RTSDK C/C++ Installation Guide : 5 Package Directory Changes : 5.3 Starting in Version 1.5.0
 
5.3 Starting in Version 1.5.0
RTSDK supports a WebSocket Transport and introduces support for either a RWF or JSON payload. Conversion from RWF to JSON (and from JSON to RWF) is built into librssl and also available as a separate shared library.