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GPS tracker

STMicroelectronics STEVAL-ASTRA1B LoRaWAN decoder and payload format

The STMicroelectronics STEVAL-ASTRA1B is a LoRaWAN GPS tracker that reports acceleration, rotation (gyroscope), pressure, temperature and GPS position. It runs on a replaceable 480 mAh LiPo battery.

STMicroelectronics STEVAL-ASTRA1B
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 99

Payload (hex)

00 73 27 88 01 67 01 22 02 68 44 03 71 FF E8 FF DA FC 3D 04 88 05 B6 8F 02 4C 44 00 13 09 05 02 0F D7 06 01 00 07 00 00

Decoded (JSON)

{
  "accelerationOnX": {
    "displayName": "Acceleration on X axis",
    "unit": "mg",
    "value": -24
  },
  "accelerationOnY": {
    "displayName": "Acceleration on Y axis",
    "unit": "mg",
    "value": -38
  },
  "accelerationOnZ": {
    "displayName": "Acceleration on Z axis",
    "unit": "mg",
    "value": -963
  },
  "altitude": {
    "displayName": "Altitude",
    "unit": "mslm",
    "value": 48.73
  },
  "batteryVoltage": {
    "displayName": "Battery voltage",
    "unit": "mV",
    "value": 4055
  },
  "humidity": {
    "displayName": "Humidity",
    "unit": "%",
    "value": 34
  },
  "latitude": {
    "displayName": "Latitude",
    "unit": "°",
    "value": 37.4415
  },
  "ledStatus": {
    "displayName": "Led status",
    "value": "OFF"
  },
  "longitude": {
    "displayName": "Longitude",
    "unit": "°",
    "value": 15.0596
  },
  "pressure": {
    "displayName": "Barometric pressure",
    "unit": "hPa",
    "value": 1012
  },
  "tamperInput": {
    "displayName": "Tamper input",
    "unit": "null",
    "value": "null"
  },
  "temperature": {
    "displayName": "Temperature",
    "unit": "°C",
    "value": 29
  }
}
FieldValue
accelerationOnX-24 mg
accelerationOnY-38 mg
accelerationOnZ-963 mg
altitude48.73 mslm
batteryVoltage4055 mV
humidity34 %
latitude37.4415 °
ledStatusOFF
longitude15.0596 °
pressure1012 hPa
tamperInputnull null
temperature29 °C

Specifications

Manufacturer
STMicroelectronics
Model
STEVAL-ASTRA1B
Type
GPS tracker
Measures
acceleration, rotation (gyroscope), pressure, temperature, GPS position
Battery
480 mAh LiPo battery (replaceable)
LoRaWAN regions
EU863-870, US902-928, AU915-928, AS923, CN779-787, KR920-923, IN865-867, RU864-870

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 STMicroelectronics STEVAL-ASTRA1B 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.