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Table of Contents

FIX Antenna HFT 1.0.16 - Release Notes

FIX Antenna HFT 1.0.16 released on 27th of February 2024

New Features and Improvements

  • A new audit trail tool has been introduced to satisfy the requirements for CME iLink 3 certification.
  • LiteFixMessage now allows for tags with numbers higher than 65535.
  • The logs converter tool has been updated to support CME MDP 3 and BrokerTec protocols.
  • Users can now substitute the default iLink 3 binary parser with a custom parser implementation.
  • FIX Antenna HFT can now handle several FIX sessions with the same SenderCompID and TargetCompID by using the FIXCompIdCutoffMarker property.
  • Added ability to set iLink 3 SendingTimeEpoch automatically for the messages that support it.
  • Introduced the ability to measure latency before data is sent through the socket and comprehensive measurement of full processing latency while sending.

Critical bugs and fixes:

  • FIX Antenna HFT has been fixed to allow for the establishment of a FIX session when connected to CME BrokerTec.
  • A segmentation fault caused by the UseTCPDispatcher property being set to 'true' and receiving incomplete initial FIX message data is now resolved.
  • The iLink3_logs_converter now correctly populates audit fields (6, 28) for Order Cancel or Cancel Replace Reject messages.

FIX Antenna HFT 1.0.14 - FA 2.9.53 Release Notes


  • Added support of iLink3 binary protocol v7. Details can be found at iLink3 support guide page .
  • Added iLink3 binary logs to FIX/ HumanReadable converter available as sample.
  • Added CME Audit Trail report generation tool available as sample.


  • Library for platform RHEL 6 using C++ 98 ABI is deprecated and will be removed from the package starting next release

  • Restored FIX-Protocol compatibility when a session is terminated if re-transmitted GapFill (35=4) message does not have PossDup flag (43=Y).
    The previous behavior can be enabled with the following configuration set:

    Code Block
    AllowMessageWithoutPossDupFlag = true
    AllowGapFillWithoutPossDupFlag = true

  • Rejected messages are not filtered out and replaced with gap-fill messages in resend request replies.

    The counterparty now is responsible for increment sequence numbers in case of rejecting invalid messages in order to prevent endless resending.

  • Changed naming convention → 

    The C++11 ABI is compatible with GCC 5.x and above so library can be used with any GGC newer 5.1.

    The libraries and are considered as depreciated. Support C98 Standard and Red Hat 6 platform will be discontinued in one of the next releases.

  • (SD4906754)  Engine::SessionsManager::onIncomingConnection callback API has been extended with delivering the port number for accepted connection.


    The method signature was changed. User's application modification is required.



  • (SD4998782) Fixed a bug when the engine can try to close random file descriptors at destroying.
  • Fixed a bug when the engine stops sending heartbeats to all sessions if one session is locked e.g. due to long processing of the resend request message.
  • Fixed a bug when any resend requests processing takes too much time (several seconds) on the large FIX-messages storages (about 10 GB).

Logging improvements:

  • (SD4906754) A log record about incoming connection event has been extended with ip and port that have accepted the connection

    text has been changed:

    Previous message

    <severity> <timestamp> <thread> [Engine] - New incoming connection was detected (from <target ip>:<target port>).

    Current message

    <severity> <timestamp> <thread> [Engine] - New incoming connection was detected (from <target ip>:<target port> to <local ip>:<local port>).


  • New Incoming connection event is raised on any small amount of received data (e.g. even 1 byte)
  • OpenOnload accelerated dispatcher and standard dispatcher act differently if an incoming invalid message has sequence lower than expected. Standard dispatcher disconnects sessions according to FIX-protocol recommendations but OpenOnload accelerated dispatcher keeps the session alive. 


New Features and Improvements:

The following bugs have been fixed:


The following bugs have been fixed:

  • TCP reader stops reading in some cases on receiving new connection
  • Milliseconds are truncated after serialization for fields with types UTCTimestamp and UTCTimeOnly when milliseconds value is 000

FIX Antenna HFT 1.0.7 Release Notes