking": "SD card write success",
  "soil_1_TempC": 18,
  "soil_1_Type": 1,
  "soil_1_VMC": 0.3,
  "soil_2_TempC": 17,
  "soil_2_Type": 1,
  "soil_2_VMC": 0.25,
  "state": 0,
  "t": 25,
  "tDew": 16.69766352121289,
  "tHeatIndexC": null,
  "timeType": "boot time",
  "timestamp": "2025-01-01T00:00:01.000Z",
  "tProbeOne": 20,
  "tProbeTwo": 21,
  "vBat": 3.699951171875
}
FieldValue
boot10
p1013
p_131.25
p_1_mV1.875
p_231.25
p_2_mV1.875
rainCount394
rainPerHour112.5
rh60
sap_1_GallonsPerTap1742
sap_1_GallonsPerTapPerHour56.25
sdCardPresenceSD card is present
sdCardWorkingSD card write success
soil_1_TempC18
soil_1_Type1
soil_1_VMC0.3
soil_2_TempC17
soil_2_Type1
soil_2_VMC0.25
state0
t25
tDew16.69766352121289
tHeatIndexCnull
timeTypeboot time
timestamp2025-01-01T00:00:01.000Z
tProbeOne20
tProbeTwo21
vBat3.699951171875

Specifications

Manufacturer
MCCI
Model
Model 4931
Type
Temperature and humidity sensor
Measures
temperature, humidity, pressure, rainfall, pulse count
Battery
Li-ion cylindrical (ICR18650) (replaceable)
Operating temperature
-20 … 70 °C
LoRaWAN regions
EU863-870, US902-928, AU915-928, AS923, KR920-923, IN865-867

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 MCCI Model 4931 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.