This program is able to encode and decode ITU G.9959 frames (implemented, e.g. by the z-wave home automation protocol) using a RTL-SDR dongle or an HackRF One (or any other radio handling raw IQ files).

 mkdir build
 cd build
 cmake .. -DCMAKE_BUILD_TYPE=Release
 cmake --build .

A cheap RTL SDR radio and/or an HackRF One wit the related software rtl-sdr and/or hackrf packages.

The tools use the standard input and output to retrieve and generate the data.

Read the docs with:

 $ ./wave-in --help

Receive and decode z-wave packages using rtl_srd and wave-in.

 $ rtl_sdr -f 868420000 -s 2000000 -g 25  - | ./wave-in -u

Read the docs with:

 $ ./wave-out --help

Encode and transmit z-wave packages using wave-out and hackrf_transfer.

 $ #              HomeId      SourceID FrameCtl LEN DestID CommandClass Command
 $ #              +---------+            +----+                           +---+
 $ ./wave-out -p 'd6 b2 62 08       01   41  03  0d     07           25   01 ff' > turn_on_device_7.cs8
 $ #              HomeId      SourceID FrameCtl LEN DestID CommandClass Command
 $ #              +---------+            +----+                           +---+
 $ ./wave-out -p 'd6 b2 62 08       01   41  03  0d     07           25   01 00' > turn_off_device_7.cs8
 $ hackrf_transfer -f 868420000 -s 2000000 -t turn_off_device_7.cs8

The modulator is a simple FSK modulator. The modulator is phase continuous using a simple trick (the sampling rate, baud rate, and separation are in phase).

The demodulator is based on https://github.com/andersesbensen/rtl-zwave and consists of an atan demodulator and 2 nested state machines, the first one (sample_sm) converts the samples into symbols and the second one (symbol_sm) the bits into frame information and payload.