...

The Whisperer Direct interface is founded on the Simple Binary Encoding (SBE) messaging protocol using a simple primitive encoding, and is optimized for low bandwidth, low latency and direct data access.

Whisperer  Whisperer Direct differs from Classic in that there is no API server. Instead all client connections are arbitrated by a single logon service which then Logon Service that hands-off the connection to the relevant Feed Handler, which then communicates directly with the client thereafter for all session types.

...

For detailed information relating to the changes, please refer to Whisperer Direct vs Whisperer Classic.

Getting Started

For optimal performance, a tool such as Real-Logic's  SBE tool should be used against the MFSBE4 Message Whisperer Direct SBE Schema to generate compilable stubs to support the direct encoding or decoding of messages in the client application.

...