ResetSeqNumFlag (141) field in the Logon (A) message indicates that both sides of the FIX Session should reset sequence numbers.

To send a Logon (A) message with this field during FIX Connection establishment, use the setResetSeqNumFlag parameter of the OnixS::FIX::Session::logonAsInitiator method.

It is also possible to send a Logon (A) message with the ResetSeqNumFlag (141) set when the FIX Session is established (e.g. to maintain 24 hour connectivity) using OnixS::FIX::Session::resetSeqNumViaLogonExchange method.