Each FIXP session is represented with a unique 64-bit identifier (the sessionVerId field). Its value must be incremented each time the Negotiate message is sent to the gateway.

The OnixS::B3::BOE::Session automatically generates the sessionVerId in the following cases:

A new OnixS::B3::BOE::Session object is created, and the value from the previous run cannot be restored from the session storage.
The OnixS::B3::BOE::Session::reset method is called.

One can pass a sessionVerId value manually to the OnixS::B3::BOE::Session::Session constructor.

To read the sessionVerId value, use the OnixS::B3::BOE::Session::sessionVerId() const method.

For example:

 
std::clog << session.sessionVerId() << std::endl;
 

Re-setting sessionVerId

To reset the sessionVerId intra-session on the same trading day, use the OnixS::B3::BOE::Session::reset() method.

Note: The OnixS::B3::BOE::Session::reset method can be called only when the session is disconnected.

See also: Restoring Session State; Scheduling Sessions for Automatic Connection