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- Update to version 2.3.0
  * Allow reading raw frames or I/Q data from standard input. To
    enable this, specify "-" as the argument to --iq-file or
    --raw-frames-file option, respectively.
  * Added --prettify-json command line option which enables
    prettification of JSON payloads in libacars >= 2.2.0.
    This currently applies to OHMA messages only.
  * Fixed incompatibility with libacars 2.2.0 which might cause a
    crash during reassembly of CLNP packets.

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- Update to version 2.2.0
  * Added support for reassembly of multipart CLNP and COTP packets.
    This brings the ability to decode ADS-C v2 messages which are
    too large to fit in a single CLNP / COTP packet, even if
    fragmented in the X.25 layer.
  * Added proper formatting of Route Clearance CPDLC message
    elements.  Removed the obsolete 8-channel limit. The maximum
    number of VDL2 channels that can be decoded simultaneously is
    now limited only by the hardware.
  * Station ID (specified with --station-id option) is now
    appended to the StatsD namespace if StatsD metric collection
    is enabled. For example, if the station ID is set to KLAX, the
    new namespace would be "dumpvdl2.KLAX" instead of just
    "dumpvdl2". This allows simultaneous monitoring of several
    dumpvdl2 instances separately in Grafana.
  * Fixed a crash which occurred when the ground station list
    file could not be opened.

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- Update to version 2.1.1
  * Fixed wrong ZeroMQ version check, which incorrectly declared
    ZMQ version 4.0.x as too old.

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- Update to version 2.1.0
  * Added full JSON formatting for all protocols and message types.
    This is supported on all output types - file, udp and zmq.
    Together with multiple outputs feature that was introduced in
    version 2.0.0 this enables arbitrarily flexible arrangements,
    like logging to a file as text, logging to another file as JSON
    and sending JSON across the network using UDP and/or ZMQ. When
    collecting data from multiple receivers, --station-id option
    may be used to assign unique names to receivers in order to
    discriminate input from each one.
  * Removed a few duplicate routines that have their counterparts
    in libacars.

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- Update to versino 2.0.1
  * Fixed build failure with gcc version 10.

- Update to version 2.0.0
  * Major overhaul of the output subsystem. The new architecture
    is modular, multithreaded and can easily be extended with new
    output drivers. It also allows using multiple outputs
    simultaneously.
  * New output configuration scheme. --output-file --daily,
    --hourly and --output-acars-pp options have been removed.
    All outputs are now configured using --output option.
    Adjusting command line parameters is therefore required to run
    the program. Run dumpvdl2 --output help for instructions or
    see "Output configuration" section in README.md for details
    and examples.
  * Support for streaming messages over network using UDP/IP.
  * Support for streaming messages over network using ZeroMQ
    publisher sockets. Requires libzmq library.
  * Support for storing AVLC frames as raw data (without decoding)
    in binary files for archiving purposes. File contents can
    then be decoded anytime later, as if the frames were just
  * received from the air. Requires protobuf-c library.
  * Minor bugfixes.

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- Update to version 1.10.1
  * Added support for SDRPlay API version 3 which is required for
    new devices (notably RSPdx). API version 2 is still supported,
    however it will probably be removed in a future release. It is
    possible to have both versions installed simultaneously and to
    choose which one to use at runtime. See README.md for details.
  * Added --milliseconds option which enables printing timestamps
    in message headers up to a millisecond precision. Note that the
    arrival timestamp is stored per VDL2 burst, not per VDL2
    message. Since a VDL2 burst may contains more than one VDL2
    message, all messages extracted from a single burst will still
    have exactly the same timestamp value, regardless of whether
    millisecond precision has been enabled or not.

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- Update to version 1.9.0
  * Added decoder for ISO 8650 / X.227 Association Control Service
    (ACSE).
  * Improved decoder for ISO 8327 / X.225 Session Protocol.
  * Restructured code of ATN applications decoder. The previous
    implementation was a little messy and was unable to handle a
    few uncommon types of messages (like ACSE Abort PDU with no
    payload). This should bring the number of undecoded ATN
    messages down to zero.
  * Enable debugging output from SDRPlay driver only if
    --debug sdr option is used.
  * Fix formatting of geo coordinates in ADS-C v2 messages.

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- Update to version 1.8.2
  * Fix another crash opportunity due to missing sanity check on
    unparseable ACARS messages.
  * Fix ACARS output to Planeplotter. Only first three characters
    of Message Serial Number (MSN) field were sent instead of all
    four.

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- Update to version 1.8.1
  * Fix a bug where an unparseable ACARS message could cause the
    program to crash.

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- Update to version 1.8.0
  * Support for ATN-B2 Automatic Dependent Surveillance-Contract
    (ADS-C) version 2.
  * Support for automatic reassembly of multiblock ACARS messages,
    MIAM file transfers and fragmented X.25 packets. Contents of
    reassembled messages is now logged in one piece and passed
    upwards to decoders of higher layer protocols / applications.
    Thanks to this, many large messages which so far were decoded
    partially and logged with "Unparseable ... PDU" errors due to
    fragmentation, are now decoded correctly.
  * StatsD metrics for monitoring reassembly engine performance
    have been added.
  * Logged messages may be enriched with ground stations details
    read from a text file in MultiPSK GS format. Look up --gs-file
    and --addrinfo options in README.md and dumpvdl2 usage text for
    more details.
  * Logged messages may be enriched with aircraft details read from
    a Basestation SQLite database. SQLite3 library must be installed
    prior to compiling dumpvdl2 in order for this feature to be
    enabled. Look up --bs-db and --addrinfo options in README.md and
    dumpvdl2 usage text for more details. Database entries are
    cached in memory. There are new StatsD metrics for monitoring
    performance and utilization of the cache.
  * New --prettify-xml option enables pretty-printing of XML
    documents carried in ACARS and MIAM CORE messages. The purpose
    is to improve readability. If enabled, XML content will be
    printed as multiline text with proper indentation.  This
    requires libacars built with libxml2 support.
  * ACARS sublabel and MFI fields are now stripped from message text
    and logged as separate fields (if present).

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- Update to version 1.7.1
  * Fixed an issue where a truncated or corrupted ICAO APDU could
    cause a crash in ASN.1 decoder.
  * Fixed an issue where NULL characters in XID attribute values
    could cause them do be printed partially. Any non-printable
    characters in octet strings printed as text are now replaced
    with periods.

- Update to version 1.7.0
  * Complete overhaul of output generation code.
  * Significant enhancements to CLNP, COTP and IDRP decoders.
    Most if not all protocol headers are now decoded and included
    in the output.
  * Added a decoder for X.225 Session Protocol SPDUs.
  * Added a decoder for VDL SNDCF error reports.
  * XID: improved decoding of XID sequencing, Frequency support
    and System mask attributes.
  * X.25: improved decoding of facility fields, call clearing
    causes and diagnostic codes.
  * Minor bug fixes.

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- Update to version 1.6.0
  * New build system based on cmake.
  * FANS/1-A CPDLC, ADS-C and ACARS decoders have been removed.
    These features have been moved to libacars library, which is
    now a mandatory dependency
  * Added support for SoapySDR library. However there are still
    some limitations with respect to SDR types which dumpvdl2
    can work with. As of now, the device must support a sampling
    rate of 2100000 samples per second. This will be addressed in
    a future release.
  * Minor bugfixes

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