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Sigfox (styled SIGFOX), is a French company that builds wireless networks to connect low-energy objects such as electricity meters, smartwatches, and washing machines, which need to be continuously on and emitting small amounts of data. Its technology is aimed at the Internet of Things (IoT). (From WikipediA)

SigFox is a narrowband (or ultra-narrowband) technology.
It uses a standard radio transmission method called binary phase-shift keying (BPSK), and it takes very narrow chunks of spectrum and changes the phase of the carrier radio wave to encode the data.
This allows the receiver to only listen in a tiny slice of spectrum which mitigates the effect of noise. (From: LinkLabs)

The coverage of SigFox is here.

Here there is a Sigfox Overview.

STM kit for SigFox

S2-LP – transceiver (TX/RX)
Band: 433, 868 and 915/920 MHz
Modulation: 2(G)FSK, 4(G)FSK, OOK, ASK and -140 dBm.
Consumption: 7 mA RX and 10 mA TX @ +10 dBm
Ready for: Sigfox, Wireless M-Bus, 6LowPAN and IEEE 802.15.4g networking connectivity, simplifying the design of IoT applications and enabling remote sensors to directly connect to the cloud without the need for a local gateway.

  • The evaboard is:
    • STEVAL-FKI868V1 – Sub-1GHz transceiver development kit based on S2-LP

      STM release a complete SW package that is:
      STSW-S2LP-SFX-DK is an evaluation SW package for SigFox networking with the S2-LP high performance, ultra-low power RF transceiver.
      It is designed to operate in the majority of radio configuration zones (RCZ) described by SigFox.
      The STSW-S2LP-SFX-DK SW package supports the STEVAL-FKI868V1 (868MHz) and STEVAL-FKI915V1 (915MHz) kit platforms available on corresponding web pages.
      It provides an S2-LP SigFox library with a complete set of APIs to develop embedded applications.
      The S2-LP – SigFox Demo GUI PC application provides an interactive interface to transmit messages to the SigFox network and program the ST STEVAL-FKI nodes with the SigFox ID to ready the node for network communication.Key Features* S2-LP – SigFox Demo GUI PC application with graphical user interface
      * ST-SigFox library API for S2-LP
      * Sample embedded application provided
      * SDK Eval NUCLEO-L1 low level API to manage the motherboard (NUCLEO-STM32L1) interfacing with the S2-LP daughterboard
      * STM32L1 HAL driver (STM32Cube)
      * Drivers for PC (USB Virtual COM + mass storage)
    •  The basic kit for test SigFox must be composed by:
      NUCLEO_64pins + STEVAL-FKI868V1
      We suggest to use the NUCLEO-L1152RE + STEVAL-FKI868V1