SigfoxTracker
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| Project SigfoxTracker | |
|---|---|
| |
| Investigating sigfox location trackers | |
| Status | Initializing |
| Contact | bertrik |
| Last Update | 2022-05-21 |
What
This page is about investigation of Sigfox location trackers, e.g.:
- how existing trackers work
- coverage of the sigfox network
- how to interact with the sigfox backend
- ultimately, help develop a sigfox tracker for tracking small animals, like bats
Investigation
- great page at disk91 about sigfox, part from reverse engineering
- coverage map https://www.sigfox.com/en/coverage
- modulation is D-BPSK, frequency range is 192 kHz is in the 868 MHz band
- a packet consists of max 26 bytes, of which 12 bytes are user payload
Interesting reading:
- https://www.disk91.com/2019/technology/sigfox/make-you-own-1-sigfox-iot-device/
- https://www.disk91.com/2019/news/sigfox-news/i-held-the-first-1-sigfox-iot-device/
- https://www.disk91.com/2018/technology/sigfox/create-a-5-autonomous-tracker-with-esp8266-and-sigfox/
How to get the keys:
coverage
Existing trackers
LWT-100
This is a tracker made by Invoxia, features:
- sends positions using sigfox, configured via bluetooth
- fcc id ZVS-LWT1: https://fccid.io/ZVS-LWT1/Internal-Photos/Internal-Photos-3734578
- ESP-8285 chip, this is a microcontroller similar to ESP-8266, used as a 'WiFi coprocessor'?
- NXP-QN9080, Ultra low power Bluetooth 5 system-on-chip solution, probably the 'main controller', see https://www.nxp.com/docs/en/nxp/data-sheets/QN908x.pdf
- U-blox M8030-CT, GNSS chip,see https://www.u-blox.com/en/product/ubx-m8030-series
- Semtech SX1272, LoRa chip
- LiPo battery, 352044 300 mAh 3.7V
- chip antenna for LoRa/Sigfox, 11x5.5mm
- chip antenna for wifi/bluetooth/gps, 10x3 mm
Apparently this was originally a LoRa tracker, contains a LoRa transceiver, but now uses SigFox! The radio waveform is created by the SX1272, not by a specialized Sigfox chip.
Software
The ST package 'STM32Cube_FW_WL_V1.0.0' has examples for Sigfox: https://www.st.com/en/embedded-software/stm32cubewl.html
In directory XX you can find the following examples:
- Sigfox_AT_Slave
- Sigfox_AT_Slave_DualCore
- Sigfox_PushButton
- Sigfox_PushButton_DualCore
It appears that, typically, you should edit a file sigfox_data.h to enter the sigfox credentials (device id, pac and key)
The Sigfox credentials can be retrieved from a STM32WL chip as follows:
- install STM32 cube programmer
- connect the STM32WL chip through a STLINK2
- select the sigfox logo in the left of the screen
- there is a button "copy chip certificate" and "open sigfox page" that sends you to https://my.st.com/sfxp
- on that page you can submit the chip certificate data and get a zip in return containing the dev id, pac and key