NEWS

Major improvements to the DSP and decoding engine - gives much better decoding success rate, especially for weak transmissions from distant aircraft.
Each VDL2 channel is now processed in a separate thread, which allows balancing the load onto multiple CPU cores.
Fixed a nasty decoder bug which caused good frames to be corrupted during decoding stage and therefore missed.
Added CRC checking for ACARS messages. If there is a CRC mismatch, the message will still be logged, but with an appropriate warning.
New StatsD metric avlc.msg.air2air - counts messages from aircraft to aircraft (however strange it seems, such things happen in real life).
New StatsD metric decoder.errors.too_long - counts VDL2 bursts dropped due to unreasonably large value in the length field.
Due to changes in the decoding engine, the following StatsD metric are now obsolete and have been removed: avlc.errors.no_flag_start, avlc.errors.no_flag_end, decoder.errors.no_preamble.
Added --extended-header command line option which causes a few decoder diagnostic parameters to be logged for each message. Refer to the FAQ in README.md for description of the fields.
Other minor bugfixes and improvements.
C11-capable compiler is now required to build the program.

Added decpdlc utility which decodes FANS-1/A CPDLC messages supplied from command line or from a file. Can be used to decode CPDLC traffic received via other media than VDL-2 (eg. ACARS, HFDL, SATCOM). Refer to "decpdlc" section in README.md for details.

Added decoder for FANS-1/A ADS-C messages
Added decoder for FANS-1/A CPDLC messages
Human-readable formatting of CPDLC and Context Management messages (if you still want the old format, add --dump-asn1 command line option)
Added install rule to Makefile
Added a sample systemd service file
Bug fixes

Better input signal filtering - reduced bit error rate, 10-50% more messages successfully decoded.
SDRPlay: major bugfixes in sample buffer handling code - shall now perform equally well as RTLSDR (or even better).
SDRPlay: --gain knob replaced with --gr (gain reduction). This makes gain configuration in dumpvdl2 compatible with other SDRPlay apps. See README.md for details.
SDRPlay: support for selecting device by serial number.
Added optional build-time PLATFORM knob which sets CPU-specific compiler flags to optimize the code for various flavours of Raspberry Pi. Supported values: rpiv1, rpiv2, rpiv3.
Other minor bug fixes

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