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.
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.
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 00Decoded (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
}
}| Field | Value |
|---|---|
| accelerationOnX | -24 mg |
| accelerationOnY | -38 mg |
| accelerationOnZ | -963 mg |
| altitude | 48.73 mslm |
| batteryVoltage | 4055 mV |
| humidity | 34 % |
| latitude | 37.4415 ° |
| ledStatus | OFF |
| longitude | 15.0596 ° |
| pressure | 1012 hPa |
| tamperInput | null null |
| temperature | 29 °C |
Add it to The Things Stack, ChirpStack, Actility ThingPark or LORIOT with its DevEUI, JoinEUI and AppKey and the frequency plan of your region.
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.
Set up the integration once per network server; every device registered there then reaches Cloud Studio IoT with its decoded values.
The decoded fields become device variables for dashboards, alarms by email or SMS, and scheduled reports.
Device facts and decoder examples: The Things Network Device Repository (Apache-2.0) · commit a49b17a, imported 2026-09-18.