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• Add option to shift the base tx/rx frequency of the protocols
• Fix frequency range calculation

• Fix bandwidth calculation for mono-tone [MT] protocols
• Show error when trying to use [MT] protocol without "fixed-length" mode

• Fix DSS for fixed-length payloads
• Add mono-tone (MT) protocols suitable for communication with microcontrollers

[v0.4.0] - 2022-07-05

This release introduces some breaking changes in the C and C++ API!

Make sure to read the ggwave.h header for more information

• Major refactoring in order to support microcontrollers (#65)
• Zero memory allocations during runtime
• Do not include STL headers anymore
• New, low-frequency, mono-tone (MT) protocols suitable for microcontrollers
• Remove code-duplication for some of the examples
• Better FFT implementation
• Less memory usage
• Bug fix in fixed-length payload decoding
• Add Arduino and ESP32 examples
• Support for Direct Sequence Spread (DSS)

Added Direct-sequence spread (DSS) option

• Add interface for changing ggwave's internal logging (#52, #55)
• Fix out-of-bounds access in ggwave_decode (#53)
• Add C interface for selecting Rx protocols (#60)

• Resampling fixes
• Add soundMarkerThreshold parameter (f4fb02d)
• Sampling rates are now consistently represented as float instead of int
• Add option to query the generated tones (ba87a65)
• Fix python build on Windows (d73b184)

Minor update:

• Fix data race during app initialization on Android (59f576f1e8132bddc865524209dd37a7fa4e221c)

Click the image for a high-quality video:

Changelog:

• Fixed-length Tx/Rx support
• Spectrogram display
• Optimized Spectrum display
• New Dual-tone protocols
• Display protocol info - bandwidth and frequency range
• Improved decoding performance
• Option to select Rx Protocols
• Option for pitch shift
• Option to resend last message
• Option to cancel receiving

• Supported sampling rates: 6kHz - 96kHz
• Variable-length payloads
• Fixed-length payloads (no sound markers emitted)
• Reed-Solomon based ECC
• Ultrasound support